DREYFUS CASH MANAGEMENT
NSAR-B, 2000-03-31
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SIGNATURE   JOHN B. HAMMALIAN
TITLE       SECRETARY



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Report of Independent Auditors



Board of Trustees
of Dreyfus Cash Management

     In planning and performing our audit of the financial statements of
Dreyfus Cash Management for the year ended January 31, 2000, we considered
its internal control, including control activities for safeguarding
securities, to determine our auditing procedures for the purpose of
expressing our opinion on the financial statements and to comply with the
requirements of Form N-SAR, and not to provide assurance on internal
control.

     The management of Dreyfus Cash Management is responsible for
establishing and maintaining internal control.  In fulfilling this
responsibility, estimates and judgments by management are required to assess
the expected benefits and related costs of internal control. Generally,
internal controls that are relevant to an audit pertain to the entity's
objective of preparing financial statements for external purposes that are
fairly presented in conformity with generally accepted accounting
principles.  Those internal controls include the safeguarding of assets
against unauthorized acquisition, use, or disposition.

     Because of inherent limitations in any internal control, misstatements
due to errors or fraud may occur and not be detected.  Also, projections of
any evaluation of internal control to future periods are subject to the risk
that internal control may become inadequate because of changes in
conditions, or that the degree of compliance with the policies or procedures
may deteriorate.

     Our consideration of internal control would not necessarily disclose
all matters in internal control that might be material weaknesses under
standards established by the American Institute of Certified Public
Accountants. A material weakness is a condition in which the design or
operation of one or more of the specific internal control components does
not reduce to a relatively low level the risk that errors or fraud in
amounts that would be material in relation to the financial statements being
audited may occur and not be detected within a timely period by employees in
the normal course of performing their assigned functions.  However, we noted
no matters involving internal control, including control activities for
safeguarding securities, and its operation that we consider to be material
weaknesses as defined above as of January 31, 2000.

     This report is intended solely for the information and use of the board
of trustees and management of Dreyfus Cash Management and the Securities and
Exchange Commission and is not intended to be and should not be used by
anyone other than these specified parties.




                              ERNST & YOUNG LLP
March 16, 2000


                                     -7-

918760v1
BY-LAWS
OF
DREYFUS CASH MANAGEMENT

ARTICLE 1
Agreement and Declaration of Trust and Principal Office

1.1.  Agreement and Declaration of Trust.  These By-Laws shall be subject to
the Agreement and Declaration of Trust, as from time to time in effect (the
"Declaration of Trust"), of the above-captioned Massachusetts business trust
established by the Declaration of Trust (the "Trust").

1.2.  Principal Office of the Trust.  The principal office of the Trust
shall be located in New York, New York.  Its resident agent in Massachusetts
shall be CT Corporation System, 2 Oliver Street, Boston, Massachusetts
02109, or such other person as the Trustees from time to time may select.


ARTICLE 2
Meetings of Trustees

2.1.  Regular Meetings.  Regular meetings of the Trustees may be held
without call or notice at such places and at such times as the Trustees from
time to time may determine, provided that notice of the first regular
meeting following any such determination shall be given to absent Trustees.

2.2.  Special Meetings.  Special meetings of the Trustees may be held at any
time and at any place designated in the call of the meeting when called by
the President or the Treasurer or by two or more Trustees, sufficient notice
thereof being given to each Trustee by the Secretary or an Assistant
Secretary or by the officer or the Trustees calling the meeting.

2.3.  Notice of Special Meetings.  It shall be sufficient notice to a
Trustee of a special meeting to send notice by mail at least forty-eight
hours or by telegram at least twenty-four hours before the meeting addressed
to the Trustee at his or her usual or last known business or residence
address or to give notice to him or her in person or by telephone at least
twenty-four hours before the meeting.  Notice of a meeting need not be given
to any Trustee if a written waiver of notice, executed by him or her before
or after the meeting, is filed with the records of the meeting, or to any
Trustee who attends the meeting without protesting prior thereto or at its
commencement the lack of notice to him or her.  Neither notice of a meeting
nor a waiver of a notice need specify the purposes of the meeting.

2.4.  Notice of Certain Actions by Consent.  If in accordance with the
provisions of the Declaration of Trust any action is taken by the Trustees
by a written consent of less than all of the Trustees, then prompt notice of
any such action shall be furnished to each Trustee who did not execute such
written consent, provided that the effectiveness of such action shall not be
impaired by any delay or failure to furnish such notice.


ARTICLE 3
Officers

3.1.  Enumeration; Qualification.  The officers of the Trust shall be a
President, a Treasurer, a Secretary, and such other officers, if any, as the
Trustees from time to time may in their discretion elect.  The Trust also
may have such agents as the Trustees from time to time may in their
discretion appoint.  An officer may be but need not be a Trustee or
shareholder.  Any two or more offices may be held by the same person.

3.2.  Election.  The President, the Treasurer and the Secretary shall be
elected by the Trustees upon the occurrence of any vacancy in any such
office.  Other officers, if any, may be elected or appointed by the Trustees
at any time.  Vacancies in any such other office may be filled at any time.

3.3.  Tenure.  The President, Treasurer and Secretary shall hold office in
each case until he or she sooner dies, resigns, is removed or becomes
disqualified.  Each other officer shall hold office and each agent shall
retain authority at the pleasure of the Trustees.

3.4.  Powers.  Subject to the other provisions of these By-Laws, each
officer shall have, in addition to the duties and powers herein and in the
Declaration of Trust set forth, such duties and powers as commonly are
incident to the office occupied by him or her as if the Trust were organized
as a Massachusetts business corporation or such other duties and powers as
the Trustees may from time to time designate.

3.5.  President.  Unless the Trustees otherwise provide, the President shall
preside at all meetings of the shareholders and of the Trustees.  Unless the
Trustees otherwise provide, the President shall be the chief executive
officer.

3.6.  Treasurer.  The Treasurer shall be the chief financial and accounting
officer of the Trust, and, subject to the provisions of the Declaration of
Trust and to any arrangement made by the Trustees with a custodian,
investment adviser or manager, or transfer, shareholder servicing or similar
agent, shall be in charge of the valuable papers, books of account and
accounting records of the Trust, and shall have such other duties and powers
as may be designated from time to time by the Trustees or by the President.

3.7.  Secretary.  The Secretary shall record all proceedings of the
shareholders and the Trustees in books to be kept therefor, which books or a
copy thereof shall be kept at the principal office of the Trust.  In the
absence of the Secretary from any meeting of the shareholders or Trustees,
an Assistant Secretary, or if there be none or if he or she is absent, a
temporary Secretary chosen at such meeting shall record the proceedings
thereof in the aforesaid books.

3.8.  Resignations and Removals.  Any Trustee or officer may resign at any
time by written instrument signed by him or her and delivered to the
President or Secretary or to a meeting of the Trustees.  Such resignation
shall be effective upon receipt unless specified to be effective at some
other time.  The Trustees may remove any officer elected by them with or
without cause.  Except to the extent expressly provided in a written
agreement with the Trust, no Trustee or officer resigning and no officer
removed shall have any right to any compensation for any period following
his or her resignation or removal, or any right to damages on account of
such removal.


ARTICLE 4
Committees

4.1.  Appointment.  The Trustees may appoint from their number an executive
committee and other committees.  Except as the Trustees otherwise may
determine, any such committee may make rules for conduct of its business.

4.2.  Quorum; Voting.  A majority of the members of any Committee of the
Trustees shall constitute a quorum for the transaction of business, and any
action of such a Committee may be taken at a meeting by a vote of a majority
of the members present (a quorum being present).


ARTICLE 5
Reports

The Trustees and officers shall render reports at the time and in the manner
required by the Declaration of Trust or any applicable law.  Officers and
Committees shall render such additional reports as they may deem desirable
or as may from time to time be required by the Trustees.


ARTICLE 6
Fiscal Year

The fiscal year of the Trust shall be fixed, and shall be subject to change,
by the Board of Trustees.


ARTICLE 7
Seal

The seal of the Trust shall consist of a flat-faced die with the word
"Massachusetts," together with the name of the Trust and the year of its
organization cut or engraved thereon but, unless otherwise required by the
Trustees, the seal shall not be necessary to be placed on, and in its
absence shall not impair the validity of, any document, instrument or other
paper executed and delivered by or on behalf of the Trust.


ARTICLE 8
Execution of Papers

Except as the Trustees generally or in particular cases may authorize the
execution thereof in some other manner, all deeds, leases, contracts, notes
and other obligations made by the Trustees shall be signed by the President,
any Vice President, or by the Treasurer and need not bear the seal of the
Trust.


ARTICLE 9
Issuance of Share Certificates

9.1.  Sale of Shares.  Except as otherwise determined by the Trustees, the
Trust will issue and sell for cash or securities from time to time, full and
fractional shares of its shares of beneficial interest, such shares to be
issued and sold at a price of not less than net asset value per share, as
from time to time determined in accordance with the Declaration of Trust and
these By-Laws and, in the case of fractional shares, at a proportionate
reduction in such price.  In the case of shares sold for securities, such
securities shall be valued in accordance with the provisions for determining
value of assets of the Trust as stated in the Declaration of Trust and these
By-Laws.  The officers of the Trust are severally authorized to take all
such actions as may be necessary or desirable to carry out this Section 9.1.

9.2.  Share Certificates.  In lieu of issuing certificates for shares, the
Trustees or the transfer agent either may issue receipts therefor or may
keep accounts upon the books of the Trust for the record holders of such
shares, who shall in either case, for all purposes hereunder, be deemed to
be the holders of certificates for such shares as if they had accepted such
certificates and shall be held to have expressly assented and agreed to the
terms hereof.

The Trustees at any time may authorize the issuance of share certificates.
In that event, each shareholder shall be entitled to a certificate stating
the number of shares owned by him or her, in such form as shall be
prescribed from time to time by the Trustees.  Such certificate shall be
signed by the President or Vice President and by the Treasurer or Assistant
Treasurer.  Such signatures may be facsimile if the certificate is signed by
a transfer agent, or by a registrar, other than a Trustee, officer or
employee of the Trust.  In case any officer who has signed or whose
facsimile signature has been placed on such certificate shall cease to be
such officer before such certificate is issued, it may be issued by the
Trust with the same effect as if he or she were such officer at the time of
its issue.

9.3.  Loss of Certificates.  The Trust, or if any transfer agent is
appointed for the Trust, the transfer agent with the approval of any two
officers of the Trust, is authorized to issue and countersign replacement
certificates for the shares of the Trust which have been lost, stolen or
destroyed subject to the deposit of a bond or other indemnity in such form
and with such security, if any, as the Trustees may require.

9.4.  Discontinuance of Issuance of Certificates.  The Trustees at any time
may discontinue the issuance of share certificates and by written notice to
each shareholder, may require the surrender of share certificates to the
Trust for cancellation.  Such surrender and cancellation shall not affect
the ownership of shares in the Trust.


ARTICLE 10
Indemnification

10.1.  Trustees, Officers, etc.  The Trust shall indemnify each of its
Trustees and officers (including persons who serve at the Trust's request as
directors, officers or trustees of another organization in which the Trust
has any interest as a shareholder, creditor or otherwise) (hereinafter
referred to as a "Covered Person") against all liabilities and expenses,
including but not limited to amounts paid in satisfaction of judgments, in
compromise or as fines and penalties, and counsel fees reasonably incurred
by any Covered Person in connection with the defense or disposition of any
action, suit or other proceeding, whether civil or criminal, before any
court or administrative or legislative body, in which such Covered Person
may be or may have been involved as a party or otherwise or with which such
person may be or may have been threatened, while in office or thereafter, by
reason of being or having been such a Trustee or officer, except with
respect to any matter as to which such Covered Person shall have been
finally adjudicated in a decision on the merits in any such action, suit or
other proceeding not to have acted in good faith in the reasonable belief
that such Covered Person's action was in the best interests of the Trust and
except that no Covered Person shall be indemnified against any liability to
the Trust or its Shareholders to which such Covered Person would otherwise
be subject by reason of willful misfeasance, bad faith, gross negligence or
reckless disregard of the duties involved in the conduct of such Covered
Person's office.  Expenses, including counsel fees so incurred by any such
Covered Person (but excluding amounts paid in satisfaction of judgments, in
compromise or as fines or penalties), may be paid from time to time by the
Trust in advance of the final disposition or any such action, suit or
proceeding upon receipt of an undertaking by or on behalf of such Covered
Person to repay amounts so paid to the Trust if it is ultimately determined
that indemnification of such expenses is not authorized under this Article,
provided that (a) such Covered Person shall provide security for his or her
undertaking, (b) the Trust shall be insured against losses arising by reason
of such Covered Person's failure to fulfill his or her undertaking, or (c) a
majority of the Trustees who are disinterested persons and who are not
Interested Persons (as that term is defined in the Investment Company Act of
1940) (provided that a majority of such Trustees then in office act on the
matter), or independent legal counsel in a written opinion, shall determine,
based on a review of readily available facts (but not a full trial-type
inquiry), that there is reason to believe such Covered Person ultimately
will be entitled to indemnification.

10.2.  Compromise Payment.  As to any matter disposed of (whether by a
compromise payment, pursuant to a consent decree or otherwise) without an
adjudication in a decision on the merits by a court, or by any other body
before which the proceeding was brought, that such Covered Person either (a)
did not act in good faith in the reasonable belief that such Covered
Person's action was in the best interests of the Trust or (b) is liable to
the Trust or its Shareholders by reason of willful misfeasance, bad faith,
gross negligence or reckless disregard of the duties involved in the conduct
of such Covered Person's office, indemnification shall be provided if (a)
approved as in the best interest of the Trust, after notice that it involves
such indemnification, by at least a majority of the Trustees who are
disinterested persons and are not Interested Persons (provided that a
majority of such Trustees then in office act on the matter), upon a
determination, based upon a review of readily available facts (but not a
full trial-type inquiry) that such Covered Person acted in good faith in the
reasonable belief that such Covered Person's action was in the best
interests of the Trust and is not liable to the Trust or its Shareholders by
reason of willful misfeasance, bad faith, gross negligence or reckless
disregard of the duties involved in the conduct of such Covered Person's
office, or (b) there has been obtained an opinion in writing of independent
legal counsel, based upon a review of readily available facts (but not a
full trial-type inquiry) to the effect that such Covered Person appears to
have acted in good faith in the reasonable belief that such Covered Person's
action was in the best interests of the Trust and that such indemnification
would not protect such Covered Person against any liability to the Trust to
which such Covered Person 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 office.  Any approval pursuant to this
Section shall not prevent the recovery from any Covered Person of any amount
paid to such Covered Person in accordance with this Section as
indemnification if such Covered Person is subsequently adjudicated by a
court of competent jurisdiction not to have acted in good faith in the
reasonable belief that such Covered Person's action was in the best
interests of the Trust or to have been liable to the Trust or its
shareholders by reason of willful misfeasance, bad faith, gross negligence
or reckless disregard of the duties involved in the conduct of such Covered
Person's office.

10.3.  Indemnification Not Exclusive.  The right of indemnification hereby
provided shall not be exclusive of or affect any other rights to which any
such Covered Person may be entitled.  As used in this Article 10, the term
"Covered Person" shall include such person's heirs, executors and
administrators, and a "disinterested person" is a person against whom none
of the actions, suits or other proceedings in question or another action,
suit, or other proceeding on the same or similar grounds is then or has been
pending.  Nothing contained in this Article shall affect any rights to
indemnification to which personnel of the Trust, other than Trustees and
officers, and other persons may be entitled by contract or otherwise under
law, nor the power of the Trust to purchase and maintain liability insurance
on behalf of such person.

10.4.  Limitation.  Notwithstanding any provisions in the Declaration of
Trust and these By-Laws pertaining to indemnification, all such provisions
are limited by the following undertaking set forth in the rules promulgated
by the Securities and Exchange Commission:

          In the event that a claim for indemnification is
          asserted by a Trustee, officer or controlling
          person of the Trust in connection with the
          registered securities of the Trust, the Trust will
          not make such indemnification unless (i) the Trust
          has submitted, before a court or other body, the
          question of whether the person to be indemnified
          was liable by reason of willful misfeasance, bad
          faith, gross negligence, or reckless disregard of
          duties, and has obtained a final decision on the
          merits that such person was not liable by reason
          of such conduct or (ii) in the absence of such
          decision, the Trust shall have obtained a
          reasonable determination, based upon a review of
          the facts, that such person was not liable by
          virtue of such conduct, by (a) the vote of a
          majority of Trustees who are neither interested
          persons as such term is defined in the Investment
          Company Act of 1940, nor parties to the proceeding
          or (b) an independent legal counsel in a written
          opinion.

          The Trust will not advance attorneys' fees or
          other expenses incurred by the person to be
          indemnified unless (i) the Trust shall have
          received an undertaking by or on behalf of such
          person to repay the advance unless it is
          ultimately determined that such person is entitled
          to indemnification and (ii) one of the following
          conditions shall have occurred:  (x) such person
          shall provide security for his undertaking,
          (y) the Trust shall be insured against losses
          arising by reason of any lawful advances or (z) a
          majority of the disinterested, non-party Trustees
          of the Trust, or an independent legal counsel in a
          written opinion, shall have determined that based
          on a review of readily available facts there is
          reason to believe that such person ultimately will
          be found entitled to indemnification.


ARTICLE 11
Shareholders

11.1.  Meetings.  A meeting of the shareholders shall be called by the
Secretary whenever ordered by the Trustees, or requested in writing by the
holder or holders of at least 10% of the outstanding shares entitled to vote
at such meeting.  If the meeting is a meeting of the shareholders of one or
more series or class of shares, but not a meeting of all shareholders of the
Trust, then only the shareholders of such one or more series or classes
shall be entitled to notice of and to vote at the meeting.  If the
Secretary, when so ordered or requested, refuses or neglects for more than
five days to call such meeting, the Trustees, or the shareholders so
requesting may, in the name of the Secretary, call the meeting by giving
notice thereof in the manner required when notice is given by the Secretary.

11.2.  Access to Shareholder List.  Shareholders of record may apply to the
Trustees for assistance in communicating with other shareholders for the
purpose of calling a meeting in order to vote upon the question of removal
of a Trustee.  When ten or more shareholders of record who have been such
for at least six months preceding the date of application and who hold in
the aggregate shares having a net asset value of at least $25,000 or at
least 1% of the outstanding shares, whichever is less, so apply, the
Trustees shall within five business days either:

(i)  afford to such applicants access to a list of names and addresses of
all shareholders as recorded on the books of the Trust; or

(ii) inform such applicants of the approximate number of shareholders of
record and the approximate cost of mailing material to them and, within a
reasonable time thereafter, mail materials submitted by the applicants to
all such shareholders of record.  The Trustees shall not be obligated to
mail materials which they believe to be misleading or in violation of
applicable law.

11.3.  Record Dates.  For the purpose of determining the shareholders of any
series or class who are entitled to vote or act at any meeting or any
adjournment thereof, or who are entitled to receive payment of any dividend
or of any other distribution, the Trustees from time to time may fix a time,
which shall be not more than 90 days before the date of any meeting of
shareholders or the date of payment of any dividend or of any other
distribution, as the record date for determining the shareholders of such
series or class having the right to notice of and to vote at such meeting
and any adjournment thereof or the right to receive such dividend or
distribution, and in such case only shareholders of record on such record
date shall have such right notwithstanding any transfer of shares on the
books of the Trust after the record date; or without fixing such record date
the Trustees may for any such purposes close the register or transfer books
for all or part of such period.

11.4.  Place of Meetings.  All meetings of the shareholders shall be held at
the principal office of the Trust or at such other place within the United
States as shall be designated by the Trustees or the President of the Trust.

11.5.  Notice of Meetings.  A written notice of each meeting of
shareholders, stating the place, date and hour and the purposes of the
meeting, shall be given at least ten days before the meeting to each
shareholder entitled to vote thereat by leaving such notice with him or at
his residence or usual place of business or by mailing it, postage prepaid,
and addressed to such shareholder at his address as it appears in the
records of the Trust.  Such notice shall be given by the Secretary or an
Assistant Secretary or by an officer designated by the Trustees.  No notice
of any meeting of shareholders need be given to a shareholder if a written
waiver of notice, executed before or after the meeting by such shareholder
or his attorney thereunto duly authorized, is filed with the records of the
meeting.

11.6.  Ballots.  No ballot shall be required for any election unless
requested by a shareholder present or represented at the meeting and
entitled to vote in the election.

11.7.  Proxies.  Shareholders entitled to vote may vote either in person or
by proxy in writing dated not more than six months before the meeting named
therein, which proxies shall be filed with the Secretary or other person
responsible to record the proceedings of the meeting before being voted.
Unless otherwise specifically limited by their terms, such proxies shall
entitle the holders thereof to vote at any adjournment of such meeting but
shall not be valid after the final adjournment of such meeting.  The placing
of a shareholder's name on a proxy pursuant to telephonic or electronically
transmitted instructions obtained pursuant to procedures reasonably designed
to verify that such instructions have been authorized by such shareholder
shall constitute execution of such proxy by or on behalf of such
shareholder.


ARTICLE 12
Amendments to the By-Laws

These By-Laws may be amended or repealed, in whole or in part, by a majority
of the Trustees then in office at any meeting of the Trustees, or by one or
more writings signed by such a majority.


Dated:  June 11, 1986
Amended:  December 31, 1999




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