OPPENHEIMER INTEGRITY FUNDS
497, 1998-04-17
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                 OPPENHEIMER LIFESPAN INCOME FUND
      Two World Trade Center, New York, New York  10048-0203
                          1-800-525-7048

             NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                    TO BE HELD ON JUNE 9, 1998

To the Shareholders of Oppenheimer LifeSpan Income Fund:

Notice is hereby given that a Special Meeting of the Shareholders of Oppenheimer
LifeSpan Income Fund ("LifeSpan  Income Fund"),  a series of Oppenheimer  Series
Fund, Inc., a registered  management  investment  company,  will be held at 6803
South Tucson Way, Englewood,  Colorado 80112 at 10:00 A.M., Denver time, on June
9,  1998,  or any  adjournments  thereof  (the  "Meeting"),  for  the  following
purposes:

1. To approve or  disapprove  an Agreement  and Plan of  Reorganization  between
LifeSpan  Income  Fund  and   Oppenheimer   Bond  Fund  ("Bond  Fund")  and  the
transactions  contemplated thereby,  including (a) the transfer of substantially
all the assets of LifeSpan Income Fund to Bond Fund in exchange for Class A,
Class B
and Class C shares of Bond  Fund,  (b) the  distribution  of such  shares to the
Class A, Class B and Class C  shareholders  of LifeSpan  Income Fund in complete
liquidation of LifeSpan Income Fund, and (c) the cancellation of the outstanding
shares of LifeSpan Income Fund (the "Proposal" or the "Reorganization").

2. To act upon such other matters as may properly come before the
Meeting.

Shareholders  of record at the close of business on March 17, 1998 are  entitled
to notice of, and to vote at, the Meeting.  The Proposal is more fully discussed
in the Proxy Statement and Prospectus.  Please read it carefully  before telling
us,  through  your  proxy or in  person,  how you wish your  shares to be voted.
LifeSpan  Income  Fund's  Board of  Directors  recommends a vote in favor of the
Proposal. WE URGE YOU TO SIGN, DATE AND MAIL THE ENCLOSED PROXY PROMPTLY.

By Order of the Board of Directors,


Andrew J. Donohue, Secretary

April 6, 1998
- -----------------------------------------------------------------
Shareholders  who do not expect to attend the Meeting are  requested to indicate
voting instructions on the enclosed proxy and to date, sign and return it in the
accompanying  postage-paid envelope. To avoid unnecessary duplicate mailings, we
ask your cooperation in promptly mailing your proxy no matter how large or small
your holdings may be.



<PAGE>



                 OPPENHEIMER LIFESPAN INCOME FUND
       Two World Trade Center, New York, New York 10048-0203
                          1-800-525-7048

                          PROXY STATEMENT

                       OPPENHEIMER BOND FUND
            6803 South Tucson Way, Englewood, CO 80112
                          1-800-525-7048

                            PROSPECTUS

This Proxy  Statement of  Oppenheimer  LifeSpan  Income Fund  ("LifeSpan  Income
Fund") relates to the Agreement and Plan of Reorganization (the  "Reorganization
Agreement")and  the  transactions  contemplated  thereby (the  "Reorganization")
between  LifeSpan  Income Fund and  Oppenheimer  Bond Fund ("Bond  Fund").  This
document also  constitutes a Prospectus of Bond Fund included in a  Registration
Statement on Form N-14 filed by  Oppenheimer  Bond Fund with the  Securities and
Exchange  Commission (the "SEC").  Such  Registration  Statement  relates to the
registration  of  shares  of Bond  Fund to be  offered  to the  shareholders  of
LifeSpan Income Fund pursuant to the Reorganization  Agreement.  LifeSpan Income
Fund is  located  at Two  World  Trade  Center,  New York,  New York  10048-0203
(telephone 1-800- 525-7048).

This Proxy Statement and Prospectus sets forth  information  about Bond Fund and
the Reorganization  that shareholders of LifeSpan Income Fund should know before
voting on the  Reorganization.  A copy of the  Prospectus  for Bond Fund,  dated
April 30, 1997, is enclosed, and incorporated herein by reference. The following
documents  have been filed with the SEC and are  available  without  charge upon
written  request to  OppenheimerFunds  Services,  the transfer  and  shareholder
servicing  agent for Bond  Fund and  LifeSpan  Income  Fund,  at P.O.  Box 5270,
Denver,  Colorado 80217, or by calling the toll-free  number shown above:  (i) a
Prospectus for LifeSpan Income Fund, dated February 19, 1998, as supplemented on
February 24, 1998 (ii) a Statement of Additional Information for LifeSpan Income
Fund,  dated February 19, 1998, and (iii) a Statement of Additional  Information
for Bond Fund,  dated April 30,  1997.  A Statement  of  Additional  Information
relating to the  Reorganization,  dated April 6, 1998 (the "Bond Fund Additional
Statement")  which is  incorporated  herein by reference and which contains more
detailed information about Bond Fund and its management, has been filed with the
SEC as part  of the  Bond  Fund  Registration  Statement  on  Form  N-14  and is
available by written  request to  OppenheimerFunds  Services at the same address
listed above or by calling the toll-free number shown above.

Investors  are  advised  to read and retain  this  Proxy  Statement
and
Prospectus for future reference.



<PAGE>



THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
SECURITIES   AND  EXCHANGE   COMMISSION   NOR  HAS  THE  COMMISSION
PASSED ON
THE    ACCURACY    OR   ADEQUACY    OF   THIS    PROSPECTUS.    ANY
REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.


This Proxy Statement and Prospectus is dated April 6, 1998




<PAGE>



                         TABLE OF CONTENTS
                  PROXY STATEMENT AND PROSPECTUS
                                                            Page
Introduction...................................................
   General....................................................1
   Record Date; Vote Required; Share Information..............2
   Proxies....................................................4
   Costs of the Solicitation and the Reorganization...........5
Comparative Fee Tables........................................5
Synopsis......................................................9
   Parties to the Reorganization..............................9
   Shares to be Issued.......................................10
   The Reorganization      ..................................10
   Reasons for the Reorganization............................11
   Tax Consequences of the Reorganization....................11
   Investment Objectives and Policies........................11
   Investment Advisory and Distribution and Service Plan Fees..
   Purchases, Exchanges and Redemptions......................12
Principal Risk Factors.......................................13
Approval of the Reorganization (The Proposal)................16
   Reasons for the Reorganization............................16
   The Reorganization........................................18
   Tax Aspects of the Reorganization.........................19
   Capitalization Table (Unaudited)..........................21
Comparison Between LifeSpan Income Fund and
Bond Fund
   Investment Objectives and Policies........................22
   Permitted Investments By Both LifeSpan Income Fund
     and Bond Fund...........................................23
   Investment Restrictions...................................32
   Description of Brokerage Practices........................34
   Expense Ratios and Performance............................35
   Shareholder Services......................................35
   Rights of Shareholders....................................36
   Organization and History..................................38
   Management and Distribution Arrangements..................38
   Purchase of Additional Shares.............................40
   Dividends and Distributions...............................41
Method of Carrying Out the Reorganization ...................42
Additional Information.......................................44
   Financial Information.....................................44
   Public Information........................................44
Other Business...............................................45
Exhibit A - Agreement and Plan of Reorganization by and between
LifeSpan Income Fund and Bond Fund..........................A-1
Exhibit B - Average Annual Total Returns for the Period
Ended  12/31/97.............................................B-1


<PAGE>



                 OPPENHEIMER LIFESPAN INCOME FUND
       Two World Trade Center, New York, New York 10048-0203
                          1-800-525-7048

                          PROXY STATEMENT

                       Oppenheimer Bond Fund
                       6803 South Tucson Way
                        Englewood, CO 80112
                          1-800-525-7048

                            PROSPECTUS

                  Special Meeting of Shareholders
                      to be held June 9, 1998

                           INTRODUCTION

General

This Proxy  Statement and Prospectus is being  furnished to the  shareholders of
Oppenheimer   LifeSpan  Income   Fund("LifeSpan   Income  Fund"),  a  series  of
Oppenheimer  Series  Fund,  Inc.  (the  "Company"),   a  registered   management
investment  company,  in  connection  with  the  solicitation  by the  Board  of
Directors  (the  "Board")  of  proxies  to be used  at the  Special  Meeting  of
Shareholders  of  LifeSpan  Income  Fund to be held at 6803  South  Tucson  Way,
Englewood,  Colorado 80112, at 10:00 A.M.,  Denver time, on June 9, 1998, or any
adjournments  thereof (the  "Meeting").  It is expected that the mailing of this
Proxy Statement and Prospectus will commence on or about April 14, 1998.

At the Meeting, shareholders of LifeSpan Income Fund will be asked to approve an
Agreement and Plan of Reorganization  (the  "Reorganization  Agreement") between
the Company on behalf of LifeSpan  Income Fund and  Oppenheimer  Integrity Funds
(the  "Trust")  on  behalf  of  Oppenheimer  Bond Fund  ("Bond  Fund"),  and the
transactions  contemplated  thereby  including (a) the transfer of substantially
all the assets of LifeSpan  Income  Fund to Bond Fund in  exchange  for Class A,
Class B and Class C shares of Bond Fund, (b) the  distribution of such shares to
the  Class A,  Class B and  Class C  shareholders  of  LifeSpan  Income  Fund in
complete  liquidation of LifeSpan  Income Fund, and (c) the  cancellation of the
outstanding   shares  of   LifeSpan   Income   Fund  (the   "Proposal"   or  the
"Reorganization").

Bond Fund  currently  offers Class A shares with a sales  charge  imposed at the
time of  purchase.  There is no initial  sales charge on purchases of Class B or
Class C shares;  however,  a  contingent  deferred  sales charge may be imposed,
depending  on when the shares are sold.  The Class A, Class B and Class C shares
issued pursuant to the Reorganization  will be issued at net asset value without
a

                                -1-

<PAGE>



sales  charge and no  contingent  deferred  sales  charge will be imposed on any
LifeSpan  Income Fund  shares  exchanged  in the  Reorganization.  However,  any
contingent  deferred  sales charge which applies to LifeSpan  Income Fund shares
will  continue  to apply to Bond Fund  shares  received  in the  reorganization.
Additional  information  with respect to these charges by Bond Fund is set forth
herein,  in the Prospectus of Bond Fund  accompanying  this Proxy  Statement and
Prospectus  and in the Bond Fund  Statement of Additional  Information,  both of
which are incorporated herein by reference.

Commencing  on or about April 17,  1998,  Bond Fund will offer Class Y shares to
certain  institutional   investors  that  have  special  arrangements  with  the
Distributor.  Bond Fund's Class Y shares are not offered to LifeSpan Income Fund
shareholders  in this proxy  statement and prospectus nor is any  description of
them included herein.

Record Date; Vote Required; Share Information

The Board of  Directors  of the Company has fixed the close of business on March
17,  1998 as the  record  date (the  "Record  Date")  for the  determination  of
shareholders  entitled to notice of, and to vote at, the Meeting. An affirmative
vote of the holders of a "majority  of the  outstanding  voting  securities"  as
defined in the  Investment  Company  Act of 1940,  as amended  (the  "Investment
Company Act") of all of the Class A, Class B and Class C shares in the aggregate
of LifeSpan Income Fund is required to approve the Reorganization. That level of
vote is defined in the Investment  Company Act as the vote of the holders of the
lesser of: (i) 67% or more of the voting  securities  present or  represented by
proxy  at the  shareholders  meeting,  if the  holders  of more  than 50% of the
outstanding  voting securities are present or represented by proxy, or (ii) more
than 50% of the outstanding voting securities. Each shareholder will be entitled
to one vote for each share and a fractional vote for each fractional  share held
of record at the close of  business on the Record  Date.  Only  shareholders  of
LifeSpan Income Fund will vote on the  Reorganization.  The vote of shareholders
of Bond Fund is not being solicited.

At the close of business on the Record Date, there were 2,807,518.761  shares of
LifeSpan Income Fund issued and outstanding, consisting of 2,719,106.304 Class A
shares,  80,784.497 Class B shares and 7,627.960 Class C shares. At the close of
business  on the  Record  Date,  there were  23,635,082.256  shares of Bond Fund
issued  and   outstanding,   consisting  of   17,688,130.448   Class  A  shares,
4,918,437.965  Class B shares and 1,028,513.843  Class C shares. The presence in
person or by proxy of the  holders  of a majority  of the shares of all  classes
constitutes  a quorum for the  transaction  of business at the  Meeting.  To the
knowledge of LifeSpan Income Fund, as of the Record Date, no person owned of

                                -2-

<PAGE>



record or  beneficially  owned 5% or more of its  outstanding  shares except for
MML,  1295 State  Street,  Springfield,  MA  01111-0001,  which  owned of record
2,411,090.544  Class A shares of LifeSpan Income Fund as of such date (88.67% of
the outstanding  Class A shares of LifeSpan  Income Fund);  Bank of Boston Trust
Rollover IRA For The Benefit Of Kathy R. Simkins,  314 W. 1700 S, Orem VT 84058-
7542, which owned of record 11,771.850 Class B shares of LifeSpan Income Fund as
of such date (14.57% of the outstanding Class B shares of LifeSpan Income Fund),
Bank of Boston  Trust IRA For The Benefit Of Frances L.  Barnes;  Harriman  Hill
Road,  P.O. Box 362,  Raymond,  NH 03077-0362,  which owned of record  5,597.535
Class B shares of LifeSpan Income Fund as of such date (6.92% of the outstanding
Class B  shares  of  LifeSpan  Income  Fund);  Davie E. & Gail M.  Tilton  Joint
Revocable  Trust,  34 Wawayanda  Road,  Warwick,  NY 10990-3339,  which owned of
record  5,300.664  Class B shares of LifeSpan Income Fund as of such date (6.56%
of the  outstanding  Class B shares of  LifeSpan  Income  Fund);  Bank of Boston
Custodian  403-B Plan For The  Benefit Of Mildred H.  Macnaughton,  507  Serrill
Drive, Hatboro, PA 19040-1420, which owned of record 2,502.937 Class C shares of
LifeSpan Income Fund as of such date (32.81% of the  outstanding  Class C shares
of LifeSpan Income Fund);  Beverly A. Filla Trust,  Filla  Irrevocable Trust For
The  Benefit Of  Elizabeth  Lynn Filla,  405  Bethany  Court,  Valley  Park,  MO
63088-2307,  which owned of record  1,004.378  Class C shares of LifeSpan Income
Fund as of such date  (13.16%  of the  outstanding  Class C shares  of  LifeSpan
Income  Fund);  Norman I.  Bobczynski,  189  Leeward  Avenue,  Pismo  Beach,  CA
93449-2017,  who owned of record 901.169 Class C shares of LifeSpan  Income Fund
as of such date  (11.81% of the  outstanding  Class C shares of LifeSpan  Income
Fund); Laura M. Simmons, 718 N. Greece Road, Rochester, NY 14626-1025, who owned
of record 724.522 Class C shares of LifeSpan  Income Fund as of such date (9.49%
of the outstanding Class C shares of LifeSpan Income Fund); Bank of Boston Trust
Account For Paula Rosenstein SEP IRA For The Benefit Of Paula  Rosenstein,  4756
Biona Drive,  San Diego,  CA  92116-2530,  which owned of record 626.307 Class C
shares of LifeSpan Income Fund as of such date (8.21% of the outstanding Class C
shares of LifeSpan Income Fund);  National Financial Securities  Corporation For
The Exclusive  Benefit of Phillip S. Shapiro and Ruth A. Shapiro,  102 Claybrook
Drive, Silver Springs, MD 20902, which owned of record 497.513 Class C shares of
LifeSpan Income Fund as of such date (6.52% of the outstanding Class C shares of
LifeSpan  Income Fund) and Bank of Boston Trust  Rollover IRA For The Benefit Of
Robin R. Prafke,  P.O. Box 88, New Auburn, MN 55366-0088,  which owned of record
444.257  Class C shares of  LifeSpan  Income  Fund as of such date (5.82% of the
outstanding  Class C shares of LifeSpan  Income Fund). As of the Record Date, to
the knowledge of Bond Fund, no person owned of record or  beneficially  owned 5%
or more of its  outstanding  shares  except for Merrill  Lynch  Pierce  Fenner &
Smith,  Inc.  ("Merrill   Lynch"),   4800  Deer  Lake  Drive  East,  3rd  Floor,
Jacksonville, FL 32246-6484, which owned of record 424,188.685 Class B shares of
Bond  Fund as of such  date  (8.61%  of the  outstanding  Class B shares of Bond
Fund);  Merrill Lynch Pierce Fenner & Smith, Inc. ("Merrill  Lynch"),  4800 Deer
Lake Drive East,

                                -3-

<PAGE>



3rd Floor, Jacksonville,  FL 32246-6484, which owned of record 223,881.222 Class
C shares of Bond Fund as of such date (21.80% of the outstanding  Class C shares
of LifeSpan  Income  Fund).  The Manager has been  advised that such shares were
held by Merrill  Lynch for the sole benefit of their  respective  customers.  In
addition,  as of the Record Date, the Directors and officers of LifeSpan  Income
Fund and the  Trustees  and  Officers  of Bond  Fund  owned  less than 1% of the
outstanding shares of either LifeSpan Income Fund or Bond Fund, respectively.

Massachusetts  Mutual Life Insurance  Company,  the majority  shareholder of the
Fund, intends to vote its shares in favor of the
Reorganization.

Proxies

The enclosed form of proxy, if properly executed and returned, will be voted (or
counted as an abstention or withheld from voting) in accordance with the choices
specified thereon,  and will be included in determining  whether there is quorum
to conduct the Meeting.  The proxy will be voted in favor of the Proposal unless
a choice is indicated to vote against or to abstain from voting on the Proposal.

Shares  owned of record by  broker-dealers  for the  benefit of their  customers
("street  account  shares")  will  be  voted  by  the  broker-dealer   based  on
instructions received from its customers.  If no instructions are received,  the
broker-dealer  may (if permitted  under  applicable  stock exchange  rules),  as
record holder,  vote such shares on the Proposal in the same  proportion as that
broker-dealer  votes street  account shares for which voting  instructions  were
received in time to be voted.  Broker  "non-votes"  exist where a proxy received
from a broker indicates that the broker does not have discretionary authority to
vote  the  shares  on the  matter.  Shares  represented  in  person  or by proxy
(including shares which abstain or do not vote on the Proposal, including broker
"non- votes") will be counted for purposes of  determining  the number of shares
that are  present  and are  entitled  to vote on the  Proposal,  but will not be
counted as a vote in favor of such  Proposal.  Accordingly,  an abstention  from
voting on the Proposal or a broker "non-vote" will have the same legal effect as
a vote against the Proposal.  If a shareholder  executes and returns a proxy but
fails to indicate how the votes should be cast, the proxy will be voted in favor
of the  Proposal.  The  proxy may be  revoked  at any time  prior to the  voting
thereof by: (i) writing to the  Secretary  of LifeSpan  Income Fund at Two World
Trade Center,  New York,  New York  10048-0203  (if received in time to be acted
upon);  (ii)  attending  the Meeting and voting in person;  or (iii) signing and
returning a new proxy (if returned and received in time to be voted).

If at the time any session of the Meeting is called to order a

                                -4-

<PAGE>



quorum is not present,  in person or by proxy,  the persons named as proxies may
vote those  proxies  which have been  received to adjourn the Meeting to a later
date. In the event that a quorum is present but sufficient votes in favor of the
Proposal have not been received, the persons named as proxies may propose one or
more adjournments of the Meeting to permit further  solicitation of proxies. All
such  adjournments will require the affirmative vote of a majority of the shares
present in person or by proxy at the session of the Meeting to be adjourned. The
persons named as proxies will vote those proxies which they are entitled to vote
in favor of the Proposal,  in favor of such an adjournment,  and will vote those
proxies required to be voted against the Proposal, against any such adjournment.
A vote may be taken on the  Proposal in this proxy  statement  prior to any such
adjournment  if  sufficient  votes for its approval have been received and it is
otherwise  appropriate.  Any adjourned session or sessions may be held within 90
days  after the date set for the  original  Meeting  without  the  necessity  of
further notice.


Costs of the Solicitation and the Reorganization

All expenses of this  solicitation,  including  the cost of printing and mailing
this Proxy Statement and Prospectus,  will be borne by LifeSpan Income Fund. Any
documents such as existing  prospectuses  or annual reports that are included in
that mailing will be a cost of the Fund issuing the document. In addition to the
solicitation  of  proxies by mail,  proxies  may be  solicited  by  officers  of
LifeSpan  Income Fund or officers and  employees of  OppenheimerFunds  Services,
personally or by telephone or telegraph;  any expenses so incurred will be borne
by  OppenheimerFunds  Services.  Proxies  may  also  be  solicited  by  a  proxy
solicitation  firm hired at LifeSpan  Income  Fund's  expense for such  purpose.
Brokerage  houses,  banks and other  fiduciaries  may be  requested  to  forward
soliciting  material to the beneficial  owners of shares of LifeSpan Income Fund
and to obtain authorization for the execution of proxies. For those services, if
any,  they will be  reimbursed  by  LifeSpan  Income  Fund for their  reasonable
out-of-pocket expenses.

With respect to the Reorganization, LifeSpan Income Fund and Bond Fund will bear
equally  the cost of the tax  opinions.  Any  other  out-of-pocket  expenses  of
LifeSpan Income Fund and Bond Fund associated with the Reorganization, including
legal,  accounting and transfer agent expenses, will be borne by LifeSpan Income
Fund and Bond Fund, respectively, in the amounts so incurred by each.

                      COMPARATIVE FEE TABLES

Shareholder Transaction Expenses.  LifeSpan Income Fund and Bond
Fund  each  pay a  variety  of  expenses  for  management  of their
assets,
administration, distribution of their shares and other services,

                                -5-

<PAGE>



and those  expenses  are  reflected  in each  Fund's net asset  value per share.
Shareholders pay other expenses directly,  such as sales charges.  The following
table is provided to help you compare the direct  expenses of  investing in each
class of either LifeSpan Income Fund, Bond Fund or the surviving Bond Fund after
giving effect to the Reorganization.

LifeSpan Income Fund
Shareholder Transaction Expenses

                          Class A       Class B         Class C
                          Shares        Shares          Shares


Maximum Sales Charge      5.75%         None            None
on Purchases
(as a % of
offering price)

Maximum                   None(1)       5% in the       1% if
Deferred Sales     `                    first year      shares are
Charge (as a %                          declining to    redeemed
of the lower of the                     1% in the       within 12
original offering price                 sixth year and  months of
or redemption proceeds)                 eliminated      purchase(2)
                                        thereafter(2)

Maximum Sales Charge
on Reinvested Dividends   None          None            None

Exchange Fee              None          None            None

Redemption Fee            None(3)       None(3)         None(3)



Bond Fund and Bond Fund as Surviving Fund
Shareholder Transaction Expenses

                          Class A       Class B         Class C
                          Shares        Shares          Shares


Maximum Sales Charge      4.75%         None            None
on Purchases
(as a % of
offering price)

Maximum                   None(1)       5% in the       1% if
Deferred Sales     `                    first year      shares are
Charge (as a %                          declining to    redeemed
of the lower of the                     1% in the       within 12
original offering price                 sixth year and  months of
or redemption proceeds)                 eliminated      purchase(2)
                                        thereafter(2)

Maximum Sales Charge
on Reinvested Dividends   None          None            None


                                -6-

<PAGE>



Exchange Fee              None          None            None

Redemption Fee            None(3)       None(3)         None(3)

(1) If you  invest  more than $1  million  ($500,000  or more for  purchases  by
"Retirement  Plans," as defined in "Class A Contingent Deferred Sales Charge" in
each Fund's Prospectus) in Class A shares, you may have to pay a sales charge of
up to 1% if you sell your shares within 12 calendar months (18 months for shares
purchased  prior to May 1,  1997)from the end of the calendar month during which
you purchased those shares.

(2) See "How to Buy  Shares - Buying  Class B Shares"  and "How to Buy  Shares -
Buying Class C Shares" in each Fund's Prospectus.

(3) There is a $10 transaction fee for redemption  proceeds paid by Federal Fund
wire,  but not for  redemptions  paid by check or by ACH wire  transfer  through
AccountLink, or, in the case of Bond Fund, for which checkwriting privileges are
used (see "How to Sell Shares").

Annual Fund Operating Expenses.  The following tables are the operating expenses
of Class A, Class B and Class C shares of LifeSpan Income Fund and the operating
expenses of Class A, Class B and Class C shares of Bond Fund. These are based on
expenses  for the twelve month  period  ended  December  31,  1997.  The expense
numbers for LifeSpan Income Fund are unaudited.  The pro forma information is an
estimate of the business expenses of the surviving Bond Fund after giving effect
to the Reorganization.  All amounts shown are a percentage of net assets of each
class of each of the Funds.

                         LifeSpan Income Fund* Bond Fund
                 Class A Class B Class C Class A Class B Class C


Management Fees      0.75%  0.75%     0.75%    0.75%    0.75%    0.75%
12b-1 Plan Fees      0.25%  1.00%     1.00%    0.25%    1.00%    1.00%
Other Expenses       0.32%  0.33%     0.39%    0.27%    0.27%    0.27%
Total Fund Operating 1.32%  2.08%     2.14%    1.27%    2.02%    2.02%
 Expenses
                          Pro Forma Surviving Bond Fund
                        Class A       Class B      Class C

Management Fees         0.74%         0.74%        0.74%
12b-1 Plan Fees         0.25%         1.00%        1.00%
Other Expenses          0.27%         0.26%        0.26%
Total Fund Operating    1.26%         2.00%        2.00%
  Expenses

- -----------------
* Unaudited

The  12b-1  fees for Class A shares of  LifeSpan  Income  Fund and Bond Fund are
service plan fees. The service plan fees are a maximum of

                                -7-

<PAGE>



0.25% of average  annual  net  assets of Class A shares of each Fund.  The 12b-1
fees for Class B and Class C shares  of each of the Funds are  Distribution  and
Service Plan fees which include a service fee of 0.25% and an asset-based  sales
charge of 0.75%.

Examples. To try and show the effect of the expenses on an investment over time,
the hypothetical examples shown below have been created.  Assume that you make a
$1,000  investment  in Class A,  Class B and Class C shares of  LifeSpan  Income
Fund,  or Class A, Class B and Class C shares of Bond Fund,  or Class A, Class B
and  Class C shares  of the pro forma  surviving  Bond Fund and that the  annual
return is 5% and that the operating expenses for each Fund are the ones shown in
the chart  above.  If you were to redeem  your  shares at the end of each period
shown below,  your investment  would incur the following  expenses by the end of
each period shown.

                            1 year   3 years   5 years   10 years*

LifeSpan Income Fund
     Class A Shares         $70      $97       $126      $207
     Class B Shares         $71      $95       $132      $204
     Class C Shares         $32      $67       $115      $247

Bond Fund
     Class A Shares         $60      $86       $114      $194
     Class B Shares         $71      $93       $129      $198
     Class C Shares         $31      $63       $109      $235

Pro Forma Surviving
Bond Fund
     Class A Shares         $60      $86       $113      $193
     Class B Shares         $70      $93       $128      $196
     Class C Shares         $30      $63       $108      $233

If  you  did  not  redeem  your  investment,  it  would  incur  the
following
expenses:

                            1 year   3 years   5 years   10 years*


LifeSpan Income Fund
     Class A Shares         $70      $97       $126      $207
     Class B Shares         $21      $65       $112      $204
     Class C Shares         $22      $67       $115      $247

Bond Fund
     Class A Shares         $60      $86       $114      $194
     Class B Shares         $21      $63       $109      $198
     Class C Shares         $21      $63       $109      $235

Pro Forma Surviving

                                -8-

<PAGE>



Bond Fund
     Class A Shares         $60      $86       $113      $193
     Class B Shares         $20      $63       $108      $196
     Class C Shares         $20      $63       $108      $233

* In the first  example,  expenses  include the Class A initial sales charge and
the  applicable  Class B or Class C contingent  deferred  sales  charge.  In the
second example,  Class A expenses include the initial sales charge,  but Class B
and Class C expenses do not include contingent deferred sales charges. The Class
B expenses in years 7 through 10 are based on the Class A expenses  shown above,
because each of the Funds automatically  converts your Class B shares into Class
A shares  after 6 years.  Long  term  Class B and C  shareholders  could pay the
economic  equivalent  of more than the maximum  front-end  sales charge  allowed
under  applicable  regulations,  because of the effect of the asset-based  sales
charge and contingent deferred sales charge. The automatic conversion of Class B
shares to Class A shares is designed to minimize the  likelihood  that this will
occur.

The examples show the effect of expenses on an investment,  but are not meant to
state or predict  actual or expected  costs or investment  returns of the Funds,
all of which may be more or less
than the amounts shown.

                             SYNOPSIS

The following is a synopsis of certain information  contained in or incorporated
by  reference  in  this  Proxy   Statement  and   Prospectus  and  presents  key
considerations  for  shareholders  of  LifeSpan  Income  Fund to assist  them in
determining  whether to approve  the  Reorganization.  This  synopsis  is only a
summary  and is  qualified  in its  entirety  by the more  detailed  information
contained in or incorporated by reference in this Proxy Statement and Prospectus
and by the  Reorganization  Agreement,  a copy of which is attached as Exhibit A
hereto. Shareholders should carefully review this Proxy Statement and Prospectus
and the  Reorganization  Agreement in their  entirety  and, in  particular,  the
current  Prospectus  of Bond Fund which  accompanies  this Proxy  Statement  and
Prospectus and is incorporated herein by reference.

Parties to the Reorganization

Oppenheimer Series Fund, Inc. (defined above as the Company) was
organized in 1981 as a multi-series Maryland corporation which
currently  has five  series.  The  Company is  governed by Articles
of
Incorporation  and By-Laws and is managed  under the  direction  of
a
Board  of  Directors.   LifeSpan   Income  Fund  is  a  diversified
series
of the  Company.  Oppenheimer  Integrity  Funds  (defined  above as
the
"Trust") was organized in 1982 as a multi-series Massachusetts
business  trust  and Bond Fund is the only  series  of that  Trust.
The

                                -9-

<PAGE>



Trust is governed by a Declaration of Trust and By-Laws and is managed under the
direction of a Board of Trustees. The Company is governed by applicable Maryland
law, whereas the Trust is governed by applicable  Massachusetts  law. Both Funds
are governed by  applicable  federal  law.  Oppenheimer  Series  Fund,  Inc. and
Oppenheimer  Integrity  Funds are open-end,  diversified  management  investment
companies.  Oppenheimer  Integrity Funds have an unlimited  number of authorized
shares of  beneficial  interest.  LifeSpan  Income  Fund is located at Two World
Trade Center,  New York,  New York  10048-0203  and Bond Fund is located at 6803
South  Tucson Way,  Englewood,  CO 80112.  The Company is governed by a Board of
Directors (defined above as the "Board") and the Trust is governed by a Board of
Trustees.  OppenheimerFunds,  Inc.  (the  "Manager")  whose address is Two World
Trade Center,  New York,  New York  10048-0203,  acts as  investment  adviser to
LifeSpan  Income  Fund and Bond  Fund  (collectively  referred  to herein as the
"Funds"). Additional information about the parties is set forth below.

Shares to be Issued

All  shareholders  of LifeSpan  Income Fund who own Class A shares will  receive
Class A shares of Bond Fund in  exchange  for their  Class A shares of  LifeSpan
Income Fund.  Shareholders  of LifeSpan  Income Fund who own Class B shares will
receive  Class B shares of Bond  Fund in  exchange  for their  Class B shares of
LifeSpan  Income  Fund.  Shareholders  of  LifeSpan  Income Fund who own Class C
shares will  receive  Class C shares of Bond Fund in exchange  for their Class C
shares of LifeSpan  Income  Fund.  The voting  rights of shares of each Fund are
substantially the same. See "Rights of Shareholders" below for more information.

The Reorganization

The Reorganization  Agreement provides for the transfer of substantially all the
assets of LifeSpan Income Fund to Bond Fund in exchange for Class A, Class B and
Class C shares of Bond
Fund.
The net asset  value of Bond Fund Class A, Class B and Class C shares  issued in
the exchange will equal the value of the assets of LifeSpan Income Fund received
by Bond Fund. In conjunction with the Closing of the  Reorganization,  presently
scheduled for June 12, 1998,  LifeSpan  Income Fund will distribute the Class A,
Class B and Class C shares of Bond Fund received by LifeSpan  Income Fund on the
Closing  Date to  holders  of Class A,  Class B and Class C shares  of  LifeSpan
Income  Fund,  respectively.  As a result of the  Reorganization,  each Class A,
Class B and Class C LifeSpan Income Fund  shareholder will receive the number of
full and fractional  Bond Fund Class A, Class B or Class C shares that equals in
value such  shareholder's  pro rata interest in the assets  transferred  to Bond
Fund as of the Valuation  Date. The Board of the Company has determined that the
interests of existing LifeSpan Income Fund shareholders will not be diluted as a
result of the Reorganization.

                               -10-

<PAGE>



For the  reasons  set forth  below  under "The  Reorganization  Reasons  for the
Reorganization,"  the Board,  including the  directors  who are not  "interested
persons" of Oppenheimer Series Fund, Inc. (the "Independent Directors"), as that
term  is  defined  in the  Investment  Company  Act,  have  concluded  that  the
Reorganization  is in the  best  interests  of  LifeSpan  Income  Fund  and  its
shareholders and recommends  approval of the  Reorganization  by LifeSpan Income
Fund shareholders.  If the Reorganization is not approved,  LifeSpan Income Fund
will  continue  in  existence  and the Board  will  determine  whether to pursue
alternative actions.

Reasons for the Reorganization

The Manager proposed to the Board a reorganization  of LifeSpan Income Fund into
Bond Fund so that  shareholders of LifeSpan Income Fund may become  shareholders
of a larger but similar Fund,  which is anticipated to have lower expenses after
such Reorganization.  The Board considered pro forma information which indicated
the expense ratio of a combined Fund would be lower than that of LifeSpan Income
Fund, as shown above under "Comparative Fee Table."

The  Board  also  considered  that  the  Reorganization  would  be  a  tax  free
reorganization,  and there would be no sales  charge  imposed in  effecting  the
Reorganization.  The Board concluded that the Reorganization would not result in
dilution to shareholders of
LifeSpan Income Fund.

Tax Consequences of the Reorganization

In the  opinion  of KPMG Peat  Marwick  LLP,  tax  adviser  to both  Funds,  the
Reorganization will qualify as a tax-free  reorganization for Federal income tax
purposes. As a result, it is expected that no gain or loss will be recognized by
either  Fund,  or by the  shareholders  of either  Fund for  Federal  income tax
purposes as a result of the  Reorganization.  For further  information about the
tax consequences of the  Reorganization,  see "Approval of the  Reorganization -
Tax Aspects" below.

Investment Objectives and Policies

The investment  objectives of the Funds are  substantially  the same.  Bond Fund
seeks a high level of current  income by  investing  mainly in debt  securities.
LifeSpan Income Fund seeks high current income,  with  opportunities for capital
appreciation. LifeSpan Income Fund is an asset allocation fund that invests in a
strategically  allocated portfolio of stocks and bonds,  consisting primarily of
bonds. The investment policies of each Fund are substantially  similar. The only
major  differences  between the Funds  regarding  permitted  investments is that
LifeSpan Income Fund may invest up to 35% of its assets in stocks. Bond Fund may
not purchase stocks. LifeSpan Income Fund may invest in inverse

                               -11-

<PAGE>



floating  rate  instruments,  and  warrants  and rights.  Bond Fund
may
purchase zero coupon securities.

Investment Advisory and Distribution and Service Plan Fees

Investment  Advisory Fees.  The terms and conditions of the Investment  Advisory
Agreement of each Fund are  similar.  Both Funds  obtain  investment  management
services from the Manager. The management fee is computed on the net asset value
of each Fund as of the close of  business  each day and  payable  monthly at the
following  annual rates:  LifeSpan  Income Fund pays 0.75% of the average annual
net assets up to $250  million and 0.65% of average  annual net assets over $250
million.  Bond Fund pays 0.75% of the first $200  million of average  annual net
assets,  0.72% of the next $200 million of average  annual net assets,  0.69% of
the next $200  million of  average  annual  net  assets,  0.66% of the next $200
million of average annual net assets,  0.60% of the next $200 million of average
annual net assets and .50% of average annual net assets in excess of $1 billion.

For LifeSpan  Income Fund,  the Manager  employs BEA  Associates  ("BEA")  which
provides investment advisory services to the high yield/high risk bond component
of the Fund (the  "Subadviser").  The Manager  manages the remaining  components
using  its own  investment  management  personnel.  Pursuant  to a  Sub-Advisory
Agreement  with BEA, the Manager pays BEA  quarterly at the annual rate of 0.45%
of the first $25 million of combined  average daily net assets allocated to BEA,
0.40% of the next $25  million,  0.35% of the next $50  million and 0.25% of the
assets  in excess of $100  million.  For  purposes  of  calculation  of the fees
payable  to BEA,  the net asset  value of those  portions  of the assets of each
Oppenheimer fund subadvised by BEA are aggregated with those portions of the net
assets of Panorama Series Fund, Inc. managed by BEA.

Distribution  and  Service  Fees.  LifeSpan  Income Fund and Bond Fund have both
adopted Service Plans for their  respective  Class A shares.  Both Service Plans
provide for reimbursement to the Distributor for a portion of its costs incurred
in connection  with the personal  service and  maintenance of accounts that hold
Class A shares.  Under each plan,  payment is made  quarterly  at an annual rate
that may not exceed 0.25% of the average  annual net assets of Class A shares of
the Fund.

LifeSpan  Income Fund and Bond Fund have each adopted  Distribution  and Service
Plans (the  "Plans")  for Class B and Class C shares  under which each Fund pays
the  Distributor for its services in connection  with  distributing  Class B and
Class C shares  and  servicing  accounts.  Under  each  Plan,  the Fund pays the
Distributor  an  asset-based  sales  charge  of 0.75% per year on Class B shares
outstanding for six years or less and on Class C shares. The Funds also each pay
the Distributor a service fee of 0.25% per year.

                               -12-

<PAGE>



Each  payment is computed  on the average  annual net assets of Class A, Class B
and Class C shares  determined  as of the close of each regular  business day of
each Fund. The  Distribution and Service Plans for Class B and Class C shares of
LifeSpan Income Fund and of Bond Fund are compensation plans whereby payments by
the Funds are made at a fixed rate as  specified  above and the Funds'  payments
are not  limited  to  reimbursing  the  Distributor's  costs.  The  terms of the
respective Plans for each Fund are substantially the same.

Purchases, Exchanges and Redemptions

LifeSpan Income Fund and Bond Fund are part of the  OppenheimerFunds  complex of
mutual funds. The procedures for purchases,  exchanges and redemptions of shares
of the Funds are substantially the
same.
Shares of either  Fund may be  exchanged  for  shares of the same class of other
Oppenheimer funds offering such shares.

LifeSpan  Income  Fund has a maximum  initial  sales  charge of 5.75% on Class A
shares. Bond Fund has a maximum initial sales charge of 4.75% on Class A shares.
Investors who purchase  more than $1 million  ($500,000 or more for purchases by
"Retirement  Plans" as defined in "Class A Contingent  Deferred Sales Charge" in
each Fund's  Prospectus)  in Class A shares pay no initial  sales charge but may
have to pay a sales  charge of up to 1% if shares  are sold  within 12  calendar
months (18 months for shares purchased prior to May 1, 1997) from the end of the
calendar  month  during  which  shares  are  purchased.  Each of the Funds has a
contingent  deferred  sales  charge  imposed on the  proceeds  of Class B shares
redeemed  within six years of buying them. The contingent  deferred sales charge
("CDSC")  varies  depending on how long you hold your shares.  Each of the Funds
has a contingent  deferred sales charge of 1% imposed on the proceeds of Class C
shares if redeemed within twelve months of their purchase.  Class A, Class B and
Class C shares of Bond Fund received in the Reorganization will be issued at net
asset value,  without a sales charge and no CDSC will be imposed on any LifeSpan
Income  Fund  shares  exchanged  for  Bond  Fund  shares  as  a  result  of  the
Reorganization.  However,  any CDSC which applies to LifeSpan Income Fund shares
will  continue  to apply to Bond Fund  shares  received  in the  reorganization.
Services available to shareholders of both Funds include purchase and redemption
of shares  through  OppenheimerFunds  AccountLink  and  PhoneLink  (an automated
telephone system),  telephone  redemptions,  and exchanges by telephone to other
Oppenheimer  funds  which  offer  Class  A,  Class  B and  Class C  shares,  and
reinvestment privileges. Please see "Shareholder Services" below and each Fund's
Prospectus for further information.

                      PRINCIPAL RISK FACTORS

In  evaluating  whether to approve the  Reorganization  and invest in Bond Fund,
shareholders should carefully consider the following

                               -13-

<PAGE>



risk factors,  the  information set forth in this Proxy Statement and Prospectus
and the more  complete  description  of risk factors set forth in the  documents
incorporated by reference  herein,  including the  Prospectuses of the Funds and
their respective Statements of Additional Information.

Stock Investment Risks. All investments carry risks to some degree, whether they
are risks that market prices of the investment  will fluctuate (this is known as
"market  risk")  or  that  the  underlying  issuer  will  experience   financial
difficulties and may default on its obligation  under a fixed-income  investment
to pay  interest  and repay  principal  (this is referred to as "credit  risk").
These  general  investment  risks  affect the value of both Funds'  investments,
their investment  performance,  and the prices of their shares.  LifeSpan Income
Fund invests  approximately 25% of its assets in stocks,  therefore the value of
the Fund's  portfolio  will be  affected by changes in the stock  markets.  This
market  risk will  affect  the  Fund's  net asset  value per  share,  which will
fluctuate as the values of the Fund's portfolio securities change. Not all stock
prices  change  uniformly  or at the same time,  and other  factors can affect a
particular stock's price (for example,  poor earnings reports by an issuer, loss
of major customers, major litigation against an issuer, or changes in government
regulations  affecting an industry).  Not all of these factors can be predicted.
Changes  in the  overall  market  conditions  and  prices can occur at any time.
LifeSpan Income Fund attempts to limit certain market risks by diversifying  its
investments,  that is, by not holding a  substantial  amount of the stock of any
one company, and by not investing too great a percentage of the Fund's assets in
any one company.

Interest Rate Risks.  Debt securities are subject to changes in their values due
to changes in prevailing  interest rates.  When prevailing  interest rates fall,
the value of already-issued debt securities  generally rise. When interest rates
rise,  the values of  already-issued  debt  securities  generally  decline.  The
magnitude  of these  fluctuations  will often be greater  for  longer-term  debt
securities than shorter-term debt securities. Each Fund's share prices can go up
or down when  interest  rates change  because of the effect of the change on the
value of the Fund's portfolio of debt  securities.  Each Fund has the ability to
invest its assets in high-yield securities. The Funds' investments in high-yield
securities are subject to greater market  fluctuation and risk of loss of income
and  principal  than lower  yielding,  investment  grade  securities.  There are
additional  risks of investing in lower grade  securities  that are described in
the prospectus for each Fund.

Foreign  Securities  Risks.  There are risks of  foreign  investing
that
increase  the risk of investing  in both  LifeSpan  Income Fund and
in
Bond Fund and also  increase  the  operating  costs of both  Funds.
For
example,    foreign    issuers    are   not    required    to   use
generally-accepted

                               -14-

<PAGE>



accounting principles.  If foreign securities are not registered for sale in the
U.S.  under U.S.  securities  laws,  the issuer does not have to comply with the
disclosure  requirements  of U.S. laws,  which are generally more stringent than
foreign laws. The values of foreign  securities  investments will be affected by
other factors,  including exchange control  regulations or currency blockage and
possible  expropriation or nationalization of assets. There are risks of changes
in foreign  currency  values.  Because  LifeSpan  Income  Fund and Bond Fund may
purchase securities  denominated in foreign  currencies,  a change in value of a
foreign  currency  against  the U.S.  dollar will result in a change in the U.S.
dollar value of securities of that Fund denominated in that currency.  There may
also be changes in governmental administration or economic or monetary policy in
the U.S.  or abroad  that can  affect  foreign  investing.  In  addition,  it is
generally more difficult to obtain court judgments  outside the United States if
that  Fund has to sue a  foreign  broker  or  issuer.  Additional  costs  may be
incurred  because  foreign  broker  commissions  are generally  higher than U.S.
rates,  and  there  are  additional  custodial  costs  associated  with  holding
securities  abroad.  More information  about the risks and potential  rewards of
investing in foreign  securities  is contained  in the  Statement of  Additional
Information of each Fund.

Derivative  Investments  Risks.  Both Funds may invest in a number of  different
kinds of "derivative"  investments.  In general, a "derivative"  investment is a
specially designed  investment whose performance is linked to the performance of
another  investment or security.  The company issuing the instrument may fail to
pay the amount due on the  maturity  of the  instrument.  Also,  the  underlying
investment  or security on which the  derivative  is based,  and the  derivative
itself,  may not  perform  the way  the  Manager  expected  it to  perform.  The
performance of derivative investments may also be influenced by stock market and
interest rate changes in the U.S. and abroad. All of this can mean that the Fund
may realize less principal or income from the investment than expected.  Certain
derivative  investments  held by the  Funds  may  trade in the  over-the-counter
market and may be illiquid.

Hedging  Instruments Risks. Each Fund may use certain hedging  instruments.  The
use of hedging  instruments  requires special skills and knowledge of investment
techniques  that are  different  than  what is  required  for  normal  portfolio
management. If the Manager uses a hedging instrument at the wrong time or judges
market conditions incorrectly,  hedging strategies may reduce the Fund's return.
Losses  could also be  experienced  if the  prices of its  futures  and  options
positions  were not  correlated  with its other  investments  or if it could not
close out a  position  because of an  illiquid  market for the future or option.
Options trading  involves the payment of premiums and has special tax effects on
the Funds. There are also special risks in particular hedging

                               -15-

<PAGE>



strategies. For example, if a covered call written by the Fund is exercised on a
security  that has  increased  in value,  the Fund will be  required to sell the
security  at the call  price and will not be able to  realize  any profit if the
security  has  increased  in value  above  the call  price.  The use of  Forward
Contracts may reduce the gain that would  otherwise  result from a change in the
relationship  between  the U.S.  dollar  and a  foreign  currency.  To limit its
exposure in foreign currency exchange  contracts,  each Fund limits its exposure
to the amount of its assets denominated in foreign currency. Interest rate swaps
are subject to risk that the other party will fail to meet its  obligations  (or
that the underlying  issuer will fail to pay on time),  as well as interest rate
risks. A Fund could be obligated to pay more under its swap  agreements  than it
received under them, as a result of interest rate changes.

Lower-Grade  Securities  Risks.  The  Funds  can  invest  in  high-yield,  below
investment grade debt securities  (including both rated and unrated securities).
These "lower-grade" securities are commonly known as "junk bonds". All corporate
debt  securities  (whether  foreign or  domestic)  are subject to some degree of
credit risk. High yield, lower-grade securities, whether rated or unrated, often
have  speculative  characteristics  and  special  risks  that make them  riskier
investments  than investment  grade  securities.  They may be subject to greater
market  fluctuations  and  risk of loss  of  income  and  principal  than  lower
yielding,  investment grade  securities.  There may be less of a market for them
and  therefore  they may be harder to sell at an  acceptable  price.  There is a
relatively greater possibility that the issuer's earnings may be insufficient to
make the payments of interest and principal  due on the bonds.  The issuer's low
creditworthiness  may  increase  the  potential  for its  insolvency.  During an
economic  downturn,  lower-grade  securities  might  decline  in value more than
investment grade  securities.  For foreign  lower-grade  debt securities,  these
risks are in addition to the risks of investing in foreign securities, described
above.  These risks mean that the Fund may not achieve the expected  income from
lower-grade  securities,  and that the Fund's  net asset  value per share may be
affected by declines  in value of these  securities.  Bond Fund may invest up to
35% of its assets in high-yield  securities and LifeSpan  Income Fund may invest
between 10% and 15% of its assets in these securities.

                  APPROVAL OF THE REORGANIZATION
                          (The Proposal)

Reasons for the Reorganization

At a meeting of the Board of Directors of the Company held on December 11, 1997,
the  Directors  reviewed  and  discussed  materials  relevant  to  the  proposed
Reorganization.  The Board,  including the  Independent  Directors,  unanimously
approved the  Reorganization  and recommended to shareholders of LifeSpan Income
Fund that they

                               -16-

<PAGE>



approve the Reorganization. Both Funds offer Class A, Class B and Class C shares
and the terms and  conditions  of their offer,  sale,  redemption  and exchange,
distribution  arrangements,  expenses  borne  separately by each class and other
related matters are  essentially  the same. The Board  considered that this will
facilitate  an  exchange.  In the  reorganization,  Class A, Class B and Class C
shareholders  of LifeSpan  Income Fund will receive Class A, Class B and Class C
shares, respectively, of Bond Fund.

In considering the proposed Reorganization, the Board reviewed information which
demonstrated  that LifeSpan Income Fund is a smaller Fund, with $30.1 million in
net assets as of October 31, 1997. In  comparison,  Bond Fund had $239.8 million
of net assets as of October 31, 1997. It is not anticipated that LifeSpan Income
Fund  will  increase  substantially  in  size  in the  near  future.  After  the
Reorganization, the shareholders of LifeSpan Income Fund will be shareholders of
a larger fund and will likely incur lower  operating,  transfer agency and other
expenses.  Thus economies of scale may benefit  shareholders  of LifeSpan Income
Fund.

Among  several  other  factors,  the Board  focused  on the  similar  investment
objectives of the two Funds. Oppenheimer LifeSpan Income Fund seeks high current
income,  with  opportunities  for capital  appreciation.  Bond Fund seeks a high
level of current income by investing mainly in debt instruments.  The investment
techniques  and  strategies  of the Funds are similar with respect to purchasing
debt securities,  mortgage-backed securities and collateralized  mortgage-backed
securities,  asset-backed  securities,  hedging  instruments,  when  issued  and
delayed delivery transactions,  repurchase  agreements,  illiquid and restricted
securities,  loans of portfolio securities, and derivative investments. The only
major differences between the Funds regarding permitted investments is that Bond
Fund may purchase zero coupon securities, and LifeSpan Income Fund may invest up
to 35% of its assets in equity  securities  of U.S.  and  foreign  issuers,  may
invest in inverse  floating  rate  instruments,  and may invest in warrants  and
rights.
Accordingly,
the  Board   determined   that  the   investment   objectives   and
techniques
were comparable.

The  Board,  in  reviewing  financial  information,  considered  the  investment
advisory fee rate of both Funds (also known as the "management  fee rate").  The
management  fee rates for both  Funds are set forth in  "Synopsis  -  Investment
Advisory and Distribution  and Service Plan Fees" above.  LifeSpan Income Fund's
management  fee for its fiscal year ended  October 31, 1997 was 0.75% of average
annual  net  assets  for  Class  A,  Class B and  Class C  shares.  Bond  Fund's
management  fee for the fiscal  year ended  December  31,  1997 was 0.75% of the
average  annual net  assets for Class A, Class B and Class C shares.  If the two
Funds were combined,  shareholders of Bond Fund would have a reduced  management
fee of approximately 0.01% for Class A, Class B and Class C shares. The Board

                               -17-

<PAGE>



considered  pro forma  information  which  indicated that the expense ratio of a
combined Fund would therefore be lower than that of
LifeSpan Income Fund.

In addition to the above, the Board also considered  information with respect to
the historical  performance of LifeSpan Income Fund and Bond Fund, including the
performance information contained in
Exhibit B to this Proxy Statement.

The Board also considered that the  Reorganization  is expected to be a tax free
reorganization,  and there would be no sales  charge  imposed in  effecting  the
Reorganization.  The Board concluded that the Reorganization would not result in
dilution of the interests of existing shareholders of LifeSpan Income Fund.

The Reorganization

The Reorganization  Agreement (a copy of which is set forth in full as Exhibit A
to this Proxy  Statement and  Prospectus)  contemplates a  reorganization  under
which (i) all of the assets of LifeSpan  Income Fund other than the cash reserve
described  below  (the  "Cash  Reserve")  will be  transferred  to Bond  Fund in
exchange for Class A, Class B and Class C shares of Bond Fund, (ii) these shares
will be distributed  among the  shareholders of LifeSpan Income Fund in complete
liquidation of LifeSpan Income Fund,  (iii) the  outstanding  shares of LifeSpan
Income Fund will be canceled.  Bond Fund will not assume any of LifeSpan  Income
Fund's  liabilities  except for portfolio  securities  purchased  which have not
settled and outstanding shareholder redemption and dividend checks.

The result of effectuating the Reorganization  would be that: (i) Bond Fund will
add to its gross assets all of the assets (net of any  liability  for  portfolio
securities purchased but not settled and outstanding  shareholder redemption and
dividend  checks) of LifeSpan Income Fund other than its Cash Reserve;  and (ii)
the  shareholders  of  LifeSpan  Income  Fund as of the close of business on the
Closing  Date will  become  shareholders  of either  Class A, Class B or Class C
shares of Bond Fund.

Shareholders of LifeSpan Income Fund who vote their Class A, Class B and Class C
shares  in favor of the  Reorganization,  will be  electing  in effect to redeem
their shares of LifeSpan  Income  Fund(at net asset value on the Valuation  Date
referred  to below  under  "Method of  Carrying  Out the  Reorganization  Plan,"
calculated  after  subtracting the Cash Reserve) and to reinvest the proceeds in
Class A, Class B or Class C shares of Bond Fund at net asset value without sales
charge and without  recognition  of taxable gain or loss for Federal  income tax
purposes (see "Tax Aspects of the  Reorganization"  below).  The Cash Reserve is
that amount retained by LifeSpan  Income Fund which is deemed  sufficient in the
discretion of that Fund's Board for the payment of: (a) LifeSpan

                               -18-

<PAGE>



Income Fund's expenses of liquidation, and (b) its liabilities, other than those
assumed by Bond Fund.  LifeSpan Income Fund and Bond Fund will bear all of their
respective  expenses  associated  with the  Reorganization,  as set forth  under
"Costs of the Solicitation and the Reorganization"  above.  Management estimates
that such expenses  associated with the  Reorganization  to be borne by LifeSpan
Income  Fund  will  not  exceed  $28,739.80.  Liabilities  as of the date of the
transfer of assets will consist primarily of accrued but unpaid normal operating
expenses of LifeSpan Income Fund, excluding the cost of any portfolio securities
purchased  but  not yet  settled  and  outstanding  shareholder  redemption  and
dividend checks. See "Method of Carrying Out the Reorganization Plan" below.

The Reorganization  Agreement provides for coordination  between the Funds as to
their  respective  portfolios so that,  after the Closing,  Bond Fund will be in
compliance with all of its investment policies and restrictions. In that regard,
the Manager does not anticipate selling more than 50% of the existing securities
in the  LifeSpan  Income Fund  portfolio.  LifeSpan  Income Fund will  recognize
capital gain or loss on any sales made prior to the  Reorganization  pursuant to
this paragraph.

Tax Aspects of the Reorganization

Immediately  prior  to the  Valuation  Date  referred  to in the  Reorganization
Agreement, LifeSpan Income Fund will pay a dividend or dividends which, together
with all previous  dividends,  will have the effect of  distributing to LifeSpan
Income Fund's  shareholders  all of LifeSpan  Income Fund's  investment  company
taxable  income  for  taxable  years  ending  on or  prior to the  Closing  Date
(computed without regard to any deduction for dividends paid) and all of its net
capital  gain,  if any,  realized  in  taxable  years  ending on or prior to the
Closing Date (after  reduction  for any available  capital loss  carry-forward).
Such dividends will be included in the taxable income of LifeSpan  Income Fund's
shareholders as ordinary income and capital gain, respectively.

The  exchange  of the assets of  LifeSpan  Income  Fund for Class A, Class B and
Class C  shares  of  Bond  Fund  and the  assumption  by  Bond  Fund of  certain
liabilities  of LifeSpan  Income Fund is intended to qualify for Federal  income
tax  purposes  as a  tax-free  reorganization  under  Section  368(a)(1)  of the
Internal Revenue Code of 1986, as amended (the "Code"). LifeSpan Income Fund has
represented to KPMG Peat Marwick LLP, tax adviser to LifeSpan  Income Fund, that
there is no plan or  intention  by any Fund  shareholder  who owns 5% or more of
LifeSpan Income Fund's outstanding  shares,  and, to LifeSpan Income Fund's best
knowledge,  there is no plan or intention on the part of the remaining  LifeSpan
Income Fund shareholders,  to redeem,  sell,  exchange or otherwise dispose of a
number of Bond Fund Class A, Class B or Class C shares

                               -19-

<PAGE>



received in the transaction that would reduce LifeSpan Income Fund shareholders'
ownership  of Bond Fund shares to a number of shares  having a value,  as of the
Closing  Date,  of less  than 50% of the value of all the  formerly  outstanding
LifeSpan  Income Fund shares as of the same date.  Bond Fund and LifeSpan Income
Fund have each  represented  to KPMG Peat Marwick LLP,  that,  as of the Closing
Date,  it will  qualify  as a  regulated  investment  company  or will  meet the
diversification test of Section 368(a)(2)(F)(ii) of the Code.

As a condition  to the  closing of the  Reorganization,  Bond Fund and  LifeSpan
Income  Fund will  receive  the  opinion of KPMG Peat  Marwick LLP to the effect
that, based on the Reorganization Agreement, the above representations, existing
provisions of the Code, Treasury Regulations issued thereunder,  current Revenue
Rulings,  Revenue  Procedures  and  court  decisions,  for  Federal  income  tax
purposes:

1.   The   transactions    contemplated   by   the   Reorganization
     Agreement
     will  qualify  as  a  tax-free   "reorganization"  within  the
     meaning
     of Section 368(a)(1)(c) of the Code.

2.   LifeSpan  Income  Fund and Bond  Fund will  each  qualify  as "a party to a
     reorganization" within the meaning of Section 368(b) of the Code.

3.   No gain or loss will be recognized by the  shareholders  of LifeSpan Income
     Fund  upon  the  distribution  of Class  A,  Class B or  Class C shares  of
     beneficial  interest in Bond Fund to the  shareholders  of LifeSpan  Income
     Fund pursuant to Section 354(a)(1) of the Code.

4.   Under  Section  361(a)  of the Code no gain or loss will be  recognized  by
     LifeSpan  Income  Fund by reason of the  transfer  of its assets  solely in
     exchange for Class A, Class B or Class C shares of Bond Fund.

5.   Under  Section  1032(a) of the Code no gain or loss will be  recognized  by
     Bond Fund by reason of the transfer of LifeSpan Income Fund's assets solely
     in exchange for Class A, Class B or
     Class C shares of Bond Fund.

6.   The  shareholders  of LifeSpan  Income Fund will have the same
     tax
     basis  and  holding   period  for  the  shares  of  beneficial
     interest
     in Bond  Fund  that  they  receive  as they  had for  LifeSpan
     Income
     Fund stock that they previously held, pursuant to Sections
     358(a)(1) and 1223(1) of the Code, respectively.

7.   The securities  transferred by LifeSpan  Income Fund to Bond Fund will have
     the same tax basis and holding period in the hands of Bond Fund as they had
     for LifeSpan  Income Fund,  pursuant to Sections  362(b) and 1223(2) of the
     Code, respectively.


                               -20-

<PAGE>



Shareholders of LifeSpan Income Fund should consult their tax advisors regarding
the  effect,  if  any,  of the  Reorganization  in  light  of  their  individual
circumstances. Since the foregoing discussion relates only to the Federal income
tax  consequences  of the  Reorganization,  shareholders of LifeSpan Income Fund
should also consult  their tax advisors as to state and local tax  consequences,
if any, of the Reorganization.

Capitalization Table (Unaudited)

The table below sets forth the  capitalization  of LifeSpan Income Fund and Bond
Fund and indicates the pro forma combined capitalization as of December 31, 1997
as if the Reorganization had
occurred on that date.

December 31, 1997
                                                          Net
Asset
                                           Shares         Value
                           Net Assets      Outstanding    Per
Share

LifeSpan Income Fund
     Class A               $29,330,773     2,642,551      $11.10
     Class B               $   880,281        79,058      $11.13
     Class C               $    34,796         3,127      $11.13

Bond Fund
     Class A               $190,705,711    17,383,073     $10.97
     Class B               $ 48,254,895     4,399,924     $10.97
     Class C               $  9,188,036       837,017     $10.98

Bond Fund
(Pro Forma Surviving Fund)
     Class A               $220,036,484    20,056,799     $10.97
     Class B               $ 49,135,176    4,480,168      $10.97
     Class C               $  9,222,832       840,186     $10.98

Reflects  issuance of 2,673,726 of Class A shares,  80,244 of Class B shares and
3,169 of Class C shares of Bond Fund in a tax-free  exchange  for the net assets
of LifeSpan Income Fund, aggregating
$30,245,850.

The pro forma  ratio of  expenses  to  average  annual net assets of the Class A
shares at  December  31,  1997 would  have been  1.26%.  The pro forma  ratio of
expenses to average net assets of Class B shares at December 31, 1997 would have
been  2.00%.  The pro forma  ratio of  expenses to average net assets of Class C
shares at December 31, 1997 would have been 2.00%.





                               -21-

<PAGE>



                        COMPARISON BETWEEN
                     LifeSpan Income Fund AND
                             Bond Fund

Information  about  LifeSpan  Income  Fund and  Bond  Fund is  presented  below.
Additional  information  about  Bond Fund is set forth in its  Prospectus  which
accompanies this Proxy Statement and
Prospectus.
More information about both Funds is set forth in documents that
may  be  obtained  upon  request  of the  transfer  agent  or  upon
review
at the offices of the SEC.  See "Additional Information- Public
Information."

Investment Objectives and Policies

Bond Fund. Bond Fund seeks a high level of current income by investing mainly in
debt instruments.  Under normal market conditions, the Fund invests at least 65%
of its  total  assets in  investment  grade  debt  securities,  U.S.  Government
Securities,  and money market instruments.  Investment-grade debt securities are
those  rated  in one  of the  four  highest  categories  by  Standard  &  Poor's
Corporation ("Standard & Poor's"),  Moody's Investors Service, Inc. ("Moody's"),
Fitch   Investors   Service,   Inc.   or  other   nationally-recognized   rating
organization.  Debt securities (often referred to as "fixed-income  securities")
are used by issuers to borrow money from  investors.  The issuer promises to pay
the investor interest at a fixed or variable rate, and to pay back the amount it
borrowed  (the  "principal")  at maturity.  Some debt  securities,  such as zero
coupon bonds do not pay current  interest.  The Fund may invest up to 35% of its
total assets in debt securities rated less than investment grade or, if unrated,
judged by the Manager to be of comparable quality to such lower-rated securities
(collectively,   "lower-grade   securities").   Lower-grade  securities  include
securities rated BB, B, CCC, CC and D by Standard & Poor's or Ba, B, Caa, Ca and
C by Moody's.  Lower-grade securities (often called "junk bonds") are considered
speculative and involve greater risk.

When investing the Fund's assets, the Manager considers many factors,  including
current  developments and trends in both the economy and the financial  markets.
The  Fund may try to hedge  against  losses  in the  value of its  portfolio  of
securities by using hedging  strategies  described below. The Manager may employ
special  investment  techniques,  also described below.  Additional  information
about the securities the Fund may invest in, the hedging strategies the Fund may
employ  and the  special  investment  techniques  may be  found  under  the same
headings in the Bond Fund Statement of Additional Information.

LifeSpan Income Fund. LifeSpan Income Fund seeks high current
income,  with  opportunities  for  capital  appreciation.  The Fund
is
an asset allocation fund which seeks to achieve its investment

                               -22-

<PAGE>



objective by allocating its assets among two broad classes of investments-stocks
and bonds. The stock class includes growth and income type securities.  The Fund
normally  allocates  25% of its  assets to the stock  component.  The bond class
includes several varieties of fixed-income instruments.  Allocating assets among
different  types of investments  allows this Fund to take advantage of a greater
variety of  investment  opportunities  than funds that  invest in only one asset
class, but also subjects the Fund to the risks of those types of investments.

The  Manager  has the ability to allocate  the Fund's  assets  within  specified
ranges.  The Fund's normal  allocation (which is 25% in stocks and 75% in bonds)
indicates the benchmark for its  combination  of investments in each asset class
over time. As market and economic  conditions change,  however,  the Manager may
adjust the asset mix between the stock and bond  classes  within a normal  asset
allocation range as long as the relative risk and return characteristics of this
Fund remain  distinct and this Fund's  investment  objective is  preserved.  The
Manager  will  review  normal  allocations  between  the stock and bond  classes
quarterly and, if necessary,  will  rebalance the investment  allocation at that
time.  Additional  adjustments may be made if an asset allocation shift of 5% or
more is warranted.

Permitted Investments by Both LifeSpan Income Fund and Bond Fund

Foreign Securities. Each Fund may invest in debt securities issued or guaranteed
by  foreign  companies,  and debt  securities  of foreign  governments  or their
agencies.  These  foreign  securities  may  include  debt  obligations  such  as
government  bonds,  debentures  issued by companies,  as well as notes.  Some of
these debt  securities may have variable  interest rates or "floating"  interest
rates that change in different market conditions.  Those changes will affect the
income the Fund receives.  LifeSpan Income Fund may also invest up to 15% of the
stock  component of the  portfolio in stocks of foreign  issuers that  generally
have a substantial portion of their business in the U.S.

ADRs, EDRs and GDRs.  Both Funds may invest a portion of their
assets  in ADRs,  EDRs and  GDRs.  ADRs are  receipts  issued  by a
U.S.
bank or trust company which evidence ownership of underlying
securities of foreign companies. ADRs are traded on domestic
exchanges or in the U.S. over-the-counter market and, generally,
are in  registered  form.  EDRs and GDRs  are  receipts  evidencing
an
arrangement  with a  non-U.S.  bank  similar  to that  for ADRs and
are
designed for use in non-U.S. securities markets.

Convertible Securities. LifeSpan Income Fund may invest in
convertible securities.  Convertible securities are bonds,
preferred stocks and other securities that normally pay a fixed
rate of interest or dividend and give the owner the option to

                               -23-

<PAGE>



convert  the  security  into  common  stock.  While  the  value  of  convertible
securities  depends in part on interest  rate changes and the credit  quality of
the  issuer,  the price will also  change  based on the price of the  underlying
stock. While convertible  securities generally have less potential for gain than
common  stock,  their  income  provides  a cushion  against  the  stock  price's
declines. They generally pay less income than non-convertible bonds. The Manager
generally  analyzes  these  investments  from  the  perspective  of  the  growth
potential of the underlying stock and treats them as "equity substitutes."

Hedging.  Each Fund may purchase and sell  certain  kinds of futures  contracts,
forward contracts,  and options on futures,  broadly-based stock or bond indices
and foreign  currencies,  or enter into interest rate swap agreements.  LifeSpan
Income  Fund may sell  covered  call  options  and may  purchase  put options on
Futures.  These are all  referred to as "hedging  instruments."  While each Fund
currently  does not  engage  extensively  in  hedging,  each  Fund may use these
instruments for hedging purposes and , in the case of covered calls, non-hedging
purposes.  The hedging  instruments the Funds may use are described below and in
greater detail in the "Other  Investment  Techniques and Strategies"  section in
each Fund's respective Statement of Additional Information.

The Funds may use hedging instruments for a number of purposes. Each Fund may do
so to try to manage  its  exposure  to the  possibility  that the  prices of its
portfolio  securities may decline,  or to establish a position in the securities
market as a temporary substitute for purchasing individual securities. Each Fund
may do so to try to manage its  exposure to  changing  interest  rates.  Some of
these  strategies,  such as selling  futures,  buying puts and  writing  covered
calls,  hedge a Fund's  portfolio  against  price  fluctuations.  Other  hedging
strategies,  such as buying futures and call options,  tend to increase a Funds'
exposure to the securities market.

Forward  Contracts.  Forward  contracts  are used by both Funds to try to manage
foreign currency risks on foreign investments. Foreign currency options are used
to try to protect against declines in the dollar value of foreign securities the
Funds  own,  or to  protect  against an  increase  in the dollar  cost of buying
foreign securities.  Writing covered call options may also provide income to the
Funds for liquidity purposes or to raise cash to distribute to shareholders.

Futures.  Both  Funds  may buy and sell  futures  contracts  that  relate to (1)
foreign  currencies  (these  are  referred  to as  "Forward  Contracts"  and are
discussed  above),(2)  financial  indices,  such as U.S.  or foreign  government
securities  indices,  corporate  debt  securities  indices or equity  securities
indices  (these are  referred to as Financial  Futures)  and (3) interest  rates
(those are referred

                               -24-

<PAGE>



to as Interest Rate  Futures).  Both Funds may use futures for hedging  purposes
and LifeSpan Income Fund may use futures for non- hedging purposes.  These types
of Futures are described in "Hedging" in the Statement of Additional Information
of each Fund.

Covered  Call  Options and  Options on  Futures.  Both Funds may write (that is,
sell) covered call options on  securities,  indices and foreign  currencies  for
hedging or liquidity  purposes and write call options on Futures for hedging and
non-hedging  purposes.  Each call the Funds write must be "covered".  This means
the Fund must own the  investment  on which the call was  written or it must own
other  securities that are acceptable for the escrow  arrangements  required for
calls. When either Fund writes a call, it receives cash (called a premium).  The
call  gives the buyer the  ability to buy the  investment  on which the call was
written  from the Fund at the call price during the period in which the call may
be exercised. If the value of the investment does not rise above the call price,
it is likely that the call will lapse  without being  exercised,  while the Fund
keeps the cash  premium  (and the  investment).  Up to 50% of Bond Fund's  total
assets  may be  subject  to  calls.  Bond  Fund may also  buy  call  options  on
securities  indices,  foreign  currencies,  or  Futures,  or  to  terminate  its
obligation on a call the Fund previously wrote.

Both Funds may  purchase  and sell put  options on  Futures.  Buying a put on an
investment  gives the Fund the right to sell the  investment at a set price to a
seller of a put on that
investment.
Both  Funds  may  sell a put  on  Futures  only  if  the  puts  are
covered
by segregated liquid assets.

LifeSpan  Income Fund may sell  covered  call options that are traded on U.S. or
foreign  securities or commodity  exchanges as well as over the counter markets.
In the case of foreign currency options,  they may be quoted by major recognized
dealers in those options.

Bond Fund may  purchase  put  options.  Bond  Fund may buy puts  that  relate to
securities, indices, Futures, or foreign currencies. The Fund may buy a put on a
security whether or not the Fund owns the particular  security in its portfolio.
The Fund may sell a put on securities,  indices, Futures, or foreign currencies,
but only if the puts are covered by segregated liquid assets. The Bond Fund will
not write  puts if more  than 50% of the  Fund's  net  assets  would  have to be
segregated to cover put obligations.

A call or put may be  purchased by Bond Fund only if,  after the  purchase,  the
value of all call and put  options  held by the Bond Fund will not  exceed 5% of
the Fund's total assets. The Fund may buy and sell put and call options that are
traded on U.S. or foreign securities or commodity exchanges or are traded in the
over-the-counter  markets. In the case of foreign currency options,  they may be
quoted by major recognized dealers in those options.

                               -25-

<PAGE>



Options traded in the over-the-counter market may be "illiquid,"
and  therefore  may  be  subject  to  the  Fund's  restrictions  on
illiquid
investments.

Both Funds may enter into  interest  rate swaps for hedging  purposes  and,  for
LifeSpan Income Fund to seek to increase total return.
 In
an  interest  rate swap,  the Fund and  another  party  exchange  their right to
receive, or their obligation to pay, interest on a security.  For example,  they
swap a right to receive floating rate interest payments for fixed rate payments.
The Fund  enters  into swaps only on a net basis,  which  means the two  payment
streams are netted out, with the Fund  receiving or paying,  as the case may be,
only the net amount of the two payments.  The Fund will segregate  liquid assets
of any type (such as cash, U.S. Government,  equity or debt securities) to cover
any  amounts it could owe under  swaps that exceed the amounts it is entitled to
receive,  and it will adjust that amount daily, as needed. The Bond Fund may not
enter into swaps with respect to more than 25% of its total assets,  and only on
assets it owns.

Loans of Portfolio Securities.  To raise cash for liquidity purposes, both Funds
may lend their  portfolio  securities  to brokers,  dealers and other  financial
institutions.  Both Funds must receive  collateral for a loan.  Bond Fund limits
these  loans to not more  than 25% of the  value  of the  Fund's  total  assets.
LifeSpan  Income Fund limits  these loans to not more than 33-1/3% of the Fund's
assets  (taken at market  value).  Neither  Fund  presently  intends to lend its
portfolio securities, but if they do the value of the securities borrowed is not
expected to exceed 5% of each Fund's total assets in the coming year.

Illiquid and Restricted Securities. Both of the Funds may invest in illiquid and
restricted securities.  Investments may be illiquid because of the absence of an
active  trading  market,  making it  difficult  to value them or dispose of them
promptly  at an  acceptable  price.  A  restricted  security  is one  that has a
contractual  restriction on its resale or which cannot be sold publicly until it
is registered  under the Securities Act of 1933.  Bond Fund will not invest more
than 10% of its net assets in illiquid and restricted  securities  (the Board of
Bond Fund may increase  that limit to 15% of net assets).  LifeSpan  Income Fund
will not  invest  more than 15% of its net  assets in  illiquid  and  restricted
securities.  The percentage  limitation on these  investments  does not apply to
certain  restricted  securities  that  are  eligible  for  resale  to  qualified
institutional purchasers. The Manager monitors holdings of such securities on an
ongoing  basis  and at times a Fund may be  required  to sell some  holdings  to
maintain adequate liquidity.

Derivative Investments. Both Funds can invest in a number of
different  kinds of "derivative investments."  Each Fund may use

                               -26-

<PAGE>



some types of derivatives for hedging purposes, and may invest in others to seek
income. In general, a "derivative investment" is a specially-designed investment
whose  performance  is  linked  to the  performance  of  another  investment  or
security,  such as an option,  future, index, currency or commodity.  Both Funds
may not purchase or sell physical commodities. This policy also does not prevent
the Funds from engaging in hedging  transactions,  buying or selling options and
futures  contracts or foreign  currency or from investing in securities or other
instruments   backed  by   physical   commodities.   In  the   broadest   sense,
exchange-traded  options and futures  contracts  may be  considered  "derivative
investments".   Each  Fund  may  invest  in  different   types  of  derivatives.
"Index-linked" or "commodity-linked" notes are debt securities of companies that
call  for  interest  payments  and/or  payment  on the  maturity  of the note in
different  terms than the typical note where the borrower  agrees to pay a fixed
sum on the  maturity  of the note.  Principal  and/or  interest  payments  on an
index-linked note depend on the performance of one or more market indices,  such
as the S & P 500 Index or a weighted index of commodity  futures,  such as crude
oil,  gasoline and natural gas. Each Fund may invest in "debt  exchangeable  for
common stock" of an issuer or  "equity-linked"  debt securities of an issuer. At
maturity,  the  principal  amount of the debt  security is exchanged  for common
stock of the  issuer or is  payable in an amount  based on the  issuer's  common
stock  price at the time of  maturity.  In either  case there is a risk that the
amount  payable at maturity will be less than the expected  principal  amount of
the debt.

Bond Fund may also invest in currency-indexed  securities.  Typically, these are
short-term  or  intermediate-term  debt  securities  having a value at maturity,
and/or  an  interest  rate,  determined  by  reference  to one or  more  foreign
currencies.  The  currency-indexed  securities  purchased  by the  Fund may make
payments based on a formula.  The payment of principal or periodic  interest may
be  calculated  as a multiple of the  movement of one currency  against  another
currency,  or against an index.  These  investments may entail increased risk to
principal and increased price volatility.

Repurchase   Agreements.   Each  of  the  Funds   may  enter   into
repurchase
agreements.   In  a  repurchase   transaction,   the  Fund  buys  a
security
and  simultaneously  sells  it to  the  vendor  for  delivery  at a
future
date.   Repurchase   agreements   must   be   fully   collaterized.
However,
if the vendor fails to pay the resale price on the delivery  date,  the Fund may
incur costs in disposing of the collateral and may experience losses if there is
any delay in its  ability to do so.  Bond Fund will not enter into a  repurchase
agreement  that will  cause more than 10% of the Fund's net assets to be subject
to repurchase  agreements maturing in more than seven days. LifeSpan Income Fund
will not enter into a repurchase  agreement that will cause more than 15% of its
net assets to be subject to  repurchase  agreements  maturing in more than seven
days. There is no limit on

                               -27-

<PAGE>



the  amount of either  Fund's  net  assets  that may be  subject  to  repurchase
agreements of seven days or less.


Warrants and Rights.  Warrants  basically  are options to purchase  stock at set
prices  that are valid  for a limited  period of time.  Rights  are  similar  to
warrants but normally have a short duration and are distributed  directly by the
issuer to its  shareholders.  LifeSpan  Income  Fund may  invest up to 5% of its
total  assets  in  warrants  or  rights.  That 5%  limitation  does not apply to
warrants acquired as part of units with other securities or that are attached to
other securities.  No more than 2% of LifeSpan Income Fund's total assets may be
invested in warrants  that are not listed on either The New York Stock  Exchange
or The  American  Stock  Exchange.  Bond Fund does not  invest in  Warrants  and
Rights.

"When-Issued"  and  Delayed  Delivery  Transactions.  Both  Funds  may  purchase
securities  on a  "when-issued"  basis and may purchase or sell  securities on a
"delayed delivery" basis. These terms refer to securities that have been created
and for  which a market  exists,  but  which  are not  available  for  immediate
delivery.  There may be a risk of loss to the Fund if the value of the  security
declines prior to the settlement date.

U.S. Government Securities. Both Funds may invest in U.S.
Government Securities which include debt securities issued or
guaranteed by the U.S. Government or its agencies and
instrumentalities. Certain U.S. Government Securities, including
U.S. Treasury bills, notes and bonds, and mortgage participation
certificates guaranteed by the Government National Mortgage
Association ("Ginnie Mae") are supported by the full faith and
credit of the U.S. Government, which in general terms means that
the U.S.  Treasury  stands  behind the  obligation to pay principal
and
interest.

Ginnie  Mae  certificates  are one  type  of  mortgage-related  U.S.  Government
Security  the  Funds  may  invest  in.  The  Funds  may  also  invest  in  other
mortgage-related  U.S.  Government  Securities  that are issued or guaranteed by
federal agencies or government-sponsored entities but which are not supported by
the full  faith and  credit of the U.S.  Government.  Those  securities  include
obligations  supported  by the  right  of the  issuer  to  borrow  from the U.S.
Treasury,  such as  obligations  of the Federal Home Loan  Mortgage  Corporation
("Freddie   Mac"),   obligations   supported   only   by  the   credit   of  the
instrumentality,  such as the Federal  National  Mortgage  Association  ("Fannie
Mae") or the Student Loan Marketing  Association,  and obligations  supported by
the  discretionary  authority  of the  U.S.  Government  to  repurchase  certain
obligations of U.S. Government agencies or instrumentalities such as the Federal
Land Banks and the Federal Home Loan Banks. Other U.S. Government Securities the
Funds may

                               -28-

<PAGE>



invest in are collateralized mortgage obligations ("CMOs").

The  value of U.S.  Government  Securities  will  fluctuate  until  they  mature
depending on prevailing  interest rates.  Because the yields on U.S.  Government
Securities are generally lower than on corporate debt securities, when the Funds
hold U.S.  Government  Securities each may attempt to increase the income it can
earn from them by  writing  covered  call  options  against  them,  when  market
conditions are  appropriate.  Writing  covered calls is explained  above,  under
"Hedging."

Lower-Grade  Debt  Securities.  Both  Funds  may  invest in  "lower-grade"  debt
securities  which generally offer higher income  potential than investment grade
securities.  "Lower-grade"  securities are those rated below "BBB" by Standard &
Poor's  Corporation("Standard & Poor's") or "Baa" by Moody's Investors Services,
Inc.
("Moody's")
or similar ratings given by other domestic or foreign rating  organizations,  or
securities that are not rated by a nationally-recognized rating organization but
the Manager judges them to be comparable to lower-rated securities.

Mortgage-Backed Securities, CMOs and REMICS. Certain mortgage-backed securities,
whether issued by the U.S.  Government or by private issuers,  "pass-through" to
investors the interest and principal  payments  generated by a pool of mortgages
assembled  for  sale  by  government  agencies.   Pass-through   mortgage-backed
securities  entail the risk that  principal may be repaid at any time because of
prepayments on the underlying  mortgages.  As a result,  these securities may be
subject to greater  price and yield  volatility  than  traditional  fixed-income
securities that have a fixed maturity and interest rate.

Both Funds may invest in collateralized  mortgage-backed  obligations  ("CMOs"),
which generally are obligations fully collateralized by a portfolio of mortgages
or  mortgage-related  securities.  LifeSpan  Income Fund may also invest in real
estate mortgage  investment  conduits  (REMICS)but it does not intend to acquire
"residual" interest in them. Payments of the interest and principal generated by
the pool of mortgages  relating to the CMOs and REMICS are passed through to the
holders as the payments are received.  CMOs and REMICS are issued with a variety
of classes or series which have  different  maturities.  Certain CMOs and REMICS
may be more  volatile  and less  liquid  than  other  types of  mortgage-related
securities,  because of the  possibility of the early repayment of principal due
to  prepayments  on the  underlying  mortgage  loans.  Prepayments on fixed rate
mortgage loans generally  increase during periods of falling  interest rates and
decrease  during periods of rising  interest  rates. If prepayments of mortgages
underlying  a  short-term  or  intermediate-term  CMO  occur  more  slowly  than
anticipated,  the CMO effectively may become a long-term security. The prices of
long-term securities generally fluctuate more widely in response to

                               -29-

<PAGE>



changes in interest rates.

o "Stripped" Securities. Both Funds may also invest in CMOs that are "stripped."
LifeSpan Income Fund may also invest in REMICS that are  "stripped".  That means
that the security is divided into two parts,  one of which  receives some or all
of the  principal  payments  (and is known as a  "principal-only"  security,  or
"P/O") and the other which receives some or all of the interest (and is known as
an "interest-only"  security, or "I/O"). P/Os and I/Os are generally referred to
as "derivative investments", discussed further above.

The yield to  maturity on the class that  receives  only  interest is  extremely
sensitive to the rate of payment of the principal on the  underlying  mortgages.
Principal  prepayments  increase that sensitivity.  Stripped securities that pay
"interest only" are therefore  subject to greater price volatility when interest
rates change, and they have the additional risk that if the underlying mortgages
are prepaid, a Fund will lose the anticipated cash flow from the interest on the
prepaid mortgages.  That risk is increased when general interest rates fall, and
in times of rapidly falling  interest rates, a Fund might receive back less than
its investment.

The value of "principal only" securities  generally  increases as interest rates
decline and prepayment  rates rise.  The price of these  securities is typically
more volatile than that of coupon-bearing bonds of the same maturity.

Private-issuer   stripped   securities  are  generally  purchased  and  sold  by
institutional   investors   through   investment   banking  firms.  At  present,
established  trading  markets  have  not yet  developed  for  these  securities.
Therefore,  most private-issuer stripped securities may be deemed "illiquid." If
either Fund holds illiquid stripped  securities,  the amount it can hold will be
subject to that  Fund's  investment  policy  limiting  investments  in  illiquid
securities to 10% for Bond Fund, and 15% for LifeSpan Income Fund.

Bond Fund may also enter into "forward roll"  transactions with  mortgage-backed
securities. The Fund sells mortgage-backed securities it holds to banks or other
buyers and  simultaneously  agrees to  repurchase a similar  security  from that
party at a later date at an agreed-upon  price.  Forward rolls are considered to
be a  borrowing.  The Fund is  required  to  segregate  liquid  assets  with its
custodian bank in an amount equal to its obligation  under the forward roll. The
main risk of this investment strategy is risk of default by the counterparty.

Asset-Backed Securities. Both Funds may invest in "asset-backed"
securities.   These  represent   interests  in  pools  of  consumer
loans
and   other   trade   receivables,   similar   to   mortgage-backed
securities.
They are  issued  by trusts  and  "special  purpose  corporations."
They

                               -30-

<PAGE>



are backed by a pool of assets,  such as credit  card or auto loan  receivables,
which are the obligations of a number of different parties.  The income from the
underlying pool is passed through to holders,  such as a Fund.  These securities
may be  supported  by a  credit  enhancement,  such as a  letter  of  credit,  a
guarantee or a preference right.  However,  the extent of the credit enhancement
may be  different  for  different  securities  and  generally  applies to only a
fraction of the security's  value.  These securities  present special risks. For
example, in the case of credit card receivables,  the issuer of the security may
have no security interest in the related collateral.

Inverse  Floating Rate  Instruments.  LifeSpan Income Fund may invest in inverse
floating rate debt instruments ("inverse floaters"), including leveraged inverse
floaters and inverse floating rate mortgage-backed  securities,  such as inverse
floating rate "interest only" stripped mortgage-backed  securities. The interest
rate on inverse  floaters resets in the opposite  direction from the market rate
of interest to which the inverse  floater is indexed.  An inverse floater may be
considered  to be  leveraged  to the extent that its  interest  rate varies by a
magnitude  that  exceeds  the  magnitude  of the  change  in the  index  rate of
interest.  The  higher  degree of  leverage  inherent  in  inverse  floaters  is
associated with greater volatility in their market values.

Structured  Notes.  Both Funds may invest in structured notes. A structured note
is a debt security  having an interest rate or principal  repayment  requirement
based on the performance of a benchmark  asset or market,  such as stock prices,
currency  exchange  rates or  commodity  prices.  They  provide  exposure to the
benchmark  market  while fixing the maximum loss if that market does not perform
as  expected.  Depending on the terms of the note, a Fund could lose all or part
of the interest and principal that would be payable on a comparable conventional
note.

Short-Term  Debt  Securities.  Under normal  market  conditions,  both Funds may
invest in short-term debt securities,  such as money market instruments and U.S.
Government securities. When the Manager believes it is appropriate (for example,
for temporary defensive purposes during unstable market conditions),  a Fund can
hold cash or invest without limit in money market instruments.
A
Fund will invest in high quality,  short-term  money market  instruments such as
U.S. Treasury and agency obligations;  commercial paper (short-term,  unsecured,
negotiable  promissory notes of a domestic or foreign company);  short-term debt
obligations  of  corporate  issuers;  and  certificates  of deposit and bankers'
acceptances  (time drafts drawn on commercial  banks usually in connection  with
international  transactions)  of domestic or foreign  banks and savings and loan
associations.

Eurodollar  and Yankee  Dollar Bank  Obligations.  LifeSpan  Income
Fund

                               -31-

<PAGE>



may invest in obligations of foreign branches of U.S. banks
(referred to as Eurodollar obligations) and U.S. branches of
foreign banks (referred to as Yankee Dollars) as well as foreign
branches of foreign  banks.  These  investments  entail  risks that
are
different from investment in securities of U.S. banks.

Small,  Unseasoned  Companies.  LifeSpan Income Fund may invest in securities of
small,  unseasoned  companies.  These are companies  that have been in operation
less than three years, including the operations of any predecessors.  Securities
of these  companies  may have limited  liquidity  (which means that the Fund may
have  difficulty  selling them at an acceptable  price when it wants to) and the
price of these securities may be volatile.

Zero Coupon Securities.  Bond Fund may invest in zero coupon  securities.  These
securities,  which  may be  issued  by the  U.S.  government,  its  agencies  or
instrumentalities or by private issuers, are purchased at a substantial discount
from their face value. They are subject to greater  fluctuations in market value
as interest rates change than debt  securities  that pay interest  periodically.
Interest accrues on zero coupon bonds even though cash is not actually received.

Preferred  Stocks.  Bond Fund may invest in preferred  stocks.  Preferred stock,
unlike common stock,  generally  offers a stated  dividend rate payable from the
corporation's  earnings.  Such  preferred  stock  dividends may be cumulative or
non-cumulative, fixed, participating, or auction rate. If interest rates rise, a
fixed dividend on preferred stocks may be less attractive,  causing the price of
preferred  stocks to  decline.  The rights to payment  of  preferred  stocks are
generally subordinate to rights associated with a corporation's debt securities.

Investment Restrictions

LifeSpan Income Fund and Bond Fund have certain  investment  restrictions  that,
together with their investment objectives, are fundamental policies,  changeable
only by  shareholder  approval.  Set forth below is a summary of the  investment
restrictions  which are different for each Fund. Other  investment  restrictions
for each Fund are  substantially  the same.  Unless the  Prospectus  of the Fund
states that a percentage  restriction  applies on an ongoing  basis,  it applies
only at the time  that  Fund  makes  an  investment  and the Fund  need not sell
securities  to  meet  the  percentage  limits  if the  value  of the  investment
increases in proportion to the size of the Fund.

Bond Fund - Investment Restrictions.  Bond Fund cannot do the
following:

1. The Fund  cannot  make short  sales  except  for sales  "against
the

                               -32-

<PAGE>



box";

2. The Fund cannot  borrow  money or enter into reverse  repurchase  agreements,
except  that the Fund may  borrow  money  from  banks  and  enter  into  reverse
repurchase  agreements  as a temporary  measure for  extraordinary  or emergency
purposes  (but not for the  purpose of making  investments),  provided  that the
aggregate  amount of all such borrowings and  commitments  under such agreements
does not, at the time of borrowing or of entering into such an agreement, exceed
10% of the Fund's total assets taken at current market value;  the Fund will not
purchase additional  portfolio  securities at any time that the aggregate amount
of its  borrowings  and its  commitments  under  reverse  repurchase  agreements
exceeds 5% of the Fund's net assets (for purposes of this restriction,  entering
into portfolio  lending  agreements shall not be deemed to constitute  borrowing
money);

3. The Fund cannot concentrate its investments in any particular industry except
that it may invest up to 25% of the value of its total assets in the  securities
of issuers in any one industry (of the utility companies,  gas, electric,  water
and telephone will each be considered as a separate industry);

4. The Fund may not make loans other than by investing in  obligations  in which
the Fund may invest  consistent  with its investment  objective and policies and
other than repurchase agreements and loans of portfolio securities; and

5. The Fund may not pledge,  mortgage or hypothecate its assets, except that, to
secure permitted  borrowings,  it may pledge securities having a market value at
the time of the pledge not  exceeding 15% of the cost of the Fund's total assets
and  except in  connection  with  permitted  transactions  in  options,  futures
contracts  and options on future  contracts,  and except for reverse  repurchase
agreements and securities lending.

LifeSpan Income Fund - Investment Restrictions.  LifeSpan Income
Fund cannot do the following:

1. Borrow money,  except for emergency or extraordinary  purposes  including (i)
from  banks  for  temporary  or  short-term  purposes  or for the  clearance  of
transactions  in amounts not to exceed 33 1/3% of the value of the Fund's  total
assets (including the amount borrowed) taken at market value, (ii) in connection
with the redemption of Fund shares or to finance failed settlements of portfolio
trades without immediately liquidating portfolio securities or other assets; and
(iii) in order to fulfill commitments or plans to purchase additional securities
pending the anticipated sale of other portfolio  securities or assets,  but only
if after each such borrowing there is asset coverage of at least 300% as defined
in the  Investment  Company Act. For  purposes of this  investment  restriction,
reverse repurchase agreements,

                               -33-

<PAGE>



mortgage  dollar  rolls,  short  sales,  futures  contracts,  options on futures
contracts, securities or indices and forward commitment
transactions shall not constitute borrowing.

2. A Fund  cannot  make  loans,  except  that the  Fund  (1) may lend  portfolio
securities in accordance  with the Fund's  investment  policies up to 33-1/3% of
the  Fund's  total  assets  taken at market  value,  (2) enter  into  repurchase
agreements,  and  (3)  purchase  all  or a  portion  of  an  issue  of  publicly
distributed bonds, debentures or other similar obligations.

3. A Fund cannot purchase the securities of issuers  conducting  their principal
activity in the same industry if, immediately after such purchase,  the value of
its  investments  in such industry would exceed 25% of its total assets taken at
market value at the time of such  investment.  This limitation does not apply to
investments  in  obligations  of the  U.S.  Government  or any of its  agencies,
instrumentalities  or  authorities.  The Funds have  undertaken,  as a matter of
non-fundamental  policy,  to  apply  this  restriction  to 25% or more of  their
assets.

Description of Brokerage Practices

The  brokerage  practices  of the Funds are the same.  One of the  duties of the
Manager  under each  Investment  Advisory  Agreement is to arrange the portfolio
transactions  for  each  Fund.  Each  Investment   Advisory  Agreement  contains
provisions relating to the employment of broker-dealers  ("brokers") to effect a
Fund's  portfolio  transactions.  In doing so, the Manager is  authorized by the
Investment   Advisory  Agreement  to  employ  such   broker-dealers,   including
"affiliated"  brokers, as that term is defined in the Investment Company Act, as
may, in its best judgment based on all relevant factors, implement the policy of
a Fund to obtain,  at  reasonable  expense,  the "best  execution"  (prompt  and
reliable execution at the most favorable price obtainable) of such transactions.
The Manager need not seek  competitive  commission  bidding,  but is expected to
minimize the  commissions  paid to the extent  consistent  with the interest and
policies of a Fund as established by its Board.

Under each Investment  Advisory  Agreement,  the Manager is authorized to select
brokers that provide  brokerage  and/or research  services for a Fund and/or the
other  accounts  over  which  the  Manager  or its  affiliates  have  investment
discretion.  The  commissions  paid to such  brokers may be higher than  another
qualified  broker would have charged,  if a good faith  determination is made by
the  Manager  and the  commission  is fair and  reasonable  in  relation  to the
services provided. Subject to the foregoing considerations, the Manager may also
consider sales of shares of a Fund and other investment companies managed by the
Manager or its affiliates as a factor in the selection of brokers for the Fund's
portfolio transactions.


Subject to the provisions of each Fund's Investment Advisory

                               -34-

<PAGE>



Agreement,  the procedures and rules described  above,  allocations of brokerage
are generally made by the Manager's portfolio traders based upon recommendations
from the Manager's portfolio managers. In certain instances,  portfolio managers
may directly place trades and allocate brokerage, also subject to the provisions
of each  Investment  Advisory  Agreement and the procedures and rules  described
above.  In either  case,  brokerage is allocated  under the  supervision  of the
Manager's  executive officers and the Manager.  Transactions in securities other
than those for which an exchange is the primary  market are generally  done with
principals  or market  makers.  Brokerage  commissions  are paid  primarily  for
effecting  transactions in listed securities or for certain  fixed-income agency
transactions  in the secondary  market and are otherwise paid only if it appears
likely that a better price or execution can be obtained.  Most purchases made by
the Funds are principal  transactions at net prices,  and the Funds incur little
or no brokerage costs.

Please  refer to the  Statement  of  Additional  Information  for each  Fund for
further information on each Fund's brokerage practices.

Expense Ratios and Performance

The ratio of expenses to average annual net assets for LifeSpan  Income Fund for
the fiscal  year  ended  October  31,  1997 for its Class A, Class B and Class C
shares  was 1.45%,  2.18% and  2.20%,  respectively.  The ratio of  expenses  to
average  annual net assets for Bond Fund for the fiscal year ended  December 31,
1997  for  its  Class  A,  Class B and  Class C were  1.27%,  2.02%  and  2.02%,
respectively.  Further  details  are set  forth  above  under  "Comparative  Fee
Tables", and in LifeSpan Income Fund's Annual Report as of October 31, 1997, and
Bond Fund's  Annual  Report as of December 31,  1997,  which are included in the
Statement of Additional  Information.  The performance of the Funds for the 1, 3
and 5 year periods ended December 31, 1997 is set forth in Exhibit B.

Shareholder Services

The  policies  of  LifeSpan  Income  Fund and Bond Fund with  respect to minimum
initial investments and subsequent investments by its shareholders are the same.
Both  LifeSpan  Income Fund and Bond Fund offer the  following  privileges:  (i)
Right of Accumulation,  (ii) Letter of Intent,  (iii)  reinvestment of dividends
and  distributions at net asset value, (iv) net asset value purchases by certain
individuals and entities,  (v) Asset Builder (automatic  investment) Plans, (vi)
Automatic  Withdrawal and Exchange Plans for  shareholders who own shares of the
Fund valued at $5,000 or more,  (vii)  AccountLink  and PhoneLink  arrangements,
(viii)  exchanges of shares for shares of the same class of certain  other Funds
at net asset value, and (ix) telephone redemption and exchange privileges.

Shareholders  may purchase shares through  OppenheimerFunds  AccountLink,  which
links a shareholder account to an account at a bank or financial institution and
enables shareholders to send

                               -35-

<PAGE>



money  electronically  between  those  accounts  to perform a number of types of
account transactions. This includes the purchase of shares through the automated
telephone  system  (PhoneLink).  Exchanges  can  also be made by  telephone,  or
automatically  through  PhoneLink.   After  AccountLink   privileges  have  been
established  with a bank  account,  shares may be  purchased  by telephone in an
amount up to  $100,000.  Shares of either  Fund may be  exchanged  for shares of
certain  Oppenheimer  funds at net asset value per share;  however,  shares of a
particular  class may be  exchanged  only for  shares of the same class of other
Oppenheimer funds.  Shareholders of the Funds may redeem their shares by written
request,  or by  telephone  request in an amount up to $50,000 in any  seven-day
period,  and in the  case of Bond  Fund,  by  using  the  checkwriting  feature.
Shareholders  may  arrange  to  have  share  redemption   proceeds  wired  to  a
pre-designated  account at a U.S. bank or other financial institution that is an
ACH  member,  through  AccountLink.  There  is  no  dollar  limit  on  telephone
redemption   proceeds  sent  to  a  bank  account  when   AccountLink  has  been
established.  Shareholders may also redeem shares  automatically by telephone by
using PhoneLink. Shareholders of each Fund may also have the Transfer Agent send
redemption  proceeds  of $2,500 or more by Federal  Funds  wire to a  designated
commercial  bank  which  is  a  member  of  the  Federal  Reserve  wire  system.
Shareholders of the Funds have up to six months to reinvest  redemption proceeds
of their Class A shares which they  purchase  subject to a sales charge or their
Class B shares on which they paid a contingent deferred sales charge, in Class A
shares of the Funds or other  Oppenheimer  funds without  paying a sales charge.
LifeSpan  Income Fund may redeem  accounts with less than 100 shares.  Bond Fund
may redeem  accounts if the account  value has fallen  below  $1,000 for reasons
other than market value fluctuations.  Both Funds offer Automatic Withdrawal and
Automatic Exchange Plans under certain conditions.

Rights of Shareholders

The shares of each Fund,  including shares of each class,  entitle the holder to
one vote per share on the  election of  directors  of the Company or trustees of
the Trust, as the case my be, and all other matters submitted to shareholders of
the  Fund.   Each  share  of  the  Fund  represents  an  interest  in  the  Fund
proportionately  equal to the interest of each other share of the same class and
entitle the holder to one vote per share (and a fractional vote for a fractional
share)  on  matters   submitted  to  their  vote  at   shareholders'   meetings.
Shareholders  of each Fund vote  together in the  aggregate  and not by class or
series on certain  matters at  shareholders'  meetings,  such as the election of
Directors or Trustees,  as the case may be, and  ratification  of appointment of
auditors.  Shareholders  of a  particular  series or class  vote  separately  on
proposals  which affect that series or class,  and  shareholders  of a series or
class  which is not  affected  by that  matter are not  entitled  to vote on the
proposal.  For example,  only shareholders of a series,  such as LifeSpan Income
Fund,  vote  exclusively on any material  amendment to the  Investment  Advisory
Agreement with respect to the series. Shares of a particular class vote together
on matters that affect that class. Only shareholders

                               -36-

<PAGE>



of a class of a series vote on certain  amendments  to the  Distribution  and/or
Service  Plans if the  amendments  affect only that class.  Each Fund's Board is
authorized  to create new series and classes of series.  Each  Fund's  Board may
reclassify  unissued  shares of the Funds into  additional  series or classes of
shares.  Each Fund's Board may also divide or combine the shares of a class into
a greater or lesser number of shares without thereby changing the  proportionate
beneficial interest of a shareholder in each Fund. Shares do not have cumulative
voting  rights or  preemptive  or  subscription  rights.  Shares may be voted in
person  or by  proxy.  Each  share has one vote at  shareholder  meetings,  with
fractional  shares voting  proportionately.  Most  amendments to the Articles of
Incorporation in the case of LifeSpan Income Fund or Declaration of Trust in the
case of Bond Fund require the approval of a "majority" of the outstanding voting
securities  (as  defined in the  Investment  Company  Act) of the  Company's  or
Trust's shares without regard to series or class.

Class A,  Class B and Class C shares of  LifeSpan  Income  Fund and the Class A,
Class B and Class C shares of Bond Fund which LifeSpan Income Fund  shareholders
will receive in the Reorganization  participate  equally in the Funds' dividends
and distributions  and in the Funds' net assets upon  liquidation,  after taking
into  account  the  different  expenses  paid by each class.  Distributions  and
dividends for each class will be different and Class B and Class C dividends and
distributions will be lower than Class A dividends.

It is  not  contemplated  that  the  Trust  or  Company  will  hold
regular
annual meetings of shareholders.  Under the Investment Company Act, shareholders
of  LifeSpan  Income  Fund do not have  rights of  appraisal  as a result of the
transactions  contemplated by the Reorganization  Agreement.  However, they have
the right at any time prior to the  consummation  of such  transaction to redeem
their shares at net asset value, less any applicable  contingent  deferred sales
charge.  Shareholders  of  both of the  Funds  have  the  right,  under  certain
circumstances,  to remove a Director or Trustee, as the case may be, and will be
assisted in communicating with other shareholders for such purpose.

LifeSpan  Income  Fund  is a  series  of the  Company,  which  is a  corporation
organized  under  the  laws of the  state  of  Maryland.  As a  general  matter,
shareholders  of a  corporation  will not be  liable to the  corporation  or its
creditors  with respect to their  interests in the  corporation as long as their
shares  have been paid for and the  requisite  corporate  formalities  have been
observed,  both in the organization of the corporation and in the conduct of its
business. Under Massachusetts law, shareholders of Bond Fund which is a business
trust,  could,  under certain  circumstances,  be held personally liable for the
obligations of the business trust. However, the Declaration of Trust under which
the  Trust  was  established   disclaims   shareholder  liability  for  acts  or
obligations of the Fund and requires that notice of such  disclaimer be given in
each agreement, obligation or instrument entered into or executed by the Fund or
the Trustees. The Declaration of Trust provides for

                               -37-

<PAGE>



indemnification  out of the Trust's  property for all losses and expenses of any
shareholder  held  personally  liable for the obligation of the Fund.  Thus, the
risk of a  shareholder  incurring  financial  loss  on  account  of  shareholder
liability is considered remote since it is limited to circumstances in which the
Trust would be unable to meet its  obligations.  A substantial  number of mutual
funds in the United States are organized as Massachusetts business trusts.

Organization and History

Oppenheimer Series Fund, Inc. was organized in 1981 as a multi-
series Maryland corporation. LifeSpan Income Fund is a series of
that  Company.  Oppenheimer  Integrity  Funds was organized in 1982
as
a   multi-series   Massachusetts   business  trust  and  Bond  Fund
currently
is the only  series  of that  Trust.  Oppenheimer  Integrity  Funds
is
governed  by a Board of  Trustees.  Oppenheimer  Series  Fund  Inc.
and
Oppenheimer Integrity Funds are open-end, diversified management
investment companies.  Oppenheimer Integrity Funds have an
unlimited number of authorized shares of beneficial interest.
Oppenheimer   Series  Fund,   Inc.   presently   has  five  series,
including
the Fund.  Oppenheimer  Series  Fund,  Inc.  is governed by a Board
of
Directors.

Management and Distribution Arrangements

The Manager,  located at Two World Trade Center,  New York, New York 10048-0203,
acts as the investment  adviser for both LifeSpan Income Fund and Bond Fund. The
terms and  conditions  of the  Investment  Advisory  Agreement for each Fund are
substantially  the same.  The monthly  management  fee payable to the Manager by
each Fund and 12b-1  Distribution  and Service  Plan fees paid by each Fund with
respect to Class A, Class B and Class C shares are set forth  under  "Synopsis -
Investment  Advisory and Distribution and Service Plan Fees" along with the fees
paid by the Manager to the Subadviser for LifeSpan Income Fund.

Pursuant to each  Investment  Advisory  Agreement,  the Manager  supervises  the
investment operations of the Funds and the composition of their portfolios,  and
furnishes  advice and  recommendations  with respect to investments,  investment
policies and the  purchase  and sale of  securities.  Both  Investment  Advisory
Agreements  require  the Manager to provide  LifeSpan  Income Fund and Bond Fund
with  adequate  office  space,  facilities  and  equipment  and to  provide  and
supervise the activities of all  administrative  and clerical personnel required
to provide effective administration for the Funds, including the compilation and
maintenance of records with respect to their  operations,  the  preparation  and
filing of specified reports, and composition of proxy materials and registration
statements for continuous public sale of shares of each Fund.

BEA acts as  Subadviser  to LifeSpan  Income Fund.  The  Subadviser
is

                               -38-

<PAGE>



responsible  for  choosing  the Fund's  investments  and its duties
and
responsibilities   are  set  forth  in  the   agreement   with  the
Manager.
The Manager, not LifeSpan Income Fund, pays the Subadviser.  BEA began providing
management  services  to  institutional  clients in 1984.  BEA is a  partnership
between Credit Suisse Capital Corporation and CS Advisors Corp.

Expenses not expressly assumed by the Manager under each Fund's
Investment    Advisory    Agreement    or    by    OppenheimerFunds
Distributor,
Inc.,   the  Funds'   distributor   (the   "Distributor"),   under  the  General
Distributor's   Agreement  are  paid  by  the  Funds.  The  Investment  Advisory
Agreements list examples of expenses paid by the Funds,  the major categories of
which  relate  to  interest,  taxes,  brokerage  commissions,  fees  to  certain
Directors or Trustees,  as the case may be, legal and audit expenses,  custodian
and  transfer  agent  expenses,  share  issuance  costs,  certain  printing  and
registration costs and non-recurring  expenses,  including litigation costs. The
management  fee paid by LifeSpan  Income Fund for the fiscal year ended  October
31,  1997 was  $212,649.  For the  fiscal  year ended  December  31,  1997,  the
management fee paid by Bond Fund was $1,751,986.

The Funds' Investment Advisory Agreements contain no expense
limitation.

The Manager is controlled by Oppenheimer  Acquisition  Corp., a holding  company
owned in part by senior  management of the Manager and ultimately  controlled by
Massachusetts  Mutual Life Insurance  Company,  a mutual life insurance  company
that also  advises  pension  plans and  investment  companies.  The  Manager has
operated  as an  investment  company  adviser  since  1959.  The Manager and its
affiliates  currently  advise  investment  companies  with  combined  net assets
aggregating over $75 billion as of December 31, 1997, with more than 3.5 million
shareholder accounts. OppenheimerFunds Services, a division of the Manager, acts
as transfer and  shareholder  servicing  agent on an at-cost  basis for LifeSpan
Income Fund and Bond Fund and for certain  other  open-end  Funds managed by the
Manager and its affiliates.

The Distributor,  under a General Distributor's Agreement for each of the Funds,
acts as the principal  underwriter in the continuous public offering of Class A,
Class B and Class C shares of each Fund.  During  LifeSpan  Income Fund's fiscal
year ended October 31, 1997,  the  aggregate  sales charges on sales of LifeSpan
Income  Fund's  Class A shares were  $19,537,  of which the  Distributor  and an
affiliated  broker-dealer  retained in the aggregate  $13,796.  During  LifeSpan
Income Fund's fiscal year ended October 31,1997,  the contingent  deferred sales
charges  collected on LifeSpan Income Fund's Class B shares totaled $5,923,  all
of which the  Distributor  retained.  During  LifeSpan Income Fund's fiscal year
ended October 31, 1997 there were no contingent deferred sales charges collected

                               -39-

<PAGE>



on the Fund's Class C shares.  For the fiscal year ended  December 31, 1997, the
aggregate  amount of sales  charges on sales of Bond  Fund's  Class A shares was
$346,782,  of which $134,951 was retained by the  Distributor  and an affiliated
broker-dealer. Contingent deferred sales charges collected by the Distributor on
the  redemption of Class B and Class C shares for the fiscal year ended December
31, 1997 totaled $156,781 and $1,757, respectively, all of which was retained by
the Distributor.  For additional  information  about  distribution of the Funds'
shares and the payments made by the Funds to the  Distributor in connection with
such activities, please refer to "Distribution and Service Plans" in each Fund's
Statement of Addition Information.

Purchase of Additional Shares

Class A shares of LifeSpan  Income Fund may be purchased  with an initial  sales
charge of 5.75% for purchases of less than $25,000. The sales charge of 5.75% is
reduced for  purchases  of LifeSpan  Income  Fund's Class A shares of $25,000 or
more.  Class A shares of Bond Fund may be purchased with an initial sales charge
of 4.75% for  purchases  of less  than  $50,000.  The  sales  charge of 4.75% is
reduced  for  purchases  of Bond Fund's  Class A shares of $50,000 or more.  The
sales  charges for larger  purchases  of Bond Fund's Class A shares are slightly
lower than similar  purchases of LifeSpan Income Fund's shares and sales charges
for each Fund are listed in each Fund's  prospectus.  For  purchases  of Class A
shares of either fund of $1 million or more  ($500,000 or more for  purchases by
"Retirement  Plans",  as defined in each Fund's  prospectus) if those shares are
redeemed within 12 calendar months (18 months for shares  purchased prior to May
1,  1997)  of the end of the  calendar  month of their  purchase,  a  contingent
deferred  sales charge may be deducted  from the  redemption  proceeds.  Class B
shares of LifeSpan Income Fund and Bond Fund are sold at net asset value without
an initial sales charge,  however, if Class B shares of either Fund are redeemed
within  six  years  of the  end of the  calendar  month  of  their  purchase,  a
contingent deferred sales charge may be deducted of up to 5%, depending upon how
long such shares had been held.  Class C shares of either Fund may be  purchased
without an initial sales charge,  but if sold within 12 months of buying them, a
contingent deferred sales charge of 1% may be deducted.

The initial sales charge and contingent deferred sales charge on Class A shares,
Class B shares and Class C shares of Bond Fund will only affect  shareholders of
LifeSpan Income Fund to the extent that they desire to make additional purchases
of shares of Bond Fund in  addition to the shares  which they will  receive as a
result  of the  Reorganization.  The  Class A,  Class B and Class C shares to be
issued  under the  Reorganization  Agreement  will be issued by Bond Fund at net
asset value.  Future  dividends and capital gain  distributions of Bond Fund, if
any, may be reinvested  without  sales charge.  The  contingent  deferred  sales
charge for each class of

                               -40-

<PAGE>



shares  for both  Funds is the  same.  If Class A,  Class B or Class C shares of
LifeSpan  Income  Fund are  currently  subject to a  contingent  deferred  sales
change,  the Bond Fund shares issued in the  Reorganization  will continue to be
subject to the same contingent  deferred sales charge.  Any LifeSpan Income Fund
shareholder who is entitled to a reduced sales charge on additional purchases by
reason of a Letter of Intent or Right of  Accumulation  based upon  holdings  of
shares of LifeSpan  Income Fund will  continue to be entitled to a reduced sales
charge on any future purchase of shares of Bond Fund.

Dividends and Distributions

LifeSpan  Income Fund  declares  dividends  from net  investment  income on each
regular business day and pays such dividends to shareholders  monthly.  LifeSpan
Income Fund may also make  distributions  annually  in  December  out of any net
short-term or long-term capital gains. Bond Fund declares and pays dividends and
capital gains distributions, if any, monthly. For both Funds, dividends are paid
separately for each class of shares and normally the dividends on Class A shares
are generally  expected to be higher than for Class B and Class C shares because
the expenses  allocable  to Class B and Class C shares will  generally be higher
than for Class A shares.

From time to time,  Bond Fund may adopt the practice,  to the extent  consistent
with the  amount of the  Fund's net  investment  income and other  distributable
income,  of attempting  to pay dividends on Class A shares at a constant  level,
although  the amount of such  dividends  may be  subject to change  from time to
time,  depending  on  market  conditions,  the  composition  of the Bond  Fund's
portfolio and expenses borne by the Bond Fund or borne separately by that Class.
A practice of attempting to pay dividends on Class A shares at a constant  level
would require the Manager,  consistent with the Fund's investment  objective and
investment  restrictions,  to monitor  the Fund's  portfolio  and select  higher
yielding securities when deemed appropriate to maintain necessary net investment
income levels.  If Bond Fund, from time to time, seeks to pay dividends on Class
A shares at a target level,  Bond Fund anticipates it would pay dividends at the
target dividend level from net investment income and other distributable  income
without any impact on Bond Fund's  Class A net asset value per share.  The Board
of Trustees of Bond Fund could change the Fund's targeted  dividend level at any
time,  without  prior notice to  shareholders.  There is no target  dividend for
Class B or Class C  shares  and  Bond  Fund  would  not  otherwise  have a fixed
dividend  rate.  Regardless,  there can be no assurance as to the payment of any
dividends or the  realization of any capital  gains.  There is no fixed dividend
rate for LifeSpan Income Fund and there can be no assurance that LifeSpan Income
Fund will pay any dividends or distributions.


                               -41-

<PAGE>




             METHOD OF CARRYING OUT THE REORGANIZATION

The  consummation  of  the  transactions   contemplated  by  the  Reorganization
Agreement is  contingent  upon the receipt of an order from the  Securities  and
Exchange Commission  exempting the Funds from the provisions of Section 17(a) of
the Investment  Company Act of 1940, the approval of the  Reorganization  by the
shareholders  of  LifeSpan  Income  Fund and the  receipt  of the  opinions  and
certificates set forth in Sections 10 and 11 of the Reorganization Agreement and
the  occurrence  of  the  events   described  in  those   Sections.   Under  the
Reorganization  Agreement, all the assets of LifeSpan Income Fund, excluding the
Cash  Reserve,  will be  delivered to Bond Fund in exchange for Class A, Class B
and Class C shares of Bond Fund.  The Cash  Reserve to be  retained  by LifeSpan
Income Fund will be sufficient in the discretion of the Board for the payment of
LifeSpan  Income Fund's  liabilities,  and LifeSpan  Income  Fund's  expenses of
liquidation.

Assuming the  shareholders of LifeSpan  Income Fund approve the  Reorganization,
the actual  exchange of assets is expected to take place on June 12, 1998, or as
soon thereafter as is practicable (the "Closing Date") on the basis of net asset
values as of the close of business on the  business  day  preceding  the Closing
Date (the "Valuation Date"). Under the Reorganization Agreement, all redemptions
of shares of LifeSpan Income Fund shall be permanently suspended at the close of
business on the Valuation Date; only redemption requests received in proper form
on or prior to the close of  business  on that date  shall be  fulfilled  by it;
redemption  requests  received by  LifeSpan  Income Fund after that date will be
treated as  requests  for  redemptions  of Class A, Class B or Class C shares of
Bond Fund to be  distributed  to the  shareholders  requesting  redemption.  The
exchange  of assets  for  shares  will be done on the basis of the per share net
asset  value of the Class A,  Class B and Class C shares of Bond  Fund,  and the
value of the assets of LifeSpan Income Fund to be transferred as of the close of
business on the  Valuation  Date,  valued in the manner used by Bond Fund in the
valuation  of  assets.  Bond  Fund is not  assuming  any of the  liabilities  of
LifeSpan Income Fund, except for portfolio  securities  purchased which have not
settled and outstanding shareholder redemption and dividend checks.

The net asset value of the shares  transferred  by Bond Fund to LifeSpan  Income
Fund will be the same as the value of the  assets  received  by Bond  Fund.  For
example, if, on the Valuation Date, LifeSpan Income Fund were to have securities
with a market  value of  $95,000  and cash in the  amount of  $10,000  (of which
$5,000 was to be  retained by it as the Cash  Reserve),  the value of the assets
which  would be  transferred  to Bond Fund would be  $100,000.  If the net asset
value per share of Bond Fund were $10 per share at the close of  business on the
Valuation Date, the number of shares to be

                                42

<PAGE>



issued would be 10,000  ($100,000 / $10). These 10,000 shares of Bond Fund would
be distributed to the former  shareholders of LifeSpan Income Fund. This example
is given for  illustration  purposes only and does not bear any  relationship to
the dollar amounts or shares expected to be involved in the Reorganization.

Following the Closing Date,  LifeSpan  Income Fund will distribute on a pro rata
basis to its  shareholders  of record on the Valuation Date the Class A, Class B
and Class C shares of Bond Fund received by LifeSpan Income Fund at the Closing,
in  liquidation  of the  outstanding  shares of LifeSpan  Income  Fund,  and the
outstanding shares of LifeSpan Income Fund will be canceled.  To assist LifeSpan
Income  Fund  in  this  distribution,  Bond  Fund  will,  in  accordance  with a
shareholder  list supplied by LifeSpan Income Fund,  cause its transfer agent to
credit  and  confirm  an  appropriate  number  of  shares  of Bond  Fund to each
shareholder  of LifeSpan  Income Fund.  Certificates  for Class A shares of Bond
Fund will be issued upon  written  request of a former  shareholder  of LifeSpan
Income Fund but only for whole  shares with  fractional  shares  credited to the
name of the shareholder on the books of Bond Fund and only if shares represented
by certificates are delivered for  cancellation.  Former Class A shareholders of
LifeSpan  Income Fund who wish  certificates  representing  their shares of Bond
Fund must,  after  receipt  of their  confirmations,  make a written  request to
OppenheimerFunds  Services, P.O. Box 5270, Denver, Colorado 80217.  Shareholders
of LifeSpan Income Fund holding certificates  representing their shares will not
be required to surrender  their  certificates  to anyone in connection  with the
Reorganization. After the Reorganization, however, it will be necessary for such
shareholders to surrender such certificates in order to redeem, transfer, pledge
or exchange any shares of Bond Fund.

Under the  Reorganization  Agreement,  within one year after the  Closing  Date,
LifeSpan  Income Fund  shall:  (a) either pay or make  provision  for all of its
debts and taxes;  and (b) either (i) transfer any  remaining  amount of the Cash
Reserve to Bond Fund,  if such  remaining  amount is not  material  (as  defined
below) or (ii) distribute such remaining  amount to the shareholders of LifeSpan
Income Fund who were such on the Valuation Date. Such remaining  amount shall be
deemed to be  material  if the amount to be  distributed,  after  deducting  the
estimated expenses of the distribution,  equals or exceeds one cent per share of
the number of LifeSpan  Income Fund shares  outstanding  on the Valuation  Date.
Within one year after the Closing Date,  LifeSpan  Income Fund will complete its
liquidation.

The  obligations of either LifeSpan Income Fund or Bond Fund under the Agreement
shall be subject to  obtaining  the  necessary  relief from the  Securities  and
Exchange Commission and to the right of either Fund to abandon and terminate the
Reorganization Agreement for any reason and without liability provided, however,
that if the

                                43

<PAGE>



party   terminating  the  Agreement  does  so  without   reasonable  cause,  the
terminating  party  shall,  upon  demand,  reimburse  the  other  party  for all
expenses,  including  reasonable  out-of-pocket  expenses  and fees  incurred in
connection with the Agreement.

In  the   event   that   the   Reorganization   Agreement   is  not
consummated
for any reason, the Board will consider and may submit to the
shareholders other alternatives.

                      ADDITIONAL INFORMATION

Financial Information

The  Reorganization  will be accounted  for by the  surviving  Fund
in
its   financial   statements   similar   to   a   pooling   without
restatement.
Further  financial  information  as to LifeSpan  Income Fund is contained in its
current  Prospectus,  which is available  without  charge from  OppenheimerFunds
Services,  the Transfer Agent,  P.O. Box 5270,  Denver,  Colorado 80217,  and is
incorporated  herein by  reference,  and in its Annual  Report as of October 31,
1997,  which is included in its Statement of Additional  Information.  Financial
information  for Bond Fund is contained in its current  Prospectus  accompanying
this Proxy Statement and Prospectus and incorporated herein by reference, and in
its Annual  Report as of December 31, 1997 which is included in its Statement of
Additional Information.

Public Information

Additional information about LifeSpan Income Fund and Bond Fund is available, as
applicable,  in  the  following  documents  which  are  incorporated  herein  by
reference:  (i) Bond Fund's  Prospectus dated April 30, 1997  accompanying  this
Proxy Statement and incorporated  herein; (ii) LifeSpan Income Fund's Prospectus
dated  February 19,  1998,  which may be obtained  without  charge by writing to
OppenheimerFunds  Services,  P.O. Box 5270,  Denver,  Colorado 80217; (iii) Bond
Fund's  Annual  Report as of December  31, 1997,  which may be obtained  without
charge by writing to  OppenheimerFunds  Services at the address indicated above;
and (iv) LifeSpan Income Fund's Annual Report as of October 31, 1997,  which may
be  obtained  without  charge by writing  to  OppenheimerFunds  Services  at the
address  indicated  above.  All of the  foregoing  documents  may be obtained by
calling  the  toll-free  number  on  the  cover  of  this  Proxy  Statement  and
Prospectus.

Additional information about the following matters is contained in the Statement
of Additional Information relating to this Reorganization, which incorporates by
reference  the Bond Fund  Statement of  Additional  Information  dated April 30,
1997,  and  LifeSpan  Income  Fund's  Prospectus  and  Statement  of  Additional
Information dated February 19, 1998; the organization and operation of Bond Fund
and LifeSpan Income Fund; more information on

                                44

<PAGE>



investment  policies,  practices  and risks;  information  about the the Trust's
Board and the Company's Board and their respective  responsibilities;  a further
description of the services  provided by Bond Fund's and LifeSpan  Income Fund's
Manager,  Distributor,  and transfer and shareholder  servicing agent;  dividend
policies;  tax matters; an explanation of the method of determining the offering
price of the shares and/or contingent  deferred sales charges,  as applicable of
Class A,  Class B and  Class C shares  of Bond Fund and  LifeSpan  Income  Fund;
purchase,  redemption and exchange programs; the different expenses paid by each
class of shares; and distribution arrangements.

The Trust on behalf of Bond Fund and the  Company of behalf of  LifeSpan  Income
Fund are subject to the  informational  requirements of the Securities  Exchange
Act of 1934,  as amended,  and in accordance  therewith,  file reports and other
information with the SEC. Proxy material,  reports and other  information  about
LifeSpan  Income Fund and Bond Fund which are of public  record can be inspected
and copied at public reference  facilities  maintained by the SEC in Washington,
D.C. and certain of its regional  offices,  and copies of such  materials can be
obtained  at  prescribed  rates  from the  Public  Reference  Branch,  Office of
Consumer Affairs and Information Services, SEC, Washington, D.C. 20549.

                          OTHER BUSINESS

Management of LifeSpan  Income Fund knows of no business  other than the matters
specified above which will be presented at the
Meeting.
Since  matters  not known at the time of the  solicitation  may come  before the
Meeting, the proxy as solicited confers discretionary  authority with respect to
such matters as properly come before the Meeting,  including any  adjournment or
adjournments  thereof,  and  it  is  the  intention  of  the  persons  named  as
attorneys-in-fact  in the  proxy to vote this  proxy in  accordance  with  their
judgment on such matters.


By Order of the Board of Directors



Andrew J. Donohue, Secretary


April 6, 1998                                                   305


                                45

<PAGE>



                             EXHIBIT A

               AGREEMENT AND PLAN OF REORGANIZATION


      AGREEMENT  AND  PLAN  OF  REORGANIZATION  (the  "Agreement")  dated  as of
___________,  by and between Oppenheimer LifeSpan Income  Fund("LifeSpan  Income
Fund"), a series of Oppenheimer Series
Fund,
Inc.,  a  Maryland   corporation  (the   "Company"),and  Bond  Fund
("Bond
Fund"), a series of Oppenheimer Integrity Funds, a Massachusetts
business trust (the "Trust").

                       W I T N E S S E T H:

      WHEREAS, the parties are each a series of an open-end
investment company of the management type; and

      WHEREAS,  the  parties  hereto  desire to provide  for the  reorganization
pursuant to Section  368(a)(1) of the Internal  Revenue Code of 1986, as amended
(the "Code"),  of LifeSpan  Income Fund through the  acquisition by Bond Fund of
substantially  all of the assets of LifeSpan  Income  Fund in  exchange  for the
voting shares of beneficial  interest ("shares") of Class A, Class B and Class C
shares of Bond Fund and the  assumption by Bond Fund of certain  liabilities  of
LifeSpan Income Fund, which Class A, Class B and Class C shares of Bond Fund are
to be  distributed  by  LifeSpan  Income  Fund pro rata to its  shareholders  in
complete  liquidation of LifeSpan  Income Fund and complete  cancellation of its
shares;

      NOW, THEREFORE,  in consideration of the mutual promises herein contained,
the parties hereto agree as follows:

     1.  The  parties   hereto   hereby  adopt  this   Agreement   and  Plan  of
Reorganization (the "Agreement") pursuant to Section
368(a)(1)
of the Code as follows:  The reorganization will be comprised of the acquisition
by Bond Fund of  substantially  all of the  properties  and  assets of  LifeSpan
Income Fund in exchange for Class A, Class B and Class C shares of Bond Fund and
the  assumption  by Bond Fund of certain  liabilities  of LifeSpan  Income Fund,
followed by the distribution of such Class A, Class B and Class C shares of Bond
Fund shares to the Class A, Class B and Class C shareholders  of LifeSpan Income
Fund in  exchange  for their  Class A,  Class B and  Class C shares of  LifeSpan
Income Fund, all upon and subject to the terms of the Agreement  hereinafter set
forth.

           The share transfer books of LifeSpan  Income Fund will be permanently
closed at the close of business on the Valuation Date (as  hereinafter  defined)
and only redemption requests received in proper form on or prior to the close of
business on the  Valuation  Date shall be  fulfilled  by LifeSpan  Income  Fund;
redemption requests received by LifeSpan Income Fund after that date shall be

                                A-1

<PAGE>



treated  as  requests  for the  redemption  of the  shares  of Bond
Fund
to be distributed to the shareholder in question as provided in
Section 5.

     2. On the  Closing  Date (as  hereinafter  defined),  all of the  assets of
LifeSpan Income Fund on that date, excluding a cash reserve (the "Cash Reserve")
to be retained by LifeSpan  Income Fund  sufficient  in its  discretion  for the
payment  of  the  expenses  of  LifeSpan  Income  Fund's   dissolution  and  its
liabilities,  but not in excess of the amount contemplated by Section 10E, shall
be delivered as provided in Section 8 to Bond Fund,  in exchange for and against
delivery  to LifeSpan  Income  Fund on the Closing  Date of a number of Class A,
Class B and Class C shares of Bond Fund,  having an  aggregate  net asset  value
equal to the value of the assets of  LifeSpan  Income  Fund so  transferred  and
delivered.

     3. The net asset  value of Class A, Class B and Class C shares of Bond Fund
and the value of the assets of LifeSpan  Income Fund to be transferred  shall in
each  case be  determined  as of the  close of  business  of the New York  Stock
Exchange on the Valuation  Date.  The  computation of the net asset value of the
Class A,  Class B and Class C shares  of Bond Fund and the Class A,  Class B and
Class C shares of LifeSpan  Income Fund shall be done in the manner used by Bond
Fund and LifeSpan  Income Fund,  respectively,  in the  computation  of such net
asset value per share as set forth in their respective prospectuses. The methods
used by Bond Fund in such  computation  shall be applied to the valuation of the
assets of LifeSpan Income Fund to be transferred to Bond Fund.

           LifeSpan Income Fund shall declare and pay,  immediately prior to the
Valuation Date, a dividend or dividends  which,  together with all previous such
dividends,  shall have the effect of  distributing  to  LifeSpan  Income  Fund's
shareholders all of LifeSpan Income Fund's investment company taxable income for
taxable years ending on or prior to the Closing Date (computed without regard to
any dividends paid) and all of its net capital gain, if any, realized in taxable
years  ending on or prior to the Closing Date (after  reduction  for any capital
loss carry-forward).

     4. The closing (the "Closing") shall be at the offices of OppenheimerFunds,
Inc. (the  "Agent"),  Two World Trade  Center,  34th Floor,  New York,  New York
10048,  at 4:00 P.M.  New York time on June 12,  1998 or at such  other  time or
place as the parties may designate or as provided  below (the  "Closing  Date").
The business day  preceding the Closing Date is  hereinafter  referred to as the
"Valuation Date."

     In the event that on the Valuation  Date either party has,  pursuant to the
Investment Company Act of 1940, as amended (the "Act"), or any rule,  regulation
or order thereunder, suspended the redemption of its shares or postponed payment
therefore, the

                                A-2

<PAGE>



Closing Date shall be postponed until the first business day after the date when
both parties have ceased such  suspension or  postponement;  provided,  however,
that if such  suspension  shall  continue  for a period  of 60 days  beyond  the
Valuation  Date,  then the other party to the  Agreement  shall be  permitted to
terminate the Agreement without liability to either party for such termination.

     5. In conjunction  with the Closing,  LifeSpan Income Fund shall distribute
on a pro rata basis to the shareholders of LifeSpan Income Fund on the Valuation
Date the Class A, Class B and Class C shares of Bond Fund  received  by LifeSpan
Income Fund on the Closing  Date in exchange  for the assets of LifeSpan  Income
Fund in complete  liquidation  of LifeSpan  Income Fund;  for the purpose of the
distribution  by LifeSpan  Income Fund of Class A, Class B and Class C shares of
Bond Fund to its shareholders,  Bond Fund will promptly cause its transfer agent
to: (a) credit an  appropriate  number of Class A, Class B and Class C shares of
Bond  Fund on the  books  of Bond  Fund to each  Class  A,  Class B and  Class C
shareholder, respectively of LifeSpan Income Fund in accordance with a list (the
"Shareholder List") of its shareholders  received from LifeSpan Income Fund; and
(b) confirm an appropriate number of Class A, Class B and Class C shares of Bond
Fund to each  shareholder  of LifeSpan  Income Fund;  certificates  for Class A,
Class B and Class C shares of Bond Fund will be issued upon written request of a
former  shareholder  of  LifeSpan  Income Fund but only for whole  shares,  with
fractional  shares  credited to the name of the shareholder on the books of Bond
Fund.

           The Shareholder  List shall indicate,  as of the close of business on
the Valuation Date, the name and address of each  shareholder of LifeSpan Income
Fund, indicating his or her share balance. LifeSpan Income Fund agrees to supply
the Shareholder List to Bond Fund not later than the Closing Date.  Shareholders
of LifeSpan Income Fund holding certificates representing their shares shall not
be required to surrender  their  certificates  to anyone in connection  with the
reorganization.  After the Closing Date,  however, it will be necessary for such
shareholders  to surrender their  certificates  in order to redeem,  transfer or
pledge the shares of Bond Fund which they received.

     6. Within one year after the Closing Date,  LifeSpan  Income Fund shall (a)
either pay or make  provision for payment of all of its  liabilities  and taxes,
and (b) either (i)  transfer  any  remaining  amount of the Cash Reserve to Bond
Fund, if such remaining amount (as reduced by the estimated cost of distributing
it to  shareholders)  is not material (as defined below) or (ii) distribute such
remaining  amount to the  shareholders  of LifeSpan Income Fund on the Valuation
Date.  Such remaining  amount shall be deemed to be material if the amount to be
distributed,  after  deduction of the  estimated  expenses of the  distribution,
equals or

                                A-3

<PAGE>



exceeds  one cent per share of  LifeSpan  Income  Fund  outstanding
on
the Valuation Date.

     7. Prior to the  Closing  Date,  there  shall be  coordination  between the
parties as to their respective  portfolios so that, after the Closing, Bond Fund
will be in  compliance  with all of its  investment  policies and  restrictions.
Promptly after the
Closing,
LifeSpan  Income  Fund shall  deliver to Bond Fund two copies of a list  setting
forth the  securities  then owned by LifeSpan  Income Fund.  Promptly  after the
Closing,  LifeSpan  Income Fund shall provide Bond Fund a list setting forth the
respective federal income tax bases thereof.

     8.  Portfolio  securities  or written  evidence  acceptable to Bond Fund of
record ownership  thereof by The Depository Trust Company or through the Federal
Reserve Book Entry System or any other  depository  approved by LifeSpan  Income
Fund  pursuant to Rule 17f-4 and Rule 17f-5 under the Act shall be endorsed  and
delivered,  or transferred by appropriate transfer or assignment  documents,  by
LifeSpan  Income Fund on the Closing Date to Bond Fund, or at its direction,  to
its  custodian  bank,  in  proper  form for  transfer  in such  condition  as to
constitute  good delivery  thereof in accordance  with the custom of brokers and
shall be accompanied by all necessary  state transfer  stamps,  if any. The cash
delivered shall be in the form of certified or bank cashiers'  checks or by bank
wire or intra-bank transfer payable to the order of Bond Fund for the account of
Bond Fund.  Shares of Bond Fund  representing  the number of shares of Bond Fund
being delivered  against the assets of LifeSpan  Income Fund,  registered in the
name of LifeSpan  Income Fund,  shall be transferred to LifeSpan  Income Fund on
the Closing  Date.  Such shares shall  thereupon be assigned by LifeSpan  Income
Fund to its  shareholders  so that the shares of Bond Fund may be distributed as
provided in Section 5.

           If,  at the  Closing  Date,  LifeSpan  Income  Fund is  unable in the
ordinary  course of business to make delivery  under this Section 8 to Bond Fund
of any of its  portfolio  securities  or cash  for the  reason  that any of such
securities  purchased by LifeSpan Income Fund, or the cash proceeds of a sale of
portfolio  securities,  prior to the Closing Date have not yet been delivered to
it or LifeSpan Income Fund's custodian,  then the delivery  requirements of this
Section 8 with respect to said undelivered securities or cash will be waived and
LifeSpan  Income Fund will  deliver to Bond Fund by or on the  Closing  Date and
with  respect  to said  undelivered  securities  or cash  executed  copies of an
agreement or agreements of assignment in a form reasonably  satisfactory to Bond
Fund, together with such other documents,  including a due bill or due bills and
brokers' confirmation slips as may reasonably be required by Bond Fund.



                                A-4

<PAGE>



     9. Bond  Fund  shall not  assume  the  liabilities  (except  for  portfolio
securities  purchased which have not settled and for shareholder  redemption and
dividend  checks  outstanding) of LifeSpan Income Fund, but LifeSpan Income Fund
will, nevertheless,  use its best efforts to discharge all known liabilities, so
far as may be  possible,  prior to the Closing  Date.  The cost of printing  and
mailing the proxies and proxy  statements will be borne by LifeSpan Income Fund.
LifeSpan  Income Fund and Bond Fund will bear the cost of their  respective  tax
opinion. Any documents such as existing  prospectuses or annual reports that are
included in that mailing will be a cost of the Fund  issuing the  document.  Any
other  out-of-pocket  expenses of Bond Fund and LifeSpan  Income Fund associated
with  this  reorganization,  including  legal,  accounting  and  transfer  agent
expenses, will be borne by LifeSpan Income Fund and Bond Fund, respectively,  in
the amounts so incurred by each.

     10. The obligations of Bond Fund hereunder shall be subject
to the following conditions:

           A. The Board of  Trustees  of the Trust  shall  have  authorized  the
execution of the Agreement,  and the  shareholders of LifeSpan Income Fund shall
have approved the  Agreement  and the  transactions  contemplated  thereby,  and
LifeSpan  Income Fund shall have furnished to Bond Fund copies of resolutions to
that effect certified by the Secretary or an Assistant Secretary of the Company;
such shareholder approval shall have been by the affirmative vote of "a majority
of the outstanding voting securities" (as defined in the Act) of LifeSpan Income
Fund at a meeting for which proxies have been  solicited by the Proxy  Statement
and Prospectus (as hereinafter defined).

           B. Bond Fund shall have received an opinion dated the Closing Date of
counsel to LifeSpan  Income Fund, to the effect that (i) LifeSpan Income Fund is
a series of the Company which is a corporation duly organized,  validly existing
and in good standing under the laws of the State of Maryland with full powers to
carry on its business as then being  conducted and to enter into and perform the
Agreement (Maryland counsel may be relied upon for this opinion);  and (ii) that
all action  necessary  to make the  Agreement,  according  to its terms,  valid,
binding and enforceable on LifeSpan Income Fund and to authorize effectively the
transactions  contemplated  by the Agreement have been taken by LifeSpan  Income
Fund.

           C.  The  representations  and  warranties  of  LifeSpan  Income  Fund
contained  herein shall be true and correct at and as of the Closing  Date,  and
Bond Fund shall have been furnished  with a certificate  of the President,  or a
Vice President,  or the Secretary or the Assistant Secretary or the Treasurer of
the Company, dated the Closing Date, to that effect.


                                A-5

<PAGE>



           D. On the Closing Date,  LifeSpan Income Fund shall have furnished to
Bond Fund a certificate  of the Treasurer or Assistant  Treasurer of the Company
as to the amount of the capital loss carry-over and net unrealized  appreciation
or depreciation,  if any, with respect to LifeSpan Income Fund as of the Closing
Date.

           E. The Cash  Reserve  shall  not  exceed  10% of the value of the net
assets,  nor 30% in value of the gross  assets,  of LifeSpan  Income Fund at the
close of business on the Valuation
Date.

           F. A  Registration  Statement on Form N-14 filed by the Company under
the  Securities  Act  of  1933,  as  amended  (the  "1933  Act"),  containing  a
preliminary  form of the Proxy  Statement  and  Prospectus,  shall  have  become
effective under the 1933 Act not
later than July 15, 1998.

           G. On the Closing  Date,  Bond Fund shall have received a letter from
Andrew J. Donohue or other senior executive  officer of  OppenheimerFunds,  Inc.
acceptable  to Bond Fund,  stating that nothing has come to his or her attention
which in his or her judgment  would  indicate  that as of the Closing Date there
were any  material  actual or  contingent  liabilities  of LifeSpan  Income Fund
arising  out of  litigation  brought  against  LifeSpan  Income  Fund or  claims
asserted  against  it,  or  pending  or to the  best  of  his  or her  knowledge
threatened  claims or  litigation  not  reflected  in or apparent  from the most
recent audited  financial  statements and footnotes  thereto of LifeSpan  Income
Fund  delivered  to Bond Fund.  Such  letter may also  include  such  additional
statements  relating to the scope of the review conducted by such person and his
or her  responsibilities  and  liabilities  as are not  unreasonable  under  the
circumstances.

           H. Bond Fund shall have received an opinion,  dated the Closing Date,
of KPMG Peat  Marwick  LLP, to the same effect as the  opinion  contemplated  by
Section 11.E of the Agreement.

           I. Bond Fund shall have  received at the closing all of the assets of
LifeSpan  Income Fund to be conveyed  hereunder,  which assets shall be free and
clear  of  all  liens,  encumbrances,   security  interests,   restrictions  and
limitations whatsoever.

     11. The  obligations of LifeSpan  Income Fund hereunder shall be subject to
the following conditions:

           A. The Board of Directors of the Company  shall have  authorized  the
execution of the Agreement, and the transactions  contemplated thereby, and Bond
Fund shall have furnished to LifeSpan  Income Fund copies of resolutions to that
effect certified by the Secretary or an Assistant Secretary of the Trust.


                                A-6

<PAGE>



           B.  LifeSpan  Income  Fund's  shareholders  shall have  approved  the
Agreement and the transactions contemplated hereby, by an affirmative vote of "a
majority  of the  outstanding  voting  securities"  (as  defined  in the Act) of
LifeSpan  Income Fund,  and LifeSpan  Income Fund shall have furnished Bond Fund
copies of resolutions to that effect  certified by the Secretary or an Assistant
Secretary of the Company.

           C.  LifeSpan  Income Fund shall have  received  an opinion  dated the
Closing  Date of  counsel to Bond  Fund,  to the effect  that (i) Bond Fund is a
series  of the  Trust  which is duly  organized,  validly  existing  and in good
standing under the laws of the Commonwealth of Massachusetts with full powers to
carry on its business as then being  conducted and to enter into and perform the
Agreement  (Massachusetts counsel may be relied upon for this opinion); (ii) all
action necessary to make the Agreement,  according to its terms, valid,  binding
and enforceable  upon Bond Fund and to authorize  effectively  the  transactions
contemplated by the Agreement have been taken by Bond Fund, and (iii) the shares
of Bond Fund to be issued  hereunder are duly authorized and when issued will be
validly  issued,  fully-paid  and  non-assessable,  except  as set forth in Bond
Fund's Registration Statement.

           D. The  representations  and warranties of Bond Fund contained herein
shall be true and correct at and as of the Closing  Date,  and  LifeSpan  Income
Fund shall have been  furnished  with a  certificate  of the  President,  a Vice
President or the  Secretary or an  Assistant  Secretary or the  Treasurer of the
Trust to that effect dated the Closing Date.

           E.  LifeSpan  Income Fund shall have received an opinion of KPMG Peat
Marwick LLP to the effect that the Federal tax  consequences of the transaction,
if carried  out in the manner  outlined  in this Plan of  Reorganization  and in
accordance with (i) LifeSpan Income Fund's  representation that there is no plan
or  intention  by any Fund  shareholder  who owns 5% or more of LifeSpan  Income
Fund's outstanding shares, and, to LifeSpan Income Fund's best knowledge,  there
is no plan or  intention  on the part of the  remaining  Fund  shareholders,  to
redeem,  sell,  exchange  or  otherwise  dispose of a number of Bond Fund shares
received in the transaction that would reduce LifeSpan Income Fund shareholders'
ownership  of Bond Fund shares to a number of shares  having a value,  as of the
Closing Date,  of less than 50% of the value of all of the formerly  outstanding
Fund shares as of the same date, and (ii) the representation by each of LifeSpan
Income Fund and Bond Fund that, as of the Closing Date, LifeSpan Income Fund and
Bond Fund will meet the diversification test of Section  368(a)(2)(F)(ii) of the
Code, will be as follows:

                 1.  The    transactions    contemplated   by   the
Agreement
will  qualify as a  tax-free  "reorganization"  within the  meaning
of

                                A-7

<PAGE>



Section 368(a)(1) of the Code, and under the regulations promulgated thereunder.

                 2.  LifeSpan  Income Fund and Bond Fund will each  qualify as a
"party to a reorganization" within the meaning of Section 368(b)(2) of the Code.

                 3. No gain or loss will be  recognized by the  shareholders  of
LifeSpan Income Fund upon the  distribution of shares of beneficial  interest in
Bond Fund to the shareholders of LifeSpan Income Fund pursuant to Section 354 of
the Code.

                 4.  Under  Section  361(a)  of the Code no gain or loss will be
recognized  by LifeSpan  Income Fund by reason of the transfer of  substantially
all its assets in exchange for shares of
Bond Fund.

                 5.  Under  Section  1032 of the  Code  no gain or loss  will be
recognized by Bond Fund by reason of the transfer of substantially  all LifeSpan
Income Fund's assets in exchange for Class A, Class B and Class C shares of Bond
Fund and Bond Fund's assumption of certain liabilities of LifeSpan Income Fund.

                 6. The  shareholders of LifeSpan Income Fund will have the same
tax  basis and  holding  period  for the  Class A,  Class B or Class C shares of
beneficial  interest  in Bond Fund that they  receive  as they had for  LifeSpan
Income Fund shares that they  previously  held,  pursuant to Section  358(a) and
1223(1), respectively, of the Code.

                 7. The securities  transferred by LifeSpan  Income Fund to Bond
Fund will have the same tax basis and  holding  period in the hands of Bond Fund
as they had for LifeSpan  Income Fund,  pursuant to Section  362(b) and 1223(1),
respectively, of the Code.

           F. The Cash  Reserve  shall  not  exceed  10% of the value of the net
assets,  nor 30% in value of the gross  assets,  of LifeSpan  Income Fund at the
close of business on the Valuation
Date.

           G. A  Registration  Statement on Form N-14 filed by the Company under
the  1933  Act,  containing  a  preliminary  form  of the  Proxy  Statement  and
Prospectus, shall have become effective under
the 1933 Act not later than July 15, 1998.

           H. On the Closing  Date,  LifeSpan  Income Fund shall have received a
letter  from  Andrew  J.   Donohue  or  other   senior   executive   officer  of
OppenheimerFunds,  Inc. acceptable to LifeSpan Income Fund, stating that nothing
has come to his or her  attention  which in his or her judgment  would  indicate
that as of the  Closing  Date  there  were any  material  actual  or  contingent
liabilities of

                                A-8

<PAGE>



Bond Fund arising out of litigation brought against Bond Fund or claims asserted
against  it,  or  pending  or, to the best of his or her  knowledge,  threatened
claims or  litigation  not  reflected in or apparent by the most recent  audited
financial  statements  and footnotes  thereto of Bond Fund delivered to LifeSpan
Income Fund. Such letter may also include such additional statements relating to
the scope of the review conducted by such person and his or her responsibilities
and liabilities as are not unreasonable under the circumstances.

           I. LifeSpan  Income Fund shall  acknowledge  receipt of the shares of
Bond Fund.

     12. The Company on behalf of LifeSpan  Income  Fund hereby  represents  and
warrants that:

           A. The financial statements of LifeSpan Income Fund as at October 31,
1997(audited)  heretofore  furnished to Bond Fund,  present fairly the financial
position,  results of operations,  and changes in net assets of LifeSpan  Income
Fund  as  of  that  date,  in  conformity  with  generally  accepted  accounting
principles  applied on a basis consistent with the preceding year; and that from
October 31, 1997  through the date hereof  there have not been,  and through the
Closing Date there will not be, any material  adverse  change in the business or
financial  condition of LifeSpan Income Fund, it being agreed that a decrease in
the  size of  LifeSpan  Income  Fund  due to a  diminution  in the  value of its
portfolio  and/or  redemption  of its shares shall not be  considered a material
adverse change;

           B.  Contingent  upon approval of the  Agreement and the  transactions
contemplated  thereby by LifeSpan  Income Fund's  shareholders,  LifeSpan Income
Fund has  authority to transfer all of the assets of LifeSpan  Income Fund to be
conveyed  hereunder  free  and  clear  of  all  liens,  encumbrances,   security
interests, restrictions and limitations whatsoever;

           C. The Prospectus, as amended and supplemented, contained in LifeSpan
Income Fund's  Registration  Statement under the 1933 Act, as amended,  is true,
correct and complete,  conforms to the requirements of the 1933 Act and does not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading.  The Registration  Statement, as amended, was, as of the date of the
filing  of the  last  Post-Effective  Amendment,  true,  correct  and  complete,
conformed  to the  requirements  of the 1933 Act and did not  contain any untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the statements therein not misleading;

           D.    There is no material contingent liability of

                                A-9

<PAGE>



LifeSpan Income Fund and no material claim and no material legal, administrative
or other  proceedings  pending or, to the  knowledge  of LifeSpan  Income  Fund,
threatened against LifeSpan Income Fund, not reflected in such Prospectus;

           E.  Except  for  this  Agreement,  there  are no  material  contracts
outstanding to which  LifeSpan  Income Fund is a party other than those ordinary
in the conduct of its business;

           F.  LifeSpan  Income  Fund is a  series  of the  Company  which  is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Maryland;  and has all necessary and material  Federal and state
authorizations  to own all of its  assets  and to carry on its  business  as now
being  conducted;  and the  Company  is duly  registered  under the Act and such
registration has not been rescinded or revoked and is in full force and effect;

           G. All Federal  and other tax returns and reports of LifeSpan  Income
Fund  required  by law to be filed have been  filed,  and all  Federal and other
taxes shown due on said returns and reports  have been paid or  provision  shall
have been  made for the  payment  thereof  and to the best of the  knowledge  of
LifeSpan  Income Fund no such return is currently  under audit and no assessment
has been  asserted  with  respect to such  returns  and to the  extent  such tax
returns with respect to the taxable year of LifeSpan  Income Fund ended  October
31, 1997 have not been filed,  such returns will be filed when  required and the
amount of tax shown as due thereon shall be paid when due; and

           H.  LifeSpan  Income  Fund has  elected to be treated as a  regulated
investment company and, for each fiscal year of its operations,  LifeSpan Income
Fund has met the requirements of Subchapter M of the Code for  qualification and
treatment as a regulated  investment company and LifeSpan Income Fund intends to
meet such requirements with respect to its current taxable year.

     13. The Trust on behalf of Bond Fund hereby represents and warrants that:

           A. The  financial  statements  of Bond Fund as at  December  31, 1997
(audited)  heretofore  furnished  to LifeSpan  Income Fund,  present  fairly the
financial  position,  results of  operations,  and changes in net assets of Bond
Fund,  as of  that  date,  in  conformity  with  generally  accepted  accounting
principles  applied on a basis consistent with the preceding year; and that from
December 31, 1997  through the date hereof there have not been,  and through the
Closing Date there will not be, any material  adverse changes in the business or
financial  condition of Bond Fund,  it being  understood  that a decrease in the
size of Bond  Fund due to a  diminution  in the  value of its  portfolio  and/or
redemption of its

                               A-10

<PAGE>



shares shall not be considered a material or adverse change;

           B. The  Prospectus  contained in the Trust's  Registration  Statement
under the 1933 Act, is true, correct and complete,  conforms to the requirements
of the 1933 Act and does not contain any untrue  statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading.  The Registration  Statement, as amended,
was, as of the date of the filing of the last Post- Effective  Amendment,  true,
correct and complete,  conformed to the requirements of the 1933 Act and did not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading;

           C.  Except  for  this  Agreement,  there  is no  material  contingent
liability  of  Bond  Fund  and  no  material   claim  and  no  material   legal,
administrative or other  proceedings  pending or, to the knowledge of Bond Fund,
threatened against Bond Fund, not reflected in such Prospectus;

           D.  Except  for  this  Agreement,  there  are no  material  contracts
outstanding  to which  Bond Fund is a party  other than  those  ordinary  in the
conduct of its business;

           E.  Bond  Fund is a series  of the  Trust  which  is a  Massachusetts
business trust duly organized,  validly  existing and in good standing under the
laws of the  Commonwealth  of  Massachusetts;  has all  necessary  and  material
Federal and state  authorizations  to own all its  properties  and assets and to
carry on its business as now being  conducted;  the shares of Bond Fund which it
issues  to  LifeSpan  Income  Fund  pursuant  to  the  Agreement  will  be  duly
authorized,  validly issued, fully-paid and non-assessable,  except as otherwise
set  forth  in Bond  Fund's  Registration  Statement;  and will  conform  to the
description  thereof contained in Bond Fund's  Registration  Statement,  will be
duly  registered  under the 1933 Act and in the  states  where  registration  is
required;  and Bond Fund is duly registered under the Act and such  registration
has not been revoked or rescinded and is in full force and effect;

           F. All  Federal  and  other  tax  returns  and  reports  of Bond Fund
required  by law to be filed have been  filed,  and all  Federal and other taxes
shown due on said  returns and reports  have been paid or  provision  shall have
been made for the payment  thereof and to the best of the knowledge of Bond Fund
no such return is currently under audit and no assessment has been asserted with
respect to such  returns and to the extent such tax returns  with respect to the
taxable  year of Bond Fund ended  December  31, 1997 have not been  filed,  such
returns  will be filed when  required and the amount of tax shown as due thereon
shall be paid when due;


                               A-11

<PAGE>



           G. Bond Fund has  elected  to be treated  as a  regulated  investment
company  and,  for each  fiscal  year of its  operations,  Bond Fund has met the
requirements  of Subchapter M of the Code for  qualification  and treatment as a
regulated  investment  company and Bond Fund  intends to meet such  requirements
with respect to its current taxable year;

           H. Bond Fund has no plan or  intention  (i) to  dispose of any of the
assets transferred by LifeSpan Income Fund, other than in the ordinary course of
business,  or (ii) to redeem or reacquire  any of the shares issued by it in the
reorganization other than pursuant to valid requests of shareholders; and

           I.    After    consummation    of    the    transactions
contemplated
by the Agreement, Bond Fund intends to operate its business in a
substantially unchanged manner.

     14. Each party hereby  represents to the other that no broker or finder has
been  employed  by  it  with  respect  to  the  Agreement  or  the  transactions
contemplated  hereby.  Each party also represents and warrants to the other that
the information  concerning it in the Proxy Statement and Prospectus will not as
of its date contain any untrue  statement of a material  fact or omit to state a
fact necessary to make the  statements  concerning it therein not misleading and
that the financial  statements  concerning it will present the information shown
fairly in accordance with generally accepted accounting  principles applied on a
basis  consistent  with the  preceding  year.  Each  party also  represents  and
warrants to the other that the Agreement is valid,  binding and  enforceable  in
accordance  with its terms and that the execution,  delivery and  performance of
the Agreement  will not result in any violation of, or be in conflict  with, any
provision of any charter,  by-laws,  contract,  agreement,  judgment,  decree or
order to which it is  subject  or to  which  it is a  party.  Bond  Fund  hereby
represents   to  and  covenants   with   LifeSpan   Income  Fund  that,  if  the
reorganization  becomes  effective,  Bond Fund will  treat each  shareholder  of
LifeSpan  Income Fund who received any of Bond Fund's  shares as a result of the
reorganization  as having  made the minimum  initial  purchase of shares of Bond
Fund  received  by  such  shareholder  for  the  purpose  of  making  additional
investments  in shares of Bond  Fund,  regardless  of the value of the shares of
Bond Fund received.

     15. Bond Fund agrees that it will prepare and file a Registration Statement
on Form N-14 under the 1933 Act which shall contain a preliminary  form of proxy
statement and prospectus  contemplated by Rule 145 under the 1933 Act. The final
form of such proxy  statement and  prospectus is referred to in the Agreement as
the "Proxy  Statement  and  Prospectus."  Each party agrees that it will use its
best  efforts to have such  Registration  Statement  declared  effective  and to
supply such information  concerning  itself for inclusion in the Proxy Statement
and Prospectus as may be

                               A-12

<PAGE>



necessary or desirable in this  connection.  LifeSpan  Income Fund covenants and
agrees,  as soon as practicable and, upon closing,  to cause the cancellation of
its outstanding shares.

     16. The obligations of the parties,  their respective trustees,  directors,
officers,  agents or others acting on their behalf under the Agreement  shall be
subject to  obtaining  an  exemptive  order  from the  Securities  and  Exchange
Commission  under  Section  17(a) of the Act and to the right of either party to
abandon  and  terminate  the  Agreement  for any  reason  and there  shall be no
liability for damages or other recourse  available to a party not so terminating
the Agreement, provided, however, that in the event that a party shall terminate
this Agreement without  reasonable  cause, the party so terminating  shall, upon
demand,  reimburse  the party not so  terminating  for all  expenses,  including
reasonable  out-of-pocket  expenses and fees  incurred in  connection  with this
Agreement.

     17. The  Agreement may be executed in several  counterparts,  each of which
shall be deemed  an  original,  but all  taken  together  shall  constitute  one
Agreement.  The rights and  obligations  of each party pursuant to the Agreement
shall not be assignable.

     18. All prior or contemporaneous  agreements and representations are merged
into the Agreement,  which  constitutes the entire contract  between the parties
hereto.  No  amendment or  modification  hereof shall be of any force and effect
unless in writing and signed by the parties and no party shall be deemed to have
waived  any  provision  herein  for its  benefit  unless it  executes  a written
acknowledgment of such waiver.

     19.  LifeSpan  Income Fund  understands  that the  obligations of Bond Fund
under the Agreement are not binding upon any Trustee or shareholder of Bond Fund
personally,  but bind only Bond Fund and Bond Fund's  property.  LifeSpan Income
Fund represents that it has notice of the provisions of the Declaration of Trust
of  the  Trust  disclaiming  shareholder  and  trustee  liability  for  acts  or
obligations of Bond Fund.

     IN WITNESS  WHEREOF,  each of the  parties has caused the  Agreement  to be
executed and  attested by its officers  thereunto  duly  authorized  on the date
first set forth above.

                     OPPENHEIMER INTEGRITY FUNDS
                     on behalf of
                     OPPENHEIMER BOND FUND


                      By:_________________________________
                        Andrew J. Donohue, Vice President


                               A-13

<PAGE>



                     OPPENHEIMER SERIES FUND, INC.
                     on behalf of
                     OPPENHEIMER LIFESPAN INCOME FUND




                      By:_________________________________
                          Andrew J. Donohue, Secretary










































                               A-14


                               B-14

<PAGE>



                             Exhibit B



                   Average Annual Total Returns
                  for the Periods Ended 12/31/97


                                     1-year  3-year 5-year  10-year


Bond Fund Class A Shares(1)          4.90%   8.75%  6.40%    -

LifeSpan Income Fund Class A Shares(15.36%     -       -     -

Bond Fund Class B Shares(2)          4.41%   8.87%    -      -

LifeSpan Income Fund Class B Shares(25.98%     -      -      -

Bond Fund Class C Shares(3)          8.39%     -      -      -

LifeSpan Income Fund Class C Shares(3)    10.  -      -      -



Total Returns  include change in share price and  reinvestment  of dividends and
capital gains distributions in a hypothetical  investment for the periods shown.
An  explanation  of the  different  performance  calculations  is in each Fund's
Prospectus.

(1) Class A returns  include the current  maximum  initial sales charge of 5.75%
for LifeSpan  Income Fund and the current  maximum initial sales charge of 4.75%
for Bond Fund.

(2) Class B returns include the applicable  contingent  deferred sales charge of
5%  (1-year)  and 3%  (3-year).  Class B shares are  subject to an annual  0.75%
asset-based sales charge.

(3) Class C returns  reflect the 1%  contingent  deferred  sales  charge for the
1-year result. Class C shares are subject to an annual
0.75% asset-based sales charge.


                                B-1

<PAGE>


                       OPPENHEIMER BOND FUND
         6803 South Tucson Way, Englewood, Colorado 80112
                          1-800-525-7048

                              PART B

                STATEMENT OF ADDITIONAL INFORMATION

                           April 6, 1998


     This Statement of Additional  Information of Oppenheimer Bond Fund consists
of this cover page and the following documents:

1.  Statement of Additional Information of Oppenheimer Bond Fund
dated April 30, 1997*

2.   Prospectus   of   Oppenheimer   LifeSpan   Income  Fund  dated
February
19, 1998*

3.  Statement of Additional Information of Oppenheimer LifeSpan
Income Fund dated February 19, 1998*

4.  Oppenheimer  Bond  Fund's  Annual  Report  as of  December  31,
1997*

5.   Oppenheimer   LifeSpan  Income  Fund's  Annual  Report  as  of
October
31, 1997*

6.   Pro   Forma   Financial   Statements,   including   Pro  Forma
Statement
of   Investments   of   Oppenheimer   LifeSpan   Income  Fund  into
Oppenheimer
Bond Fund*

     This Statement of Additional  Information (the  "Additional  Statement") is
not a Prospectus.  This Additional  Statement should be read in conjunction with
the Proxy Statement and Prospectus of Oppenheimer Bond Fund dated April 6, 1998,
which may be obtained by written request to OppenheimerFunds  Services, P.O. Box
5270,  Denver,  Colorado 80217, or by calling  OppenheimerFunds  Services at the
toll-free number shown above.


- ------------------
*  Filed with Registrant's Registration Statement on Form N-14
(Reg.  No.   333-47115)   2/27/98,   and  incorporated   herein  by
reference.


MERGE\305.#2

<PAGE>

LifeSpan Income Fund

Proxy for Special Shareholders Meeting To Be Held June 9, 1998

Your shareholder vote is important!

Your prompt response can save your Fund the expense of another mailing.

Please  mark your  proxy on the  reverse  side,  date and sign it, and return it
promptly in the accompanying envelope which requires no postage if mailed in the
United States.

           Please detach at perforation before mailing.
- ------------------------------------------------------------------------------
LifeSpan Income Fund

Proxy For Special Shareholders Meeting to be held June 9, 1998

The  undersigned  shareholder  of LifeSpan  Income Fund, a series of Oppenheimer
Series Fund, Inc. (the "Fund"),  does hereby appoint Robert J. Bishop, George C.
Bowen,   Andrew  J.  Donohue  and  Scott  T.  Farrar,   and  each  of  them,  as
attorneys-in-fact   and  proxies  of  the   undersigned,   with  full  power  of
substitution,  to attend the Special Meeting of the  Shareholders of the Fund to
be held on June 9, 1998, at 6803 South Tucson Way, Englewood,  Colorado 80112 at
10:00 A.M., Denver time, and at all adjournments thereof, and to vote the shares
held in the name of the  undersigned  on the record date for said meeting on the
Proposal  specified on the reverse side.  Said  attorneys-in-fact  shall vote in
accordance with their best judgment as to any other matter.

PROXY  SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS  WHO  RECOMMENDS A VOTE FOR
THE PROPOSAL ON THE REVERSE SIDE. THE SHARES REPRESENTED HEREBY WILL BE VOTED AS
INDICATED ON THE REVERSE SIDE OR FOR IF NO CHOICE IS INDICATED.

                                                                          (Over)
                                                                             305



<PAGE>


LifeSpan Income Fund

Proxy for Special Shareholders Meeting To Be Held June 9, 1998

Your shareholder vote is important!

Your prompt  response can save your Fund money.  Please vote, sign and mail your
proxy ballot (this card) in the enclosed  postage-paid envelope today, no matter
how many shares you own. A majority of the Fund's shares must be  represented in
person or by proxy. Please vote your proxy so your Fund can avoid the expense of
another mailing.

           Please detach at perforation before mailing.
- -----------------------------------------------------------------------------
1. The  Proposal:  To approve an Agreement  and Plan of  Reorganization  between
Oppenheimer  Series Fund, Inc. on behalf of the Fund and  Oppenheimer  Integrity
Funds on behalf of  Oppenheimer  Bond Fund ("Bond Fund"),  and the  transactions
contemplated thereby, including (a) the transfer of substantially all the assets
of the Fund in exchange for shares of Bond Fund,  (b) the  distribution  of such
shares to the shareholders of the Fund in complete  liquidation of the Fund, and
(c) the cancellation of the outstanding shares of the Fund.

      o    FOR       o    AGAINST         o    ABSTAIN

NOTE:  PLEASE SIGN  EXACTLY AS YOUR  NAME(S)  APPEAR ON THIS PROXY.
When
signing as custodian, attorney, executor,  administrator,  trustee, etc., please
give your full title as such.  All joint owners  should sign this proxy.  If the
account is registered in the name of a corporation, partnership or other entity,
a duly authorized individual must sign on its behalf and give his or her title.

                               Dated:    _________________________,
1998
                                          (Month)        (Day)


                               ----------------------------------------
                               Signature(s)


                               ----------------------------------------
                               Signature(s)

                               Please   read  both  sides  of  this
ballot

                                                                          (Over)
                                                                             305

merge\305.bal

<PAGE>


Bridget A. Macaskill

President and Chief Executive Officer




                                          April 8, 1998


Dear Oppenheimer LifeSpan Income Fund Shareholder,

      One of the things we pride ourselves on at  OppenheimerFunds,
Inc. is our commitment to
searching for new investment  opportunities  for our  shareholders.
I am writing to you today to let you
know about one of these opportunities - a positive change that has been proposed
for Oppenheimer LifeSpan Income Fund.

      After careful  consideration,  the Board of Directors agreed that it would
be in the best interest of shareholders  of Oppenheimer  LifeSpan Income Fund to
reorganize into another  Oppenheimer fund,  Oppenheimer Bond Fund. A shareholder
meeting has been  scheduled for June 9th, and all  Oppenheimer  LifeSpan  Income
Fund  shareholders  of record on March  17th are being  asked to vote  either in
person or by proxy.  You will find a notice of the  meeting,  a ballot  card,  a
proxy statement detailing the proposal,  an Oppenheimer Bond Fund prospectus and
a postage-paid return envelope enclosed for your use.

Why does the Board of Directors recommend this change?

      Oppenheimer LifeSpan Income Fund and Oppenheimer Bond Fund have compatible
objectives,  as  discussed  in the  enclosed  proxy  statement.  We believe that
Oppenheimer Bond Fund's flexible management approach allows that fund to respond
more  effectively  to changing  market and  economic  conditions,  and can offer
shareholders even better investment opportunities over the long term.

      Another benefit for shareholders is the greater economy of scale resulting
from  consolidation  into a much larger fund. By merging into  Oppenheimer  Bond
Fund  which  now has over  $190  million  in  assets -  former  shareholders  of
Oppenheimer LifeSpan Income Fund may benefit from a lower expense ratio as costs
are spread among a larger number of shares.

How do you vote?

      No matter how large or small your investment,  your vote is important,  so
please review the proxy  statement  carefully.  To cast your vote,  simply mark,
sign and date the  enclosed  proxy  ballot  and  return  it in the  postage-paid
envelope today.  Remember, it can be expensive for the Fund - and ultimately you
as a shareholder - to remail the ballots if not enough responses are received to
conduct the meeting.

                                                     (over, please)



<PAGE>



      If you have any questions about the proposal,  please feel free to contact
your financial advisor, or call us at 1-800-525-7048.

      As always,  we appreciate  your  confidence in  OppenheimerFunds  and look
forward to serving you for many years to come.

                                               Sincerely,



                                               /s/ Bridget A. Macaskill
                                               ------------------------
                                               Bridget A. Macaskill

Enclosures


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