PARNASSUS FUND
497, 1999-05-10
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                               THE PARNASSUS FUND
                                   PROSPECTUS
                                   MAY 1, 1999




PROSPECTUS-MAY 1, 1999
- --------------------------------------------------------------------------------
   The  Parnassus  Fund (the  "Fund") is a mutual  fund,  managed  by  Parnassus
Investments  (the "Adviser") that invests in a diversified  group of securities.
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.



TABLE OF CONTENTS
- --------------------------------------------------------------------------------
Investment Summary                      2     The Adviser                   9
Performance Information                 3     How to Purchase Shares        9
Fund Expenses                           4     How to Redeem Shares         12
The Legend of Mt. Parnassus             5     Distributions and Taxes      13
Investment Objective and Policies       5     Financial Highlights         14
Management                              7     General Information          15


THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION (SEC), AND THE SEC HAS NOT DETERMINED IF THIS PROSPECTUS IS
ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<PAGE>

INVESTMENT SUMMARY
- --------------------------------------------------------------------------------
Investment Objective and Principal Strategies

   The Parnassus Fund is a stock fund whose goal is to achieve  long-term growth
of capital.  The Fund invests  mainly in domestic  stocks and  subscribes to the
"contrarian"  strategy of  investing.  This means that the Fund's  Adviser seeks
stocks that are currently out of favor with the  investment  community,  but are
believed to be financially  sound and to have good prospects for the future.  To
determine a company's  prospects,  the Adviser reviews the company's  profit and
loss  statement,  sales and  earnings  histories,  net cash flow and outlook for
future earnings.

   The Fund takes  social as well as  financial  factors  into account in making
investment  decisions.  In general,  The Parnassus Fund looks for companies that
respect the  environment,  treat their  employees  well,  have  effective  equal
employment  opportunity policies and good community relations as well as ethical
business dealings.  The Fund will not invest in companies that are involved with
gambling or manufacture  alcohol or tobacco products.  The Fund also screens out
weapons contractors and those that generate electricity from nuclear power.


Principal Risks of Investing in the Fund

   Investing  in the Fund may  result  in a loss of  money.  When you sell  your
shares,  they may be worth more or less than what you paid for them.  The Fund's
share price changes daily based on the value of its holdings.  Stock markets are
volatile  and stock values  fluctuate in response to the fortunes of  individual
companies and in response to general  market and economic  conditions  both here
and abroad. For best results,  investors should have a long-term perspective and
plan to hold their shares for at least three years.  (Legally,  shareholders may
redeem at any time, but the fund manager recommends a minimum three-year holding
period.)


<PAGE>

Performance Information
- --------------------------------------------------------------------------------
   The bar chart below  provides an  indication of the risks of investing in The
Parnassus Fund by showing  changes in the Fund's  performance  from year to year
over a 10-year period. The returns in the chart do not include the effect of the
sales charge which would have made the returns lower.  How the Fund performed in
the past is not  necessarily  an  indication of how the Fund will perform in the
future.

   [GRAPHIC HERE]

     During the ten-year period shown in the bar chart, the highest return for a
quarter was 44.6% (quarter ending December 31, 1998) and the lowest return for a
quarter was -26.9% (quarter ending September 30, 1990).

   Below is a table comparing the performance of The Parnassus Fund with the S&P
500 index and the average growth fund followed by Lipper,  Inc. The total return
column of the table  assumes that the maximum  sales charge of 3.5% was deducted
from the initial investment. The performance figures for the average growth fund
do not deduct any sales  charges  that may apply.  Figures  are  average  annual
returns for the one, five and ten-year periods ending December 31, 1998.

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------
Periods Ending          Average Annual          S&P 500       Lipper Growth Fund
December 31, 1998        Total Return            Index              Average
- --------------------------------------------------------------------------------
<S>                         <C>                  <C>                <C>   
One Year                    (2.15%)              28.58%             22.86%
Five Years                   9.81%               24.01%             19.03%
Ten Years                   12.23%               19.18%             17.18%
<FN>

Past  performance  is no  guarantee  of future  returns.  Investment  return and
principal will fluctuate and an investor's shares,  when redeemed,  may be worth
more or less than their original cost.

The S&P 500 is the  Standard & Poor's  Composite  Index of 500 Stocks,  a widely
recognized index of common stock prices.  An individual cannot invest in the S&P
500 and the index does not take any  investing  expenses  into account as do the
figures for The Parnassus Fund and Lipper's average growth fund.
</FN>
</TABLE>

<PAGE>
FUND EXPENSES
- --------------------------------------------------------------------------------
   This table  describes  the fees and expenses  that you may pay if you buy and
hold shares of the Fund.

Shareholder Fees (paid by the investor directly)
Maximum Sales Charge (Load) Imposed on Purchases 
  (as a percentage of offering price) ..................................... 3.5%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends ................None
Redemption Fees ............................................................None

Annual Fund Operating Expenses (paid from fund assets)
Management Fees ...........................................................0.66%
12b-1 Fees .................................................................None
Other Operating Expenses ..................................................0.44%
Total Fund Operating Expenses .............................................1.10%


   The  Example  in this  table  is  intended  to help you  compare  the cost of
investing  in the Fund with the cost of investing  in other  mutual  funds.  The
Example  assumes  that you  invest  $10,000  in the  Fund  for the time  periods
indicated  and then redeem all of your shares at the end of those  periods.  The
Example also assumes  that your  investment  has a 5%* return each year and that
the Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions, your costs would be:



     One Year         Three Years          Five Years          Ten Years

       $458              $687                 $935              $1,643

   The  expenses  shown  above  are the  total  fees  paid  throughout  the time
period--not  ones you pay every year.  For  example,  the $1,643  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.

   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.  The Fund did
not engage in such directed brokerage in 1998. 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.

* The 5% figure is an example that  regulations  require all mutual funds to use
as an  illustration.  It should not be  considered a  representation  of past or
future performance.  Actual performance and expenses may be greater or less than
those shown.

<PAGE>

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.

   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.

<PAGE>

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 and compared to its intrinsic value as calculated
       by the Adviser (contrarian principle);

   2)  the issuer is  financially  sound  with  good  prospects  for the  future
       (financial principle); and

   3)  the company,  in the Adviser's judgment,  meets the social criteria below
       (social principle).


Social Policy

   The Adviser looks for certain  social  policies in the companies in which the
Fund invests.  These social  policies are: (1) treating  employees  fairly;  (2)
sound environmental protection policies; (3) a good equal employment opportunity
program;  (4) quality products and services;  (5) a record of civic  commitment;
and (6) ethical business practices. Obviously, no company will be perfect in all
categories,  but the Adviser makes value  judgments in deciding which  companies
best meet the criteria.

   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.

   The  social  criteria  of  The  Parnassus  Fund  limit  the  availability  of
investment  opportunities.  However,  the Trustees and the Adviser  believe that
there are  sufficient  investments  available  that can meet the  Fund's  social
criteria and still enable the Fund to provide a competitive rate of return.


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.

   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.

<PAGE>

MANAGEMENT
- --------------------------------------------------------------------------------
   The Trustees and officers are listed  below,  together  with their  principal
occupations during at least the past five years.

   Jerome L. Dodson*,  55, 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 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.

   David L. Gibson, 59, Trustee, is an attorney in private practice specializing
in  taxation  and  estate  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  and  environmental  issues.  He holds a  Bachelor's  degree  in
business  administration from Virginia Polytechnic Institute, an MBA from Golden
Gate  University,  a J.D. 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,   49,  Trustee,  is  co-owner  of  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.  She is a graduate of
Ohio State  University.  Ms.  Horvath is also a Trustee of The Parnassus  Income
Trust.

     Herbert A. Houston,  55, Trustee, is a health care consultant.  Previously,
he spent 12 years as the Chief  Executive  Officer  of the  Haight-Ashbury  Free
Clinics,  Inc. Mr.  Houston is on the Board of the Alameda County Medical Center
and is a Health  Commissioner for Alameda County. 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.

     Cecilia C.M. Lee, 55, Trustee,  is President of  hybridArts.com,  a Silicon
Valley-based electronics firm. She is a San Francisco Asian Art commissioner and
serves on the board of public television  station KQED. Ms. Lee is a Director of
the Tech  Museum of  Innovation  and 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, 68, Trustee, is President of the Daniel Group, a partnership
involved in foreign trade. His current  directorships  include Linear Technology
and Open Data Systems. He served eighteen years 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 admitted to practice law in California. Mr.
McCarthy  is also a Trustee of The  Parnassus  Income  Trust and a  Director  of
Forward Funds, another mutual fund.

<PAGE>

   Donald E. O'Connor, 62, Trustee, 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,  67, Trustee, 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, 56, Trustee, is a consultant in corporate social responsibility
development  banking and community  reinvestment.  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, 53, 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 1989.  Mr.  Fong
graduated  from  San  Francisco  State  University  with a  degree  in  business
administration.  Mr. Fong is also Vice  President and Treasurer of The Parnassus
Income Trust.

     Susan Loughridge,  50, Vice President and Shareholder Services Manager. Ms.
Loughridge is a graduate of  University  of Arizona.  She began her career as an
examiner  for the  Federal  Home Loan Bank  Board and later  joined  Continental
Savings  where she  managed  Branch  Operations  until  1991.  She has served as
Shareholder Services Manager at Parnassus Investments since 1993. Ms. Loughridge
is also Vice President of The Parnassus Income Trust.

   Richard D. Silberman,  61, 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.  Mr.  Silberman is also  Secretary and general  counsel of The
Parnassus Income Trust.


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

<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.  It  supervises  and arranges the
purchase and sale of securities  held in the portfolio of the Fund.  The Adviser
has had 14 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. The fee
is  computed  and  payable  at the  end of  each  month.  The  following  annual
percentages of the Fund's average daily net assets are used:  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 1998,  the Fund paid the Adviser  0.66% of its  average  daily net
assets.


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  Association  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>

- ----------------------------------------------------------------------------------------------------------
                                                                                          Dealer Discount
   Sales Charge as a Percentage of                    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>

<PAGE>

   The  types  of  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.  To receive the reduced  sales
charge,  you can complete the "letter of intent"  section on the  application or
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.


<PAGE>

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.  Additional investments for all
accounts must be at least $50. With additional 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.


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

   All orders places with  broker-dealers  must be received by the Fund prior to
1:00 p.m.  San  Francisco  time in order to be  processed  that  day.  Any order
received  after 1:00 p.m.  will be processed  the  following  business  day. The
broker-dealer  is  responsible  for placing  purchase  orders  promptly with the
Distributor and for forwarding payment within three business days.

<PAGE>

Net Asset Value

   The Fund's net asset value (NAV) per share is usually calculated at 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").  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

   If a shareholder wishes to use telephone transfer privileges,  he or she must
indicate this 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.


<PAGE>

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 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.
Wiring  funds will  require an original  signature  guarantee.  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 a 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 reserves
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.


<PAGE>

DISTRIBUTIONS AND 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.  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 amount paid to them. Holders of
IRAs and other  tax-deferred  retirement  accounts are not required to pay taxes
until distribution.

   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.  An  exchange of the Fund's
shares for shares of another fund will be treated as a sale of the Fund's shares
for tax  purposes  and any gain on the  transaction  may be subject to state and
federal income tax. Annually,  you will receive IRS Form 1099 showing the dollar
amount and tax status of all distributions you received.

   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 U.S. 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.  Individuals do not qualify for this
deduction -- only corporations.

   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.

<PAGE>

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
   The financial  highlights table is intended to help you understand the Fund's
financial  performance  for the past five years.  Certain  information  reflects
financial  results  for a single  Fund  share.  The total  returns  in the table
represent  the rate that an investor  would have earned on an  investment in the
Fund assuming reinvestment of all dividends and distributions.  This information
has been  audited  by  Deloitte & Touche  LLP,  independent  accountants,  whose
report,  along with the Fund's financial  statements,  is included in the Fund's
annual report. A free copy of the annual report is available upon request.
<TABLE>
<CAPTION>

                                                      1998       1997       1996        1995        1994
- ----------------------------------------------------------------------------------------------------------
<S>                                                 <C>        <C>        <C>         <C>         <C>    
Net asset value at beginning of year                $ 35.74    $ 34.39    $ 31.77     $ 32.82     $ 31.81

Income from investment operations:
Net investment income (loss)                          (0.06)     (0.14)     (0.06)       0.15        2.73
Net realized and unrealized gain on securities         0.56      10.04       3.77        0.07        1.00
     Total from investment operations                  0.50       9.90       3.71        0.22        3.73

Distributions:
Dividends from net investment income                      .--        .--        .--     (0.16)      (0.47)
Distributions from net realized gain on securities        .--    (8.55)     (1.09)      (1.11)      (2.25)
     Total distributions                               0.00      (8.55)     (1.09)      (1.27)      (2.72)
Net asset value at end of year                        36.24      35.74      34.39       31.77       32.82
Total return*                                          1.40%     29.70%     11.68%       0.62%      11.98%

Ratios/supplemental data:
Ratio of expenses to average net assets                1.10%      1.11%      1.10%       1.02%       1.14%
Ratio of net investment income (loss) to
     average net assets                              (0.09%)    (0.44%)    (0.17%)       0.54%       0.43%
Portfolio turnover rate                               99.20%     68.90%     59.60%      29.10%      28.10%
Net assets, end of year (000's)                     $302,762   $337,425   $268,235    $259,133    $160,994

<FN>

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


GENERAL INFORMATION
- --------------------------------------------------------------------------------
   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.

   One  issue  with  the  potential  to  disrupt  fund   operations  and  affect
performance  is the  inability of some  computers  to  recognize  the year 2000.
Parnassus Investments has taken steps to enable its systems to handle this issue
and has scheduled final testing for its internal systems for the middle of 1999.
The investment  adviser is also seeking  confirmation from its service providers
and business  partners that they are taking  similar steps.  These  providers of
external  systems  have  indicated  they are  working on this issue and they are
scheduled  to  complete  testing  in the  first  half of 1999.  The Fund is also
collecting  information  on  Year  2000  issues  with  regard  to its  portfolio
companies and deciding what investment  action to take in light of the findings.
Nevertheless,  there can be no assurance  that these steps will be sufficient to
avoid any adverse impact upon the Fund.



<PAGE>


                               INVESTMENT ADVISER

                              Parnassus Investments

                         One Market-Steuart Tower #1600

                         San Francisco, California 94105

                                www.parnassus.com



                              INDEPENDENT AUDITORS

                              Deloitte & Touche LLP

                                50 Fremont Street

                         San Francisco, California 94105



                                    CUSTODIAN

                            Union Bank of California

                               475 Sansome Street

                         San Francisco, California 94111



                 You can obtain additional information about The
              Parnassus Fund. A Statement of Additional Information
           (SAl) dated May 1, 1999 has been filed with the SEC and is
           incorporated in this prospectus by reference (i.e., legally
           forms a part of the prospectus). The Fund also publishes an
            annual, a semiannual and two quarterly reports each year
             that discuss the Fund's holdings and how recent market
             conditions as well as the Fund's investment strategies
             affected performance. For a free copy of any of these
               documents or to ask questions about the Fund, call
                    Parnassus Investments at (800) 999-3505.

              The SAl, the Fund's annual, semiannual and quarterly
            reports and other related materials are also available on
           the SEC's Internet site (http://www.sec.gov). You can also
           obtain copies of this information upon paying a duplicating
            fee, by writing the Public Reference Section of the SEC,
              Washington, D.C. 20549-6009. You can also review and
           copy information about the Fund, including the SAl, at the
              SEC's Public Reference Room in Washington, D.C. Call
              800-SEC-0330 for information on the operation of the
               SEC's Public Reference Room. The Investment Company
          Act of 1940. File Number for The Parnassus Fund is 811-4044.



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