PARNASSUS FUND
485APOS, 1998-01-21
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                                             1933 Act File No.: 2-93131
                                             1940 Act File No.: 811-4044

                       Securities and Exchange Commission
                              Washington, DC 20549


                                    Form N-1A

                  REGISTRATION UNDER THE SECURITIES ACT OF 1933


                         Post Effective Amendment No. 15

                                     and/or

                  REGISTRATION UNDER THE INVESTMENT ACT OF 1940

                                Amendment No. 17

                              _____________________

                               THE PARNASSUS FUND

               (Exact Name of Registrant as Specified in Charter)

                        One Market - Steuart Tower #1600
                             San Francisco, CA 94105

                     (Address of Principal Executive Office)

        Registrant's Telephone Number including Area Code: (415) 778-0200

                                Jerome L. Dodson
                        One Market - Steuart Tower #1600
                             San Francisco, CA 94105

                     (Name and Address of Agent for Service)
                             ----------------------

              It is proposed that this filing will become effective

      X On April 1, 1998 pursuant to paragraph (a) of Rule 485

- --------------------------------------------------------------------------------

Issuer has  registered an indefinite  number of securities  under the Securities
Act of 1933 pursuant to Section 270.24f-2 and the Rule 24f-2 notice for issuer's
fiscal year ending  December  31,  1997 will be filed on or about  February  27,
1998.






<PAGE>


<TABLE>
<CAPTION>

   
                               THE PARNASSUS FUND


                              Cross Reference Index
              ITEM                                            REFERENCE
              ----                                            ---------
  <S>         <C>                                             <C>
  Part A.     Information Required in a Prospectus
  Item 1.     Cover Page                                      Cover Page (p.1)
  Item 2.     Synopsis; Fee Information                       Fund Expenses (p.2)
  Item 3.     Financial Highlights                            Financial Highlights (p.3)
  Item 4.     General Description of Registrant               Investment Objective (p.4)
                                                              Principal Investment Restrictions (p.6); General
                                                              Information (p.13)
  Item 5.     Management of the Fund                          Management (p.6); The Adviser (p.8) General Information
                                                              (p.13)
  Item 6.     Capital Stock and other Securities              Distributions and Taxes (p.11);  How to Purchase Shares
                                                              (p.8) Management (p.6)
  Item 7.     Purchase of Securities Being                    How to Purchase Shares (p.8)
  Item 8.     Redemption or Repurchase                        How to Redeem Shares (p.10)
  Item 9.     Legal Proceedings                               None


Part B   Information Required in a Statement of Additional Information
  Item 10.   Cover Page                                       Cover Page (B-1)
  Item 11.   Table of Contents                                Table of Contents (B-1)
  Item 12.   General Information & History                    General (B-8)
  Item 13.   Investment Objective & Policies                  Investment Objectives & Policies (B-2)
  Item 14.   Management of the Registrant                     Management (B-4)
  Item 15.   Control Person & Principal Holders of            None
             Securities
  Item 16.   Investment Advisory & Other Services             The Adviser (B-5)
  Item 17.   Brokerage Allocation & Other Practices           The Adviser (B-5); Portfolio Transactions and
                                                              Brokerage (B-6)
  Item 18.   Capital Stock & Other Securities                 General (B-8)
  Item 19.   Purchase, Redemption & Pricing of Securities     Net Asset Value (B-7)
             Being Offered
  Item 20.   Tax Status                                       Prospectus (p.11)
  Item 21.   Underwriters                                     Portfolio Transactions and Brokerage (B-6)
  Item 22.   Calculation of Performance Data                  Performance Advertising and Calculation of Total
                                                              Return and Yield (B-7); Prospectus (p.12)
  Item 23.   Financial Statements                             Financial Statements (B-9)
</TABLE>
 
    




<PAGE>


THE PARNASSUS FUND

   
PROSPECTUS-APRIL 1, 1998

     The  Parnassus  Fund (the  "Fund")  is a  diversified  open-end  management
investment company, managed by Parnassus Investments (the "Adviser"). The Fund's
investment  objective  is to achieve  long-term  growth of capital.  The Adviser
chooses the Fund's  investments using social as well as financial  criteria.  In
general,  the Adviser  will  choose  investments  that it  believes  will have a
positive social impact.

     This  Prospectus  provides you with the basic  information  you should know
before  investing  in the  Fund.  You  should  read it and  keep  it for  future
reference.  A Statement of Additional  Information  ("SAI") dated April 1, 1998,
containing  additional  information  about  the  Fund has  been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus in its entirety. You may obtain a copy of the Statement of Additional
Information  without charge by calling or writing the Fund at the address listed
above.
    



                                TABLE OF CONTENTS

   
Fund Expenses                           2    How to Purchase Shares            8
Financial Highlights                    3    How to Redeem Shares             10
The Legend of Mt. Parnassus             3    Distributions and Taxes          11
Investment Objective and Policies       4    Performance Information          12
Principal Investment Restrictions       6    General Information              13
Management                              6
    

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



<PAGE>

FUND EXPENSES

     The following table illustrates all expenses and fees that a shareholder of
the Fund will incur.

SHAREHOLDER TRANSACTION EXPENSES
- --------------------------------
Maximum Sales Load Imposed on Purchases ..............................3.5%
Maximum Sales Load Imposed on Reinvested Dividends ...................None
Redemption Fees ......................................................None


   
     ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
     ----------------------------------------------------------------------
     Management Fees..................................................0.66%
     12b-1 Fees .......................................................None
     Other Operating Expenses ........................................0.45%
     Total Fund Operating Expenses ...................................1.11%

     The purpose of this table is to assist the  investor in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly. The following example illustrates the expenses that you would pay on
a $1000  investment  over various time periods  assuming (1) a 5% annual rate of
return and (2) redemption at the end of each time period.  As noted in the table
above, the Fund charges no redemption fees of any kind.

    ONE YEAR            THREE YEARS           FIVE YEARS         TEN YEARS
       $46                  $69                   $94              $165

     The expenses shown above are  cumulative--not  ones you pay every year. For
example, the $173 figure for ten years is not the annual expense figure, but the
total cumulative  expenses a shareholder would have paid for the entire ten-year
period. This example should not be considered a representation of past or future
expenses or  performance.  Actual  expenses  may be greater or lesser than those
shown.  For a  fuller  description  of  expenses,  see  pages  8  and 9 of  this
prospectus.
    

         From time to time, the Fund may direct  brokerage  commissions to firms
that may pay certain  expenses of the Fund subject to "best  execution." This is
done only when brokerage  costs are reasonable and the Fund  determines that the
reduction of expenses is in the best interest of the shareholders.  See page B-7
of the SAI for more information.  Since the Fund did not engage in such directed
brokerage in 1997 and if it does so in the future,  such  directed  brokerage is
expected to occur on an  irregular  basis,  so the effect on the expense  ratios
cannot be calculated with any degree of certainty.

   
(footnote deleted)
    




















                                        2



<PAGE>



   
FINANCIAL HIGHLIGHTS
- --------------------

     Selected data for each share of capital stock outstanding, total return and
ratios/supplemental  data for each of the ten years in the period ended December
31 are as follows:
<TABLE>
<CAPTION>
                              1997       1996       1995       1994      1993      1992      1991       1990      1989     1988
                            ----------------------------------------------------------------------------------------------------
<S>                           <C>        <C>        <C>        <C>       <C>       <C>       <C>        <C>       <C>      <C>  
Net asset value at            
beginning of period           34.39      31.77      32.82      31.81     29.94     23.53     16.09      20.62     20.46    16.16
                            ----------------------------------------------------------------------------------------------------
INCOME FROM INVESTMENT
OPERATIONS:
Net investment income(loss)   (0.14)     (0.06)      0.15       2.73      0.27      0.01      0.06       0.16      0.27    (0.05)
Net realized and
unrealized gain
(loss) on securities          10.04       3.77       0.07       1.00      4.84      8.60      8.29      (4.52)     0.30     6.90
                            ----------------------------------------------------------------------------------------------------
   Total from investment      
     operations               9.90        3.71       0.22       3.73      5.11      8.61      8.35      (4.36)     0.57     6.85
                            ----------------------------------------------------------------------------------------------------
DISTRIBUTIONS:
Dividends from net               -           -      (0.16)     (0.47)    (0.25)    (0.04)    (0.06)     (0.17)    (0.18)      -
investment income
Distributions from net
realized gain on securities  (8.55)      (1.09)     (1.11)     (2.25)    (2.99)    (2.16)    (0.85)         -     (0.23)   (2.55)
                            -----------------------------------------------------------------------------------------------------
    Total distributions      (8.55)      (1.09)     (1.27)     (2.72)    (3.24)    (2.20)    (0.91)     (0.17)    (0.41)   (2.55)
                            -----------------------------------------------------------------------------------------------------
Net asset value at end of    35.74       34.39      31.77      32.82     31.81     29.94     23.53      16.09     20.62    20.46
period
                            =====================================================================================================
TOTAL RETURN *               29.70%      11.68%      0.62%     11.98%    17.31%    36.80%    52.56%    (21.16%)    2.85%   42.44%
                                                                                      
RATIOS/SUPPLEMENTAL DATA:
Ratio of expenses to          
average net assets            1.11%       1.10%      1.02%      1.14%     1.26%     1.47%     1.51%      1.77%     1.65%    2.15%
Ratio of net investment 
income (loss) to average 
net assets                   (0.44%)     (0.17%)     0.54%      0.43%     0.13%     0.02%     0.26%      0.87%     1.21%   (0.49%)
Portfolio turnover rate      68.90%      59.60%     29.10%     28.10%    21.00%    32.80%    24.61%     38.25%    11.45%   32.34% 
Average  commission per     
share **                     $0.024      $0.033       .-         .-        .-        .-        .-         .-        .-       .-  
Net Assets, End of Period  $337,425    $268,235   $259,133   $160,994   $98,774   $56,237   $31,833    $20,738   $23,048  $10,863  
(000) 

<FN>
* Total  return  figures do not adjust for the sales  charge.  

**Average  commission rate is calculated for the periods beginning on or after January 1, 1996. 

Note: This information is taken from audited  financial  statements that were published in the Fund's annual reports and was audited
by Deloitte & Touche LLP.
</FN>
</TABLE>
    



THE LEGEND OF MT. PARNASSUS

     Parnassus  is a mountain in central  Greece whose twin peaks rise more than
8,000 feet above sea level.  A dense forest covers the slopes of Mt.  Parnassus,
but the summit is rocky and, most of the time,  covered with snow.  The mountain
plays a  prominent  role in  Greek  mythology  because  on its  southern  slope,
overlooking  the  Gulf of  Corinth,  lies  Delphi,  site of the  famous  oracle.
Originally,  the oracle belonged to Gaia, the earth goddess. Later, Mother Earth
was worshipped  under the name Delphyne and she controlled the oracle along with
her serpent-son,  Python, and her  priestess-daughters who controlled the rites.
Eventually,  the Greek god, Apollo,  took over the site, doing away with Python,
but keeping the priestesses.

     The  most  "Greek"  of  the  gods,  Apollo  represented  enlightenment  and
civilization and presided over the establishment of cities.  Identified with the
development  of Greek codes of law,  Apollo was also the god of light,  a master
musician  and skilled  archer.  Legend has it that Python,  an enormous  serpent
raised  in the  caves of Mt.  Parnassus,  controlled  the site of  Delphi.  When
Apollo,  representing  civilization,  challenged Python,  representing  anarchy,
there was a heroic struggle, but the god finally killed the dragon by shooting a
hundred arrows into its body.

     There  were many  oracles  in  ancient  Greece,  but only the one at Delphi
achieved  a record of  reliability.  Apollo's  temple at Delphi  soon  became an
enormous  storehouse of treasures that were gifts of those who had consulted the
oracle.

                                        3
<PAGE>

     The oracle communicated through the voice of a priestess who spoke while in
a trance.  The priests of Delphi,  who interpreted the sayings of the priestess,
obtained a great deal of knowledge  and  information  from talking to the people
who came from all over the Greek world to consult at the shrine of Apollo. Quite
often, the oracle went against the prevailing wisdom of the time and frequently,
the proud were humbled and the lowly were justified.



   
INVESTMENT OBJECTIVE AND POLICIES
- ---------------------------------

Objective

     The Fund's investment  objective is to achieve long-term growth of capital.
The Fund will  attempt to achieve  this  objective  by  investing  primarily  in
"equity  securities" based on the criteria described below.  "Equity securities"
consist of common  stocks or  securities  having the  characteristics  of common
stocks which include convertible  preferred stocks,  convertible debt securities
or warrants (up to 5% of total assets).  There can be no assurance that the Fund
will achieve its objective.

     The Fund's portfolio  emphasizes  equity  securities  issued by established
companies.  Established  companies  are defined as those that have at least $150
million in annual sales.


Selection Process

     In general,  the Fund's  Adviser uses three basic  criteria in  identifying
equity securities eligible for the Fund's portfolio:

    1) the stock is selling at a depressed  level  compared to its price history
       for the past five years (see I below);

    2) the issuer is  financially  sound with good prospects for the future (see
       II below); and

    3) the issuer has, in the Adviser's  judgement,  enlightened and progressive
       management (see III below).


     Generally, the Fund seeks to purchase equity securities that meet the above
criteria.  How the Adviser  determines  if a security  meets  these  criteria is
discussed below.

     I. THE CONTRARIAN PRINCIPLE. The first criterion listed above can be called
        "contrarian"  since it leads to the  purchase  of stocks that are out of
        favor with the investment community. The Adviser evaluates each security
        to determine whether it has:

        1) a market  price whose ratio to book value per share is lower than its
           historical average over the past five years;

        2) a  market  price  that  has  declined  to 70% or less of the  highest
           market price achieved during the past five years;

        3) a  market  price  whose  ratio  to  sales  per  share  is  below  its
           historical average over the past five years; and

        4) a market price that is at a 30% or greater  discount to its intrinsic
           value as calculated by the Adviser.

     The ratios given above are not absolute  limits,  but represent  guidelines
generally  followed by the  Adviser.  A security  may be selected for the Fund's
portfolio  even if it does not meet all of the above tests,  but generally  will
not be selected if it does not meet any of such tests.

    II. FINANCIAL  CONSIDERATIONS.  The Adviser  applies  financial  criteria to
        each  stock  that  meets  its  "contrarian"  standards  in an  effort to
        determine whether the issuer is financially sound and has good prospects
        for the future. The Adviser generally considers the following factors in
        determining whether or not a company is financially sound:

        1) financial  strength,  in the form of net assets,  as determined by an
           analysis of the company's balance sheet;

        2) total  annual  sales of the company  compared to its sales five years
           ago;

        3) earnings history and the outlook for future earnings; and

        4) the company's net cash flow.

                                        4
<PAGE>

  III.  QUALITATIVE FACTORS.  There are also five  qualitative  factors that, in
        the  Adviser's   opinion,   constitute   "enlightened   and  progressive
        management" of issuers:

        1) the quality of the company's products and services;

        2) the  degree  to which the  company  is  marketing-oriented  and stays
           close to the customer;

        3) the sensitivity of the company to the communities where it operates;

        4) the company's treatment of its employees; and

        5) the company's ability to innovate and respond well to change.

     Although the Fund emphasizes  positive  reasons for investing in a company,
our operating policies call for excluding  companies that manufacture alcohol or
tobacco  products  or are  involved  with  gambling.  The Fund also  screens out
weapons contractors and those that generate electricity from nuclear power.

     On the positive side,  the Fund looks for a number of important  attributes
to  determine  if a  firm  is a  socially  responsible  company.  These  include
equitable  treatment of employees,  a good  environmental  protection policy, an
effective equal employment opportunity program, a record of civic commitment and
a history of ethical business dealings.
    


Other Policies

   
     The  Parnassus  Fund  may  invest  up to  5% of  its  assets  in  community
development  loan funds such as those that provide  financing for small business
and for low and  moderate  income  housing.  The Fund  will not make  loans to a
project itself,  but rather will invest money in an intermediary  community loan
fund. With projects having a strong, positive social impact, the Fund may invest
in obligations  issued by community loan funds at  below-market  interest rates.
Generally,  there is no  secondary  market,  and thus no  liquidity,  for  these
investments.  In general,  the Fund seeks to invest in  community  organizations
that have had a  successful  record in making  these kinds of loans and that are
deemed creditworthy by the Adviser.

     The Fund may  purchase  foreign  securities  up to a maximum  of 15% of the
value  of  its  total  net  assets.  Such  investments  increase  a  portfolio's
diversification and may enhance return, but they also involve some special risks
such  as:   exposure  to  potentially   adverse  local  political  and  economic
developments; nationalization and exchange controls; potentially lower liquidity
and higher  volatility;  possible problems arising from accounting,  disclosure,
settlement and regulatory  practices  that differ from U.S.  standards;  and the
chance  that   fluctuations   in  foreign   exchange  rates  will  decrease  the
investment's  value (favorable change can increase its value). The Fund may also
invest up to 5% of its total net assets in venture capital limited partnerships.
These  investments will not be liquid and will likely involve a higher degree of
risk than most portfolio securities.

     Under normal circumstances,  the Fund will have virtually all of its assets
invested in equity  securities.  However,  for temporary  defensive  purposes or
pending the investment of the proceeds from sales of shares of the Fund or sales
of portfolio securities,  or for other reasons at the discretion of the Adviser,
all or part of the assets may be  invested  in money  market  instruments  or in
investment  grade,  long-term  debt  securities.  The Fund may also  enter  into
repurchase agreements,  which basically involve the purchase by the Fund of debt
securities and their resale at an agreed-upon  price.  While the Fund intends to
be fully  "collateralized"  as to such  agreements,  and the collateral  will be
marked to market  daily,  if the entity  obligated to  repurchase  from the Fund
defaults or enters  bankruptcy,  there may be delays and expenses in liquidating
the  securities,  a  possible  decline  in their  value  and  potential  loss of
interest.

     The Fund may also lend its portfolio securities to broker-dealers and other
institutional  borrowers to generate income. The Fund will receive collateral to
secure the  borrower's  obligation;  however,  if the  borrower  defaults on its
obligation,  the Fund bears the risk of delay in the  recovery of its  portfolio
securities and the risk of loss in rights in the  collateral.  See the Statement
of  Additional  Information  for further  details on repurchase  agreements  and
securities lending.
    

                                        5
<PAGE>
PRINCIPAL INVESTMENT RESTRICTIONS

   
     The  Fund  is  subject  to  certain   investment   restrictions  which  are
fundamental policies and, as such, cannot be changed without the approval of the
holders of a majority of the Fund's outstanding  voting  securities.  The Fund's
investment objective is such a policy, as are restrictions that provide that the
Fund may not: (i) with respect to 75% of its net assets,  invest more than 5% of
the  value  of its net  assets  in  securities  of any one  issuer  (other  than
obligations issued or guaranteed by the United States  Government,  its agencies
or its  instrumentalities)  or purchase more than 10% of the outstanding  voting
securities  of any one  issuer;  (ii)  invest  more than 25% of the value of its
total assets in securities of issuers in any one industry; or (iii) borrow money
except from banks for  temporary or emergency  purposes in amounts not exceeding
10% of the Fund's total assets.  (Generally,  the Fund will not make  additional
investments  while such borrowings are outstanding.) It is possible for the Fund
to make limited  investments  in the securities of other  investment  companies.
Additional information about the Fund's investment  restrictions is contained in
the Statement of Additional Information.

     It is the position of the Securities and Exchange  Commission  ("SEC") (and
an operating  although not a  fundamental  policy of the Fund) that the Fund may
not make certain  illiquid  investments if thereafter more than 15% of the value
of its net assets would be so invested.  Investments  included in this 15% limit
are: (i) those which are restricted, i.e., those which cannot freely be sold for
legal reasons;  (ii) fixed time deposits subject to withdrawal  penalties (other
than overnight deposits);  (iii) repurchase agreements having a maturity of more
than seven  days;  and (iv)  investments  for which  market  quotations  are not
readily available. However, the 15% limit does not include obligations which are
payable at  principal  amount  plus  accrued  interest  within  seven days after
purchase or commercial paper issued under section 4 (2) of the Securities Act of
1933, as amended ("1933 Act"), or securities eligible for resale under Rule 144A
of the 1933 Act that have been  determined  to be liquid  pursuant to procedures
adopted by the Board of Trustees.

     Unless  otherwise  stated,  the Fund's  investment  policies are  operating
policies,  i.e.,  non-fundamental,  and may be changed by the Board of  Trustees
without shareholder approval.
    


MANAGEMENT

     The Fund's  Board of  Trustees  decides  on  matters of general  policy and
supervises the activities of the Fund's Adviser. The Fund's officers conduct and
supervise the daily  business  operations of the Fund. The Trustees and officers
are listed below,  together with their principal occupations during at least the
past five years.

   
     Jerome  L.  Dodson*,  54,  President  and  Trustee,  is also  President  of
Parnassus  Investments.  From 1975 to 1982,  Mr.  Dodson served as President and
Chief  Executive  Officer of  Continental  Savings and Loan  Association  in San
Francisco.  From 1982 to 1984, he was President of Working Assets Money Fund and
he  also  served  as a  Trustee  from  1988 to  1991.  He is a  graduate  of the
University of California at Berkeley and of Harvard University's Graduate School
of Business  Administration  where he concentrated in finance. Mr. Dodson is the
Fund's  portfolio  manager.  He is also  President  and Trustee of the Parnassus
Income  Trust.  He has served as a Trustee of The  Parnassus  Income Trust since
1992.

     David  L.  Gibson,  58,  Trustee,   is  an  attorney  in  private  practice
specializing in taxation and personal financial planning.  From 1973 to 1984, he
was with the Crown  Zellerbach  Corporation  where he served as tax counsel and,
later, as Director of Public Affairs.  Mr. Gibson is active in civic affairs and
his special interests include senior citizens and environmental  protection.  He
holds a bachelor's degree in business  administration from Virginia  Polytechnic
Institute,  an MBA from Golden Gate  University,  a JD from  Washington  and Lee
University and an LLM from William and Mary. Mr. Gibson is also a Trustee of The
Parnassus Income Trust.

     Gail L.  Horvath,  48,  Trustee,  is co-owner  and  director of new product
development  at  Just  Desserts,  a  San  Francisco-based  bakery  and  cafe.  A
co-founder of Just Desserts,  her experience  includes market research,  product
planning and product  development.  For four years,  she served as a director of
Continental Savings of America. She is a graduate of Ohio State University.  Ms.
Horvath is also a Trustee of The Parnassus Income Trust.
    

                                        6
<PAGE>
   
     Herbert  A.   Houston,   54,  is  the  Chief   Executive   Officer  of  the
Haight-Ashbury Free Clinics, Inc. Previously,  he worked as Development Director
for the National Association for Sickle Cell Disease,  Vice President of the Bay
Area Black United Fund and as an executive for the Combined Federal Campaign and
the United Way of the Bay Area. He is a graduate of California  State University
at  Hayward  and  holds a  Master's  degree in  Public  Administration  & Health
Services  from the  University  of Southern  California.  Mr.  Houston is also a
Trustee of The Parnassus Income Trust since 1992.

     Cecilia C.M. Lee, 54, is President of Ultra Media,  a Silicon  Valley-based
electronics  firm.  She  is  active  in  community  affairs  with  the  Stanford
Children's Hospital and the Cupertino Children's Choir. Ms. Lee is a Director of
the Tech Museum of Innovation and the Asian-American  Manufacturers Association.
She is  also on the  Advancement  Board  of the  West  Valley-Mission  Community
College.  She  received a  bachelor's  degree  from the  National  Music and Art
Institute of Taiwan. Ms. Lee is also a Trustee of The Parnassus Income Trust.

     Leo T.  McCarthy,  67, is  President  of the Daniel  Group,  a  partnership
involved in foreign trade. His current  directorships include Linear Technology,
Open Data Systems and the U.S. National Gambling Impact Study Commission. He has
also served as a Regent of the University of  California.  From 1969 to 1982, he
served as a member of the California State Assembly,  six years as Speaker. From
1983 to 1995, he served as Lieutenant  Governor of the State of California where
his major  responsibility  was economic  development.  He holds a B.S.  from the
University  of San  Francisco  and a J.D.  from San  Francisco Law School and is
licensed to practice law in  California.  Mr.  McCarthy is also a Trustee of The
Parnassus Income Trust.

     Donald E. O'Connor,  61, is a retired  executive who spent 28 years as Vice
President of Operations for the Investment Company Institute,  (the "ICI" is the
trade  association  of the mutual fund  industry.)  During that period,  he also
spent 10 years as Chief Operating  Officer of the ICI Mutual Insurance  Company.
Prior to joining the ICI, he spent six years with the SEC,  including four years
as Branch Chief of Market Surveillance.  He currently serves as a Trustee of the
Advisors  Series  Trust,  another  mutual  fund.  He is a graduate of The George
Washington  University and holds a Masters in Business  Administration  from the
same institution. Mr. O'Connor is also a Trustee of The Parnassus Income Trust.

     Howard  M.  Shapiro,  66,  is  a  consultant  to  non-profit  organizations
specializing   in  marketing,   fund-raising   and   organizational   structure.
Previously,  he  worked  for 28  years  in  marketing,  advertising  and  public
relations.  He is Chairman of the Board of the Portland Housing Authority and is
Vice  Chairman of the Board of the Albina  Community  Bank in Portland.  He also
serves on the Board of Oregon's State Accident  Insurance Fund and the Multnomah
County  Investment  Council.  Mr.  Shapiro is a graduate  of the  University  of
Washington.  He is  also a  Trustee  of The  Parnassus  Income  Trust.  He is no
relation to Joan Shapiro.

     Joan  Shapiro,  55,  is a  consultant  in  development  banking,  community
reinvestment,  ethical investing,  and corporate social  responsibility.  For 20
years  she  worked  with the South  Shore  Bank of  Chicago,  most  recently  as
Executive Vice  President.  She is a former  President of the Social  Investment
Forum, the national trade association of the social investment industry.  Active
in  Chicago's  civic  and  cultural  life for 25  years,  she is a  Governor  of
International House of the University of Chicago and a member of the President's
Council of Cornell Women. She is a graduate of Cornell  University.  Ms. Shapiro
is also a Trustee of The Parnassus  Income  Trust.  She is no relation to Howard
Shapiro.

     Howard Fong, 52, Vice  President and  Treasurer,  is also Vice President of
Parnassus  Investments.  Mr.  Fong  began  his  career as an  examiner  with the
California  Department  of  Savings  and Loan.  In 1979,  he joined  Continental
Savings where he worked until 1988,  most recently as Senior Vice  President and
Chief  Financial  Officer.  He  joined  The  Parnassus  Fund in 1988.  Mr.  Fong
graduated  from  San  Francisco  State  University  with a  degree  in  business
administration.

     Richard  D.  Silberman,  60,  Secretary,  is an  attorney  specializing  in
business  law.  He has been  general  counsel  to The  Parnassus  Fund since its
inception.  He holds a  bachelor's  degree in business  administration  from the
University  of  Wisconsin,  a  Bachelor  of Law,  also  from the  University  of
Wisconsin and a Master of Law from Stanford  University.  He is a member of both
the Wisconsin and California Bars.
    

*Denotes "interested" trustee as defined in the Investment Company Act of 1940.


                                        7
<PAGE>
The Adviser

   
     Parnassus Investments (the "Adviser"),  One Market-Steuart Tower #1600, San
Francisco,  California 94105, acts as investment adviser to the Fund, subject to
the  control  of the  Fund's  Board of  Trustees,  and as such,  supervises  and
arranges the purchase and sale of securities  held in the portfolio of the Fund.
The Adviser has had 13 years of experience managing the Fund.

     For its services,  the Fund,  under an Investment  Advisory  Agreement (the
"Agreement") between the Fund and the Adviser,  pays the Adviser a fee, computed
and payable at the end of each month, at the following annual percentages of the
Fund's average daily net assets: 1.00% of the first $10 million in assets; 0.75%
of the amount above $10 million in assets up to $30 million; 0.70% of the amount
above $30 million up to $100 million;  0.65% of the amount above $100 million up
to $200 million;  and 0.60% of the amount above $200 million. For 1997, the Fund
paid the Adviser 0.66% of its average daily net assets.

     In addition to the fee payable to the Adviser,  the Fund is responsible for
its  operating  expenses,  including:  (i)  interest and taxes;  (ii)  brokerage
commissions;  (iii) insurance  premiums;  (iv)  compensation and expenses of its
Trustees  other  than those  affiliated  with the  Adviser;  (v) legal and audit
expenses;  (vi) fees and expenses of the Fund's  custodian,  transfer  agent and
accounting  services  agent;  (vii)  expenses  incident  to the  issuance of its
shares,  including  issuance on the payment of, or reinvestment  of,  dividends;
(viii) fees and expenses  incident to the  registration  under  Federal or state
securities laws of the Fund or its shares; (ix) expenses of preparing,  printing
and mailing  reports and notices and proxy material to shareholders of the Fund;
(x)  all  other   expenses   incidental  to  holding   meetings  of  the  Fund's
shareholders;  (xi) dues or  assessments of or  contributions  to the Investment
Company  Institute and the Social  Investment  Forum;  (xii) such  non-recurring
expenses as may arise,  including  litigation  affecting  the Fund and the legal
obligations  which the Fund may have to indemnify its officers and Trustees with
respect thereto. In allocating brokerage  transactions,  the investment advisory
agreement  states that the Adviser may, subject to its obligation to obtain best
execution,  consider research provided by brokerage firms or whether those firms
sold  shares  of the  Fund.  See  page B-7 of the SAI for  more  information  on
brokerage and portfolio transactions.
    


HOW TO PURCHASE SHARES
- ----------------------

     Because the sales  charge on its shares is lower than that  charged by many
other  investment  companies which impose a sales charge,  The Parnassus Fund is
what is commonly called a "low load" fund.

     Shares of the Fund may be  purchased  by  sending a check  directly  to the
Adviser,  which is also the Fund's principal  underwriter  ("Distributor")  (see
"Direct   Purchase  of  Shares"   below),   or  by  ordering  shares  through  a
broker-dealer  which is a member  of the  National  Associations  of  Securities
Dealers,  Inc.  and has  signed  a sales  agreement  with the  Distributor  (see
"Purchases through a Broker-Dealer"  below). The purchase price per share is the
offering  price,  which  is the  net  asset  value  per  share  as of  the  next
calculation  after  the  order is  placed,  plus a sales  charge  calculated  as
follows:

<TABLE>
<CAPTION>

- -------------------------------------------------------------------------------------------------------------------
     SALES CHARGE AS A PERCENTAGE OF
- -------------------------------------------------------------------------------------------------------------------
                                                                                                    DEALER DISCOUNT
                                                           OFFERING          NET ASSET              AS A PERCENTAGE
     AMOUNT OF TRANSACTION AT OFFERING PRICE                 PRICE             VALUE                 OFFERING PRICE
- -------------------------------------------------------------------------------------------------------------------
     <S>                                                    <C>               <C>                   <C>   
     Less than $15,000                                       3.5%              3.63                       3.5%
     $15,000 but less than $25,000                           3.0               3.09                       3.0%
     $25,000 but less than $50,000                           2.5               2.56                       2.5%
     $50,000 but less than $100,000                          2.0               2.04                       2.0%
     $100,000 but less than $250,000                         1.5               1.52                       1.5%
     $250,000 but less than $500,000                         1.0               1.01                       1.0%
     $500,000 but less than $1,000,000                       0.5               0.50                       0.5%
     $1,000,000 or more                                                    No Sales Charge

</TABLE>

                                                           8
<PAGE>

     Investors in the following  categories  may combine their  purchases into a
single transaction to qualify for a reduced sales charge: 1) an individual,  his
or her spouse and their children purchasing for his, her or their own account(s)
and 2) a trustee or other  fiduciary  purchasing  for a single  trust  estate or
single fiduciary account.

     Certain  categories  of people may  invest in The  Parnassus  Fund  without
paying a sales charge. These categories include Trustees, officers and employees
of The  Parnassus  Fund  and  the  Fund's  investment  adviser,  representatives
registered with the National Association of Securities Dealers,  Inc., custodial
accounts  qualifying  under  Section  403(b) or Section  401(k) of the  Internal
Revenue Code, pension,  profit-sharing or other employee benefit plans qualified
under  Section 401 of the Internal  Revenue Code and  discretionary  accounts of
bank trust  departments  or  registered  investment  advisers.  Investors may be
charged a transaction  or other fee in connection  with purchases or redemptions
of Fund shares at net asset value (i.e., without a sales charge) on their behalf
by an investment adviser, a brokerage firm or other financial institution.


Statement of Intention (Letter of Intent)

     A single  investor may also obtain the reduced sales charges shown above by
completing  a Statement  of  Intention.  By  expressing  in writing an intent to
invest $15,000 or more within a  thirteen-month  period,  a single  investor may
obtain the reduced  sales  charges  shown above.  You can obtain a form for this
purpose  by  writing  or  calling  the Fund or you can write  your own letter of
intent.

     While a shareholder is not obligated to fulfill a letter of intent,  if the
goal is not met,  the  purchaser is required to pay the  difference  between the
sales charge actually paid and the one that would otherwise have been due had no
Statement of Intention been signed.


Rights of Accumulation

     A single investor may also obtain a cumulative  quantity discount (known as
a right of  accumulation) by adding his or her current purchase to the net asset
value (at the close of business on the  previous  day) of all shares  previously
purchased and still owned in the Fund. The applicable sales charge is then based
on this total.  A  shareholder  may also add the total of any  investment in The
Parnassus  Income Trust to The Parnassus  Fund total for purposes of calculating
the sales charge. To benefit from any right of accumulation (ROA), a shareholder
must identify any ROA links to other accounts and communicate these links to the
Fund's shareholder service staff.


Other Information

     The Fund also offers additional services to investors,  including plans for
the systematic investment and withdrawal of money, as well as IRA and SEP plans.
Information about these plans is available from the Distributor.

     The minimum initial  investment in the Fund is $2,000 except for retirement
plans, accounts opened pursuant to a Uniform Transfers to Minors Act (UTMA) or a
Uniform Gifts to Minors Act (UGMA),  and PAIP accounts which have a $500 minimum
initial  investment.  The minimum additional  investment is $50. The Distributor
reserves the right to reject any order.


Direct Purchase of Shares

     An investor should complete and mail an application  form and send it along
with a check payable to The Parnassus Fund. It should be sent to the Fund at the
following address:

                               The Parnassus Fund
                         One Market-Steuart Tower #1600
                         San Francisco, California 94105

   
     An initial  investment  must be at least $2,000  except for PAIP  accounts,
UGMA accounts and certain  employee  benefit  plans or tax qualified  retirement
plans (e.g. IRA(S),  SEP(S)) which have a $500 minimum.  Subsequent  investments
for all accounts must be at least $50. With subsequent investments, shareholders
should write the name and number of the account on the check. Checks do not need
to be certified,  but are accepted  subject to  collection  and must be drawn in
United States dollars on United States banks.  The investment  will be processed
at the public offering price  calculated on the same business day it is received
if it  arrives  before  1:00 p.m.  San  Francisco  time;  otherwise,  it will be
processed the next business day.
    

                                        9
<PAGE>

Purchases Via Parnassus Automatic Investment Plan (PAIP)

     After making an initial  investment to open an account,  a Fund shareholder
may  purchase  additional  shares  ($50  minimum)  via the  Parnassus  Automatic
Investment  Plan  (PAIP).  On a monthly  or  quarterly  basis,  your  money will
automatically  be transferred from your bank account to your Fund account on the
day of your choice (3rd or 18th day of the month).  You can elect this option by
filling out the PAIP section on the new account form.  For further  information,
call the Fund and ask for the free  brochure  called  "Automatic  Investing  and
Dollar-Cost Averaging".


Purchases Through A Broker-Dealer

   
     Broker-dealers  may  place  orders  on behalf of  clients  by  calling  the
Distributor. If a client places an order with a broker-dealer prior to 1:00 p.m.
San  Francisco  time on any  business  day  (see  below)  and the  broker-dealer
forwards the order to the  Distributor  prior to 1:00 p.m. San Francisco time on
that day, the order will be processed at the  offering  price  calculated  as of
1:00 p.m. that same day. Otherwise,  the order will be processed at the offering
price next calculated,  typically as of the close of the New York Stock Exchange
("NYSE") the next business day. The  broker-dealer  is  responsible  for placing
purchase orders promptly with the Distributor and for forwarding  payment within
three business days.
    


Net Asset Value

   
     The Fund's net asset  value per share is  ordinarily  determined  as of the
close of trading on the NYSE,  usually 4:00 p.m.  Eastern time, on each day that
the NYSE is open for trading ("business day") and on any other day that there is
a sufficient degree of trading in investments held by the Fund to affect the net
asset value,  except that the net asset value may not be  determined  on any day
that there are no  transactions  in shares of the Fund.  The net asset value per
share is the value of the Fund's assets,  less its  liabilities,  divided by the
number of shares of the Fund  outstanding.  In general,  the value of the Fund's
portfolio securities is the market value of such securities. However, securities
and other  assets for which  market  quotations  are not readily  available  are
valued at their fair value as  determined  in good  faith by the  Adviser  under
procedures  established by and under the general  supervision and responsibility
of the Fund's Board of Trustees. See the Statement of Additional Information for
details.
    


Telephone Transfers

     Shareholders  who  elect  to use  telephone  transfer  privileges  must  so
indicate on the account  application  form.  The  telephone  transfer  privilege
allows a  shareholder  to effect  exchanges  from the Fund  into an  identically
registered  account in another one of the Parnassus  Funds (e.g.,  The Parnassus
Income  Trust).  Neither the Fund nor Parnassus  Investments  will be liable for
following  instructions  communicated  by  telephone  reasonably  believed to be
genuine;   a  loss  to  the  shareholder  may  result  due  to  an  unauthorized
transaction.   The  Fund  and  Parnassus   Investments  will  employ  reasonable
procedures to confirm that  instructions  communicated by telephone are genuine.
Procedures  may include one or more of the  following:  recording  all telephone
calls requesting telephone exchanges, verifying authorization and requiring some
form of personal  identification prior to acting upon instructions and sending a
statement  each  time a  telephone  exchange  is made.  The  Fund and  Parnassus
Investments  may be liable  for any  losses due to  unauthorized  or  fraudulent
instructions  only if such  reasonable  procedures are not followed.  Of course,
shareholders are not obligated in any way to authorize  telephone  transfers and
may choose to make all exchanges in writing.  The telephone  exchange  privilege
may be modified or  discontinued  by the Fund at any time upon 60 days'  written
notice to shareholders.


HOW TO REDEEM SHARES
- --------------------

     You may sell or redeem your Fund shares by offering  them for  "repurchase"
or "redemption" directly to the Fund or through your dealer. If you offer shares
through  your dealer  before the close of the New York Stock  Exchange  and your
dealer  transmits your offer to the Distributor  before 1:00 p.m. (San Francisco
time) that day, you will  receive  that day's price.  Your dealer may charge for
this service,  but you can avoid this charge by selling your shares  directly to
the Fund as described below.

   
     To sell your shares  directly to the Fund (that is, to redeem your shares),
you must send your written  instructions to the Fund at One Market-Steuart Tower
#1600,  San  Francisco,  California  94105.  You may also send  your  redemption
instructions  by FAX to (415)  778-0228 if the  redemption is less than $25,000.
Your  shares  will be  redeemed  at the net asset  value next  determined  after
receipt  by the Fund of your  written  instructions  in proper  form.  Give your
account number and indicate the number of shares you wish
    

                                       10
<PAGE>

   
to redeem.  All owners of the account  must sign unless the account  application
states that only one  signature is necessary  for  redemptions.  All  redemption
checks must be sent to the  address-of-record on the account. The Fund must have
a  change-of-address   on  file  for  30  days  before  we  send  redemption  or
distribution  checks to the new  address.  Otherwise,  we  require  a  signature
guarantee  or the  check  must be sent to the old  address.  If you wish to have
redemption  proceeds sent by wire transfer or by overnight mail, there will be a
charge of $10 per transaction.  The Fund usually requires  additional  documents
when shares are registered in the name of a  corporation,  agent or fiduciary or
if you are a surviving  joint owner.  In the case of a  corporation,  we usually
require a corporate resolution signed by the secretary.  In the case of an agent
or  fiduciary,  we usually  require an  authorizing  document.  In the case of a
surviving  joint  owner,  we  usually  require a copy of the death  certificate.
Contact  the Fund by phone at (800)  999-3505  if you have any  questions  about
requirements for redeeming your shares.
    

     If the Fund has received  payment for the shares you wish to redeem and you
have provided the  instructions  and any other documents needed in correct form,
the  Fund  will  promptly  send you a check  for the  proceeds  from  the  sale.
Ordinarily, the Fund must send you a check within seven days unless the New York
Stock Exchange is closed for other than weekends or holidays.  However,  payment
may be delayed for any shares  purchased by check for a reasonable  time (not to
exceed 15 days from the date of such  purchase)  necessary to determine that the
purchase check will be honored.  Rules of the Securities and Exchange Commission
also authorize delayed  redemptions  during periods when trading on the Exchange
is restricted or during an emergency  which makes it impractical for the Fund to
dispose of its securities or to determine  fairly the value of its net assets or
during any other period  authorized  by the  Commission  for the  protection  of
investors.

   
     REINVESTMENT  PRIVILEGE.  If you redeem some or all of your shares and then
change your mind,  you may reinvest  them without  sales charge at the net asset
value if you do so within 60 days.  This privilege may be exercised only once by
a shareholder with respect to this Fund.  However, a shareholder has not used up
this one-time  privilege if the sole purpose of a prior redemption was to invest
the proceeds at net asset value in an Individual  Retirement  Account or SEP. If
the  shareholder  has  realized a gain on the  redemption,  the  transaction  is
taxable and reinvestment will not alter any capital gains tax payable.  If there
has been a loss on the redemption, some or all of the loss may not be allowed as
a tax deduction  depending on the amount  reinvested.  If a shareholder  redeems
shares from the Fund and invests the proceeds in shares of The Parnassus  Income
Trust,  the  shareholder  may reinvest the proceeds of the  redemption  of those
shares back into the Fund at any time without a sales  charge.  The Fund resumes
the right to modify or eliminate this exchange privilege in the future.

     REDEMPTION  OF SMALL  ACCOUNTS.  The  Trustees  may, in order to reduce the
expenses of the Fund,  redeem all of the shares of any shareholder whose account
is worth  less  than  $500 as a result  of a  redemption.  The  Fund  will  give
shareholders  whose shares are being  redeemed 60 days' prior written  notice in
which to purchase sufficient shares to avoid such redemption.
    


DISTRIBUTIONS AND TAXES
- -----------------------

   
     By paying out  substantially  all its net  investment  income  (among other
things),  the  Fund  has  qualified  as a  regulated  investment  company  under
Subchapter  M of the  Internal  Revenue  Code.  The Fund  intends to continue to
qualify  and,  if so,  it will not pay  federal  income  tax on  either  its net
investment income or on its net capital gains. Instead, each shareholder will be
responsible for his or her own taxes.  All dividends from net investment  income
together with distributions of short-term capital gains  (collectively,  "income
dividends"), will be taxable as ordinary income to shareholders even though paid
in additional shares.  Tax-exempt shareholders,  of course, will not be required
to pay  taxes  on any  amount  paid  to  them.  This  includes  IRAs  and  other
tax-deferred retirement accounts.

     Any net long-term capital gains ("capital gain distributions")  distributed
to shareholders are taxable as such to shareholders. Tax-exempt shareholders, of
course,  will not be  required to pay taxes on any  amounts  paid to them.  As a
result of tax law changes enacted in 1997,  there are different  maximum federal
income tax rates  applicable  to your  capital gain  distributions  if you are a
noncorporate  taxpayer  depending on the Fund's holding period and your marginal
rate of federal income tax -- generally,  28% for gains recognized on securities
held for more than one year but not more than 18 months  and 20% (10% if you are
in the 15% marginal tax bracket) for gains  recognized  on  securities  held for
more than 18 months.

     Income  dividends and capital gain  distributions  will  ordinarily be paid
once a year, and they are taxable in the year received.  For the  convenience of
investors,  all payments  are made in shares of the Fund,  and there is no sales
charge for this  reinvestment.  Shareholders  who  prefer to receive  payment of
income  dividends  and/or capital gain  distributions  in cash should notify the
Fund at least five days prior to the payment date. Annually, you will receive on
Form 1099 the dollar amount and tax status of all distributions you received.
    

                                       11
<PAGE>

   
     The Fund may be required to impose backup withholding at a rate of 31% from
any  income  dividends  and  capital  gain  distributions  and upon  payment  of
redemption   proceeds.   Shareholders  can  eliminate  any  backup   withholding
requirements by furnishing  certification of taxpayer identification numbers and
reporting dividends.

     To the extent that income  dividends are derived from qualifying  dividends
paid  by  domestic  corporations  whose  shares  are  owned  by the  Fund,  such
dividends, in the hands of the Fund's corporate  shareholders,  will be eligible
for the 70% dividends received deduction.

     The dividend and capital gain  distribution  is usually made in December of
each year. If an investor purchases shares just before the distribution date, he
or she will be taxed on the distribution even though it's a return of capital.
    


PERFORMANCE INFORMATION
- -----------------------

   
     From  time to time,  the Fund may  advertise  its  total  return  for prior
periods.  Any such  advertisement  would include at least  average  annual total
return  quotations  for one, five and ten year periods.  The total return of the
Fund for a particular  period represents the increase (or decrease) in the value
of a hypothetical  investment in the Fund,  from the beginning to the end of the
period.  Total  return is  calculated  by  subtracting  the value of the initial
investment  from the ending value and showing the  difference as a percentage of
the initial  investment;  the calculation assumes the initial investment is made
at the maximum public  offering price (maximum sales charge) and that all income
dividends or capital  gains  distributions  during the period are  reinvested in
Fund shares at net asset value.  No  adjustments  are made to reflect any income
taxes payable by shareholders on dividends and  distributions  paid by the Fund.
Average  annual  total  return  quotations  for periods of two or more years are
computed by finding the average annual compounded rate of return over the period
that would equate the initial amount  invested to the ending  redeemable  value.
Quotations  of  "overall  return"  are the same as "total  return"  except  that
"overall return" calculations do not deduct the sales charge.
<TABLE>
<CAPTION>

     PERFORMANCE  FIGURES
     ---------------------------------------------------------------------------------------------------------------
     FOR PERIODS ENDING DECEMBER 31, 1997         AVERAGE ANNUAL TOTAL RETURN          AVERAGE ANNUAL OVERALL RETURN
     --------------------------------------------------------------------------------------------------------------- 
     <S>                                          <C>                                  <C>   
     One Year                                               25.16%                             29.70%
     Five Years                                             13.06%                             13.87%
     Ten Years                                              16.11%                             16.52%
<FN>

     Total return is the return to an individual shareholder after paying the maximum sales charge.
                 
     Overall return gives the investment  performance  of the Fund.  Overall return does not take into account  payment of the sales
     charge.  This return figure should be used for  comparative  purposes such as comparing  The Parnassus  Fund's  performance  to
     published returns in newspapers and magazines.
</FN>
</TABLE>


     The Fund may also advertise its  cumulative  total return for prior periods
and compare its  performance to the  performance of other selected mutual funds,
selected  market  indicators  such as the Standard & Poor's 500 Composite  Stock
Price Index or non-market indices or averages of mutual fund industry groups.

     The Fund may quote its  performance  rankings  and/or other  information as
published  by  recognized  independent  mutual fund  statistical  services or by
publications of general  interest.  In connection  with a ranking,  the Fund may
provide  additional  information,  such as the particular  category to which the
ranking relates,  the number of funds in that category,  the criteria upon which
the  ranking  is based,  and the effect of sales  charges,  fee  waivers  and/or
expense reimbursements.
    

     All Fund  performance  information  is  historical  and is not  intended to
represent or guarantee  future  results.  The value of Fund shares when redeemed
may be more or less than their original cost.

     The  Fund's  annual  report  contains  additional  performance  information
including a discussion by management. You may obtain a copy of the annual report
without charge by calling or writing the Fund.


                                       12

<PAGE>
GENERAL INFORMATION
- -------------------

     The Fund was organized as a  Massachusetts  business trust on April 4,1984.
The  Declaration of Trust provides the Trustees will not be liable for errors of
judgement  or mistakes of fact or law, but nothing in the  Declaration  of Trust
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless disregard of the duties involved in the conduct of his or her office.

     Shareholders  are  entitled  to one vote  for each  full  share  held  (and
fractional votes for fractional shares) and may vote in the election of Trustees
and  on  other  matters  submitted  to  meetings  of  shareholders.  It  is  not
contemplated  that regular  annual  meetings of  shareholders  will be held. The
Declaration of Trust provides that the Fund's  shareholders have the right, upon
the  declaration in writing or vote of more than  two-thirds of its  outstanding
shares, to remove a Trustee. The Trustees will call a meeting of shareholders to
vote on the removal of a Trustee upon the written  request of the record holders
of ten per cent of its shares. In addition,  ten shareholders holding the lesser
of $25,000  worth or one  percent of Fund  shares  may  advise the  Trustees  in
writing that they wish to communicate with other shareholders for the purpose of
requesting a meeting to remove a Trustee.  The Trustees  will then, if requested
by the applicants, mail at the applicants' expense the applicants' communication
to all  other  shareholders.  The  holders  of  shares  have no  pre-emptive  or
conversion rights. Shares when issued are fully paid and non-assessable,  except
as set forth above.  The Fund may be  terminated  upon the sale of its assets to
another issuer, if such sale is approved by the vote of the holders of more than
50% of its  outstanding  shares,  or upon  liquidation  and  distribution of its
assets,  if  approved  by the  vote  of the  holders  of  more  than  50% of its
outstanding shares. If not so terminated, the Fund will continue indefinitely.

     Parnassus Investments may also arrange for third parties to provide certain
services  including  account  maintenance,   recordkeeping  and  other  personal
services to their clients who invest in the Fund. For these  services,  the Fund
may pay Parnassus  Investments an aggregate  service fee at a rate not to exceed
0.25% per annum of the Fund's  average daily net assets.  Parnassus  Investments
will not keep any of this fee for  itself,  but will  instead use the fee to pay
the third-party  service  providers.  (Service  providers who do not maintain an
omnibus  account for their  clients  will be limited to a fee of 0.10% per annum
paid by the Fund. Parnassus Investments,  however, may elect to pay such service
providers an additional 0.15% from its own funds for a total not to exceed 0.25%
per annum.)

     Deloitte & Touche LLP, 50 Fremont Street, San Francisco,  California 94105,
has been selected as the Fund's independent auditors.

   
     Union Bank of California,  475 Sansome  Street,  San Francisco,  California
94111, has been selected as the custodian of the Fund's assets.

     Parnassus  Investments,  One  Market-Steuart  Tower #1600,  San  Francisco,
California 94105, is the Fund's transfer agent and accounting  agent.  Jerome L.
Dodson, the Fund's President, is the sole stockholder of Parnassus Investments.
    

























                                       13



<PAGE>


INVESTMENT ADVISER
Parnassus Investments
One Market-Steuart Tower #1600
San Francisco, California 94105

LEGAL COUNSEL
Richard D. Silberman, Esq.
465 California Street #1020
San Francisco, California 94104

AUDITORS
Deloitte & Touche LLP
50 Fremont Street
San Francisco, California 94105

CUSTODIAN
Union Bank of California
475 Sansome Street
San Francisco, California 94111

DISTRIBUTOR
Parnassus Investments
One Market-Steuart Tower #1600
San Francisco, California 94105

   
www.parnassus.com
    























                                       14
















                               The Parnassus Fund
                                   One Market
                               Steuart Tower #1600
                             San Francisco, CA 94105
                                 (415) 778-0200



                STATEMENT OF ADDITIONAL INFORMATION April 1, 1998




   
This Statement of Additional Information is not a prospectus.  It should be read
in conjunction  with the Fund's  prospectus dated April 1, 1998, a copy of which
may be obtained by calling or writing the Fund at the address listed above.
    



<TABLE>
<CAPTION>

   
                                TABLE OF CONTENTS

                                                                                Cross-reference to
                                                              Page              page in prospectus
                                                              ----              ------------------
<S>                                                           <C>               <C>
Investment Objective and Policies                              B-2                       4
   Investment Restrictions                                     B-2
   Operating Policies                                          B-3                       5
   Repurchase Agreements                                       B-3
   Lending Portfolio Securities                                B-3
Management                                                     B-4                       6
Performance                                                    B-7                      12
Net Asset Value                                                B-7                      10
Shareholder Services                                           B-7                       8
General                                                        B-8                      13
Financial Statements                                           B-9
</TABLE>
    

<PAGE>
                       Investment Objectives and Policies

   
         The investment  objective of the Fund is to realize long-term growth of
capital. The Fund's strategy with respect to the composition of its portfolio is
described in the prospectus.


Investment Restrictions
- -----------------------

         The Fund has adopted the following  restrictions  (in addition to those
indicated in the  prospectus) as  fundamental  policies which may not be changed
without  the  approval  of  the  holders  of a  "majority"  (as  defined  in the
Investment  Company  Act of 1940  (the  "1940  Act") of the  Fund's  outstanding
shares.  A vote of the  holders of a  "majority"  (as so  defined) of the Fund's
outstanding  shares  means a vote of the holders of the lesser of (i) 67% of the
shares represented at a meeting at which more than 50% of the outstanding shares
are represented or (ii) more than 50% of the outstanding shares.

The Fund may not:

   (1) With respect to 75% of its total net assets, purchase any security, other
than  obligations  of the U.S.  Government,  its  agencies or  instrumentalities
("U.S. Government  securities"),  if as a result: (i) more than 5% of the Fund's
total net assets would then be invested in securities of a single issuer or (ii)
the Fund would hold more than 10% of the  outstanding  voting  securities of any
one issuer.

   (2) Purchase any security if, as a result, the Fund would have 25% or more of
its net assets (at current value) invested in a single industry.

   (3) Purchase  securities  on margin (but the Fund may obtain such  short-term
credits as may be necessary for the clearance of transactions).

   (4) Make short sales of  securities,  purchase  on margin or  purchase  puts,
calls, straddles or spreads.

   (5) Issue senior  securities,  borrow money or pledge its assets  except that
the Fund may borrow from a bank for  temporary or emergency  purposes in amounts
not  exceeding  10% (taken at the lower of cost or  current  value) of its total
assets (not including the amount  borrowed) and pledge its assets to secure such
borrowings.  The Fund will not make additional  purchases  while  borrowings are
outstanding.

   (6)  Buy  or  sell  commodities  or  commodity  contracts  including  futures
contracts or real estate, real estate limited partnerships or other interests in
real estate  although it may purchase and sell  securities  which are secured by
real estate and securities of companies which invest or deal in real estate.

   (7) Act as  underwriter  except to the  extent  that in  connection  with the
disposition of portfolio securities, it may be deemed to be an underwriter under
certain federal securities laws.

   (8)  Participate  on a joint  (or  joint and  several)  basis in any  trading
account in securities.

   (9) Invest in securities of other registered investment companies except that
the Fund may  invest up to 10% of its assets  (taken at current  value) in other
funds,  but no more  than 5% of its  assets in any one fund and the Fund may not
own more than 3% of the outstanding voting shares of any one fund except as part
of a merger, consolidation or other acquisition.

   (10)  Invest  in  interests  in oil,  gas or  other  mineral  exploration  or
development  programs or in oil,  gas or other  mineral  leases  although it may
invest in the  common  stocks of  companies  which  invest  in or  sponsor  such
programs.
    

                                       B-2
<PAGE>
   
   (11) Make loans except through repurchase  agreements;  however, the Fund may
engage in  securities  lending and may also  acquire debt  securities  and other
obligations  consistent  with the  Fund's  investment  objective  and its  other
investment  policies and  restrictions.  Investing in a debt  instrument that is
convertible  into equity or investing in a community loan fund is not considered
the making of a loan.
    

Operating Policies
- ------------------
   
     The Fund has adopted the following  operating policies which may be changed
by a vote of the majority of the Fund's Trustees:

(1)  The Fund may purchase warrants up to a maximum of 5% of the value of its 
     total net assets.

(2)  The  Fund  may not  hold or  purchase  foreign  currency  except  as may be
     necessary in the settlement of foreign securities transactions.
    


Repurchase Agreements
- ---------------------

     The Fund may  purchase  the  following  securities  subject  to  repurchase
agreements: certificates of deposit, certain bankers' acceptances and securities
which are direct  obligations of, or that are fully  guaranteed as to principal,
by the United States or any agency or  instrumentality  of the United States.  A
repurchase  transaction  occurs when at the time the Fund  purchases a security,
the  Fund  also  resells  it to the  vendor  (normally  a  commercial  bank or a
broker-dealer) and must deliver the security (and/or securities  substituted for
them under the repurchase agreement) to the vendor on an agreed-upon date in the
future. Such securities,  including any securities so substituted,  are referred
to as the "Resold Securities". The Adviser will consider the creditworthiness of
any vendor of repurchase  agreements and continuously  monitor the collateral so
that it never falls below the resale price. The resale price is in excess of the
purchase price in that it reflects an agreed-upon market interest rate effective
for the period of time during  which the Fund's  money is invested in the Resold
Securities.  The  majority  of  these  transactions  run from day to day and the
delivery  pursuant to the resale typically will occur within one to five days of
the purchase. The Fund's risk is limited to the ability of the vendor to pay the
agreed-upon sum upon the delivery date.

      If there is a default,  the Resold Securities  constitute security for the
repurchase obligation and will be promptly sold by the Fund. However,  there may
be delays and costs in establishing  the Fund's rights to the collateral and the
value of the collateral may decline.  The Fund will bear the risk of loss in the
event that the other party to the transaction defaults on its obligation and the
Fund is  delayed  or  prevented  from  exercising  its right to  dispose  of the
underlying securities,  including the risk of a possible decline in the value of
the  underlying  securities  during the period in which the Fund seeks to assert
its rights.

     Repurchase  agreements can be considered as loans  "collateralized"  by the
Resold  Securities  (such  agreements being defined as "loans" in the 1940 Act).
The  return  on  such  "collateral"  may be  more or less  than  that  from  the
repurchase  agreement.  The  Resold  Securities  will be marked to market  every
business  day so that the  value of the  "collateral"  is at least  equal to the
value of the loan  including the accrued  interest  earned  thereon.  All Resold
Securities  will be held by the Fund's  custodian  either  directly or through a
securities depository.


   
Lending Portfolio Securities
- ----------------------------

     To generate  additional income, the Fund may lend its portfolio  securities
to broker-dealers,  banks or other  institutional  borrowers of securities.  The
Fund  must  receive  102%  collateral  in the  form of  cash or U.S.  Government
securities. This collateral will be valued daily. Should the market value of the
loaned securities increase,  the borrower must furnish additional  collateral to
the Fund.  During the time  portfolio  securities are on loan, the borrower pays
the Fund any dividends or interest  received on such securities.  While the Fund
does not have the right to vote securities that are on loan, the Fund intends to
terminate the loan and regain the right to vote if that is considered important
    

                                       B-3
<PAGE>

with respect to the investment.  The borrower can repay the loan at any time and
the Fund can demand repayment at any time.
<TABLE>
<CAPTION>

                                   MANAGEMENT

The Trustees and Officers of the Fund are as follows:

   
                                                                         Principal Occupation
Name and Address                             Position with Fund          During Past Five Years
- -----------------------------------------------------------------------------------------------
<S>                                          <C>                         <C> 

Jerome L. Dodson*                               President                President of the Parnassus Fund and  
One Market                                      and Trustee              President and Director of Parnassus 
Steuart Tower #1600                                                      Investments since June of 1984; President and
San Francisco, CA 94105                                                  Trustee of Working Assets Money Fund from
                                                                         June 1982 until June 1984 and Trustee from
                                                                         June 1988 until December 1991. President of
                                                                         Continental Savings of America from 1976
                                                                         until 1982.

Howard Fong                             Vice President and Treasurer     Senior Vice President and Chief Financial
The Parnassus Fund                                                       Officer of Continental Savings of America 
One Market                                                               from 1979 through June of 1988; Vice  
Steuart Tower #1600                                                      President and Treasurer of the Parnassus
San Francisco, CA 94105                                                  Fund and of Parnassus Investments since
                                                                         December of 1988.

David L. Gibson                                   Trustee                Tax Counsel and later, Director of Public
5840 Geary Boulevard                                                     Affairs for the Crown Zellerbach Corporation
San Francisco, CA 94118                                                  1973-1984. Since 1984, attorney in private
                                                                         practice.

Gail L. Horvath                                   Trustee                Owner and Director of New Product
Just Desserts                                                            Development at Just Desserts.
1970 Carroll Avenue
San Francisco, CA 94124

Herbert A. Houston                                Trustee                Chief Executive Officer of the
Haight Ashbury Free Clinics                                              Haight Ashbury Free Clinics, Inc.
Presidio Building 1003
O'Reilly Avenue
San Francisco, CA 94129

Cecilia C.M. Lee                                  Trustee                President of Ultra Media, a Silicon
2048 Corporate Court                                                     Valley-based electronics firm.
San Jose, CA 95131

Leo T. McCarthy                                   Trustee                President of the Daniel Group, a
One Market                                                               partnership involved in foreign
Steuart Tower #1600                                                      trade. Directorships include Linear
San Francisco, CA 94105                                                  Technology, Open Data Systems and
                                                                         the U.S. National Gambling Impact
                                                                         Study Commission. A former member of
                                                                         the California State Assembly and
                                                                         former Lieutenant Governor of the
                                                                         State of California.
    


                                                    B-4


<PAGE>


   
Donald E. O'Connor                                Trustee                Retired. Executive for the
One Market                                                               Investment Company Institute
Steuart Tower #1600                                                      1969-1997. He currently serves as a
San Francisco, CA 94105                                                  Trustee of the Advisors Series
                                                                         Trust, another mutual fund.

Howard M. Shapiro                                 Trustee                Consultant to non-profit organizations
American Bank Building                                                   specializing in marketing, fund-raising
Portland, OR 97205                                                       organizational structure. He is Chairman
                                                                         of  the Board of  the Portland Housing
                                                                         Authority and Vice Chairman of  the
                                                                         Board of  the Albina Community Bank in
                                                                         Portland. He also serves on  the  Board
                                                                         of Oregon's State Accident Insurance Fund
                                                                         and the Multnomah County Investment Council.

Joan Shapiro                                      Trustee                Consultant in development banking, community
One Market                                                               reinvestment, ethical investing, and 
Steuart Tower #1600                                                      corporate social responsibility. Executive  
San Francisco, CA 94105                                                  with South Shore Bank of Chicago 1977-1997.
                                                                         
Richard D. Silberman                             Secretary               Attorney specializing in business
465 California St. #1020                                                 and securities law. Private practice.
San Francisco, CA 94104

<FN>

The Fund pays each of its Trustees who is not affiliated with the Adviser or the
Distributor  annual  fees of $10,500 in addition  to  reimbursement  for certain
out-of-pocket  expenses.  The  Trustees  and Officers of the Fund as a group own
less than 1% of the Fund's outstanding shares.


*"Interested" Trustee as defined in the 1940 Act.
</FN>
</TABLE>

                                 CONTROL PERSONS


     As of  December  31,  1997,  no  shareholder  owned  more  than  5% of  the
outstanding  securities of the Fund. Trustees and Officers of the Parnassus Fund
owned less than 1% of the outstanding shares.
    


The Adviser
- -----------

     Parnassus  Investments  acts  as  the  Fund's  investment  adviser.   Under
Parnassus  Investment's  Investment  Advisory  Agreement  ("Agreement") with the
Fund,  Parnassus  Investments  acts as  investment  adviser and,  subject to the
supervision  of the Board of Trustees,  directs the  investments  of the Fund in
accordance with its investment  objective,  policies and limitations.  Parnassus
Investments  also provides the Fund with all  necessary  office  facilities  and
personnel for servicing the Fund's investments and pays the salaries and fees of
all  officers  and  all  Trustees  of the  Fund  who are  "interested  persons."
Parnassus  Investments also provides the management and administrative  services
necessary for the operation of the Fund including supervising relations with the
custodian,  transfer agent,  independent accountants and attorneys.  The Adviser
also  prepares all  shareholder  communication,  maintains  the Fund's  records,
registers the Fund's shares under state and federal laws and does the staff work
for the Board of Trustees.

   
     The Agreement provides that the Adviser shall not be liable to the Fund for
any loss to the Fund except by reason of the Adviser's willful misfeasance,  bad
faith or gross negligence in the performance of its duties,  or by reason of its
reckless disregard of its obligations and duties under the Agreement.
    

                                       B-5
<PAGE>

   
     The Fund pays the Adviser a fee for  services  performed at the annual rate
of 1% of the Fund's  average daily net assets up to $10 million,  then declining
to 0.75% of assets above $10 million up to $30 million,  0.70% above $30 million
up to $100  million,  0.65%  above $100  million to $200  million,  0.60% of the
amount above $200 million.  Any such reductions are accrued and paid in the same
manner as the  Adviser's  fee and are subject to  readjustment  during the year.
During 1995,  1996 and 1997,  the Fund paid to Parnassus  Investments  under the
investment advisory contract the sums of $1,582,602,  $1,736,345 and $2,120,608,
respectively.

     As  the  Fund's  underwriter,  Parnassus  Investments  makes  a  continuous
offering of the Fund's shares and receives fees and commissions for distributing
the Fund's  shares.  For 1995,  1996 and 1997,  Parnassus  Investments  received
$1,897,143, $663,213 and $447,056,  respectively, of which amounts the following
was  paid to  other  broker/dealers:  $564,362  in  1995,  $220,044  in 1996 and
$160,162 in 1997.
    


Portfolio Transactions and Brokerage
- ------------------------------------

     The Agreement  states that in connection with its duties to arrange for the
purchase and the sale of securities held in the portfolio of the Fund by placing
purchase  and  sale  orders  for  the  Fund,   the  Adviser  shall  select  such
broker-dealers  ("brokers") as shall, in the Adviser's judgement,  implement the
policy of the Fund to achieve  "best  execution,"  i.e.,  prompt  and  efficient
execution at the most favorable securities price. In making such selection,  the
Adviser is authorized in the  Agreement to consider the  reliability,  integrity
and  financial  condition  of the  broker.  The  Adviser is also  authorized  to
consider whether the broker provides  brokerage and/or research  services to the
Fund  and/or  other  accounts  of the  Adviser.  The  Agreement  states that the
commissions  paid to such brokers may be higher than  another  broker would have
charged if a good faith determination is made by the Adviser that the commission
is  reasonable in relation to the services  provided,  viewed in terms of either
that particular transaction or the Adviser's overall  responsibilities as to the
accounts for which it exercises investment discretion and that the Adviser shall
use its  judgement  in  determining  that the  amount  of  commissions  paid are
reasonable in relation to the value of brokerage and research  services provided
and need not place or attempt to place a specific  dollar value on such services
or on the portion of commission rates reflecting such services.

   
     The Fund recognizes in the Agreement that, on any particular transaction, a
higher  than  usual  commission  may  be  paid  due  to  the  difficulty  of the
transaction  in question.  The Adviser is also  authorized  in the  Agreement to
consider sales of Fund shares as a factor in the selection of brokers to execute
brokerage  and  principal  transactions,  subject to the  requirements  of "best
execution," as defined above.

     The  research  services  discussed  above may be in written form or through
direct  contact with  individuals  and may include  information as to particular
companies and securities as well as market,  economic or institutional areas and
information assisting the Fund in the valuation of its investments. The research
which the Adviser receives for the Fund's brokerage commissions,  whether or not
useful to the Fund, may be useful to the Adviser in managing the accounts of the
Adviser's  other  advisory  clients.  Similarly,  the research  received for the
commissions  of such  accounts  may be useful to the Fund.  To the  extent  that
electronic  or other  products  provided  by brokers are used by the Adviser for
research purposes,  the Adviser will use its best judgement to make a reasonable
allocation of the cost of the product attributable to non-research use.

     The Adviser may also use brokerage  commissions to reduce certain  expenses
of the Fund subject to "best execution." For example, the Adviser may enter into
an  agreement to have a brokerage  firm pay part or all of the Fund's  custodian
fee since this benefits the Fund's shareholders.

     In the over-the-counter market,  securities are generally traded on a "net"
basis with dealers  acting as principal for their own accounts  without a stated
commission  although the price of the security  usually includes a profit to the
dealer.  Money market  instruments  usually  trade on a "net" basis as well.  On
occasion,  certain money market  instruments  may be purchased  directly from an
issuer in which case, no commissions or discounts are paid. In underwritten
    

                                       B-6
<PAGE>

   
offerings, securities are purchased at a fixed price which includes an amount of
compensation  to the  underwriter,  generally  referred to as the  underwriter's
concession or discount.

     During 1995, 1996 and 1997, the Fund paid $578,760,  $617,143 and $574,269,
respectively, in brokerage commissions. Of those amounts, the following was paid
in conjunction with research  services:  $317,075 in 1995,  $327,624 in 1996 and
$525,000 in 1997.

     Parnassus  Investments  has clients other than the Parnassus Fund that have
objectives  similar  to the Fund.  Normally,  orders for  securities  trades are
placed separately for each client.  However,  some recommendations may result in
simultaneous  buying or selling of securities  along with the Fund. As a result,
the demand for securities being purchased or the supply of securities being sold
may  increase,  and this  could  have an  adverse  effect  on the price of those
securities.  Parnassus  Investments  does not favor one client  over  another in
making  recommendations  or placing orders,  and in some situations,  orders for
different clients may be grouped together.  In certain cases where the aggregate
order is executed in a series of  transactions at various prices on a given day,
each  participating  client's  proportionate  share of such order  reflects  the
average  price paid or received  with respect to the total order.  Also,  should
only a partial order be filled,  each client would ordinarily receive a pro rata
share of the total order.
    


                             PERFORMANCE ADVERTISING

     The Fund's average annual total return (computed in the manner described in
the  prospectus) for the one, five and ten year periods ending December 31, 1997
was 25.16%,  13.06% and 16.11%.  These results are based on historical  earnings
and  asset  value   fluctuations   and  are  not  intended  to  indicate  future
performance.


                                 NET ASSET VALUE

     In determining the net asset value of the Fund's shares, common stocks that
are listed on national securities exchanges are valued at the last sale price on
the  exchange on which each stock is  principally  traded as of the close of the
New York Stock  Exchange  (which is currently  4:00 pm New York time) or, in the
absence of recorded sales, at the average of readily  available  closing bid and
asked prices on such exchanges. Securities traded on The Nasdaq Stock Market are
also valued at the last recorded  sale price as of 4:00 pm New York time.  Other
unlisted  securities are valued at the quoted bid price in the  over-the-counter
market.  Bonds and other  fixed-income  securities  are valued by a  third-party
pricing service. Securities and other assets for which market quotations are not
readily  available are valued at their fair value as determined in good faith by
the Adviser under  procedures  established by and under the general  supervision
and responsibility of the Fund's Board of Trustees. Short-term investments which
mature in less than 60 days are valued at  amortized  cost  (unless the Board of
Trustees  determines  that this method does not  represent  fair value) if their
original  maturity was 60 days or less or by amortizing the value as of the 61st
day prior to maturity if their original term to maturity exceeded 60 days.


                              SHAREHOLDER SERVICES

Statement of Intention
- ----------------------

     Reduced  sales  charges are available to investors who enter into a written
Statement of Intention  (Letter of Intent)  providing for the purchase  within a
thirteen-month period of a specified number of shares of the Fund. All shares of
the Fund previously  purchased and still owned are also included at the then net
asset value in determining the applicable reduction.

     A  Statement  of  Intention  permits  a  purchaser  to  establish  a  total
investment   goal  to  be  achieved  by  any  number  of   investments   over  a
thirteen-month  period.  Each investment made during the period will receive the
reduced sales commission  applicable to the amount represented by the goal as if
it were a single investment. Shares totaling 3.5% of the dollar amount of the

                                       B-7
<PAGE>

Statement of Intention  will be held in escrow by the Transfer Agent in the name
of the  shareholder.  The  effective  date of a Statement  of  Intention  may be
back-dated  up to 90 days in order that  investments  made  during  this  90-day
period,  valued at purchaser's  cost,  can be applied to the  fulfillment of the
Statement of Intention goal.
     The  Statement of Intention  does not obligate the investor to purchase nor
the Fund to sell the indicated  amount.  In the event the Statement of Intention
goal is not achieved within the thirteen-month period, the purchaser is required
to pay the difference between the sales commission  otherwise  applicable to the
purchases made during this period and sales charges actually paid. Such payments
may be made directly to the Distributor  or, if not paid, the  Distributor  will
liquidate  sufficient escrowed shares to obtain such difference.  If the goal is
exceeded in an amount  which  qualifies  for a lower sales  commission,  a price
adjustment  is made by  refunding  to the  purchaser  the amount of excess sales
commissions,  if any, paid during the thirteen-month period.  Investors electing
to  purchase  shares of the Fund  pursuant to a Statement  of  Intention  should
carefully read such Statement of Intention.


Systematic Withdrawal Plan
- --------------------------

   
     A Systematic  Withdrawal  Plan (the "Plan") is available  for  shareholders
having  shares  of the Fund  with a  minimum  value of  $10,000  based  upon the
offering price.  The Plan provides for monthly checks in an amount not less than
$100 or quarterly checks in an amount not less than $200.

     Dividends and capital gain  distributions on shares held under the Plan are
invested in additional full and fractional shares at net asset value. Withdrawal
payments  should not be considered as  dividends,  yield or income.  If periodic
withdrawals   continuously   exceed   reinvested   dividends  and  capital  gain
distributions,  the shareholder's  original  investment will be  correspondingly
reduced and ultimately exhausted.
    

     Furthermore,  each  withdrawal  constitutes  a redemption of shares and any
gain or loss  realized  must be  recognized  for  federal  income tax  purposes.
Although the shareholder  may invest $10,000 or more in a Systematic  Withdrawal
Plan,  withdrawals  made  concurrently  with purchases of additional  shares are
inadvisable  because  of  the  sales  charges  applicable  to  the  purchase  of
additional shares.


Tax-Sheltered Retirement Plans
- ------------------------------

     Through  the  Distributor,   retirement  plans  are  available:  Individual
Retirement  Accounts  (IRAs)  and  Simplified  Employee  Pension  Plans  (SEPs).
Adoption  of such plans  should be on advice of legal  counsel  or tax  adviser.
Retirement  accounts  have  a  minimum  initial  investment  of  $500  and  each
subsequent  investment must be at least $50. For further  information  regarding
plan administration,  custodial fees and other details, investors should contact
the Distributor.


                                     GENERAL

   
     The Fund was organized as a Massachusetts  business trust on April 4, 1984.
Its  Declaration of Trust permits the Fund to issue an unlimited  number of full
and fractional shares of beneficial interest and to divide or combine the shares
to  a  greater  or  lesser  number  of  shares  without  thereby   changing  the
proportionate beneficial interest in the Fund. Each share represents an interest
in the  Fund  proportionately  equal  to  the  interest  of  each  other  share.
Certificates   representing   shares  will  not  be  issued.   Upon  the  Fund's
liquidation,  all shareholders  would share pro rata in its net assets available
for  distribution  to  shareholders.  If they deem it advisable  and in the best
interests of shareholders, the Board of Trustees may create additional series of
shares or classes  thereof which may have separate  assets and  liabilities  and
which may differ from each other as to dividends and other  features.  Shares of
    



                                       B-8
<PAGE>

   
each series or class thereof would be entitled to vote as a series or class only
to the extent required by the 1940 Act or as permitted by the Trustees.

     The  Declaration  of Trust  contains an express  disclaimer of  shareholder
liability  for  its  acts  or  obligations  and  requires  that  notice  of such
disclaimer be given in each agreement,  obligation or instrument entered into or
executed by the Fund or its  Trustees.  The  Declaration  of Trust  provides for
indemnification and reimbursement of expenses out of the Fund's property for any
shareholder held personally liable for its obligations. The Declaration of Trust
also provides that the Fund shall, upon request, assume the defense of any claim
made against any  shareholder  for any act or obligation of the Fund and satisfy
any judgement thereon.  Thus, while Massachusetts law permits a shareholder of a
trust  such as this to be held  personally  liable  as a partner  under  certain
circumstances,  the risk of a shareholder incurring financial loss on account of
shareholder liability is highly unlikely and is limited to the relatively remote
circumstances in which the Fund would be unable to meets its obligations.

     The  Declaration  of Trust  further  provides that the Trustees will not be
liable for errors of  judgement  or mistakes of fact or law,  but nothing in the
Declaration of Trust protects a Trustee  against any liability to which he would
otherwise  be  subject  by reason  of  willful  misfeasance,  bad  faith,  gross
negligence or reckless disregard of the duties involved in the conduct of his or
her office.

     Deloitte & Touche LLP, 50 Fremont Street, San Francisco,  California 94105,
has been selected as the Fund's independent auditors.

     Union Bank of California,  475 Sansome  Street,  San Francisco,  California
94111,  has been  selected as the  custodian of the Fund's  assets.  Shareholder
inquiries should be directed to the Fund.

     Parnassus  Investments,  One  Market-Steuart  Tower #1600,  San  Francisco,
California 94105, is the Fund's transfer agent and accounting agent. As transfer
agent,  Parnassus  Investments receives a fee of $2.30 per account per month. As
accounting  agent,  Parnassus  Investments  receives a fee of $70,000  per year.
Jerome L. Dodson,  the Fund's  President,  is the sole  stockholder of Parnassus
Investments.

                              FINANCIAL STATEMENTS

     The Fund's  Annual  Report to  Shareholders  dated  December 31,  1997,  is
expressly  incorporated  by  reference  and  made a part  of this  Statement  of
Additional  Information.  A copy of the Annual Report which  contains the Fund's
audited  financial  statements  for the year ending  December 31,  1997,  may be
obtained free of charge by writing or calling the Fund.
    
















                                       B-9


<PAGE>


                                     PART C
                                OTHER INFORMATION


Item 24. Financial Statements and Exhibits

                  (a) Financial Statements

   
                           (i)  Selected  financial  highlights  from January 1,
                           1988, through December 31, 1997, appears in Part A.

                           (ii) Audited financial  statements as of December 31,
                           1997, are incorporated by reference. These statements
                           appear in the annual report dated  December 31, 1997,
                           and  are  on  file  with  the  Commission.  Financial
                           statements    include   statement   of   assets   and
                           liabilities,  statement of  operations,  statement of
                           changes in net assets,  Portfolio of  Investments  by
                           Industry    Classification,    notes   to   financial
                           statements and independent auditors' report.

                  (b) Exhibits

                           (1) Declaration of Trust and Supplemental Declaration
                               of Trust: to follow

                           (2) By-laws: to follow

                           (3) Not applicable

                           (4) Not applicable

                           (5) Investment advisory contract: to follow

                           (6) Distribution agreement and dealer agreement: 
                               on file

                           (7) Not applicable

                           (8) Custodian agreement: on file

                           (9) Shareholder Servicing Plan and Agreement: on file

                          (10) Opinion and Consent of Counsel: on file

                          (11) Consent of Deloitte & Touche LLP: to follow

                          (12) Not applicable

                          (13) Investment letters: on file

                          (14) Individual Retirement Account Form: on file; 
                               Simplified Employee Pension Plan: on file

                          (15) Not applicable

                          (16) Schedule for computation of each performance 
                               quote: on file
    


Item 25. Persons  Controlled  by or under Common  Control with  Registrant:
         Registrant is not  controlled by or under common control with any other
         person,  except  to the  extent  Registrant  may be  deemed to be under
         common control with the Parnassus  Income Trust by virtue of having the
         same individuals as Trustees.

   
Item 26. Number of Holders of  Securities:  As of December 31, 1997,  there were
         20,550 holders of the Registrant's shares of beneficial interest.
    

Item 27. Indemnification:  Under  the  provisions  of  the Fund's Declaration of
         Trust,  the  Fund  will  indemnify  its  present  or  former  Trustees,
         officers, employees and certain other agents against liability incurred
         in such capacity except that no such person may be indemnified if there
         has been an  adjudication  of liability  against that person based on a
         finding of willful misfeasance, bad faith, gross negligence or reckless
         disregard of the duties involved in the conduct of his or her office.

   
Item 28. The Fund's investment adviser, Parnassus Investments, is the investment
         adviser to The  Parnassus  Income  Trust and also serves as  investment
         adviser for separate portfolios.

Item 29. (a) Parnassus Investments serves  as underwriter for both the Parnassus
             Fund and the Parnassus Income Trust.
    

         (b) The officers and directors of Parnassus Investments are as follows:
<TABLE>
<CAPTION>

  Name and Principal
  Business Address                           Position with Distributor              Position with Registrant
  ----------------------------------------------------------------------------------------------------------
  <S>                                        <C>                                    <C>
  Jerome L. Dodson                           President and Director                 President and Trustee
  One Market
  Steuart Tower #1600
  San Francisco, CA 94105

  Howard Fong                                Treasurer                              Vice President and
  One Market                                                                        Treasurer
  Steuart Tower #1600
  San Francisco, CA 94105

  Susan Loughridge                           Secretary                              None
  One Market
  Steuart Tower #1600
  San Francisco, CA 94105

  Thao N. Dodson                             Director                               None
  One Market
  Steuart Tower #1600
  San Francisco, CA 94105
</TABLE>

              (c) None

Item 30. Location of Accounts and Records:   All accounts, books and records are
         in  the  physical  possession  of Jerome L.  Dodson at  Registrant's
         headquarters  at One Market,  Steuart Tower #1600,  San  Francisco,  CA
         94105.

Item 31. Management Services: Discussed in Part A.

Item 32. Not applicable



<PAGE>


                                   SIGNATURES

   
Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company  Act  of  1940,  the  Registrant  certifies  that  it  meets  all of the
requirements for effectiveness of this Registration  Statement  pursuant to Rule
485 (a) under the Securities  Act of 1933 and has duly caused this  Registration
Statement  to  be  signed  on  its  behalf  by  the  undersigned,  thereto  duly
authorized,  in the City and County of San Francisco and the State of California
on the 15th day of January 1998.
    

                                             The Parnassus Fund

                                                  (Registrant)



                                             By:_____________________
                                                  Jerome L. Dodson
                                                     President

Pursuant to the  requirements of the Securities Act of 1933,  this  Registration
Statement has been signed by the following  persons in the capacities and on the
date indicated.

Signature                                Title                           Date
- ---------                                -----                           ----


                           Principal Executive Officer
                                   and Trustee
________________                                                 _______________
Jerome L. Dodson



                                    Trustee
________________                                                 _______________
Gail L. Horvath



                                    Trustee
________________                                                 _______________
David L. Gibson



                             Principle Financial and             _______________
________________               Accounting Officer
Howard Fong



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