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<PAGE> PAGE 2
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<PAGE> PAGE 4
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<PAGE> PAGE 7
SIGNATURE FRANK STRAUSS
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000060332
<NAME> CGM CAPITAL DEVELOPMENT FUND
<SERIES>
<NUMBER> 1
<NAME> CGM CAPITAL DEVELOPMENT FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-END> DEC-31-1998
<INVESTMENTS-AT-COST> 660799503
<INVESTMENTS-AT-VALUE> 712471774
<RECEIVABLES> 17768066
<ASSETS-OTHER> 4616
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 730244456
<PAYABLE-FOR-SECURITIES> 8508453
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 18318039
<TOTAL-LIABILITIES> 26826492
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 654175184
<SHARES-COMMON-STOCK> 28197266
<SHARES-COMMON-PRIOR> 26808321
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2429491)
<OVERDISTRIBUTION-GAINS> 0
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<DIVIDEND-INCOME> 10233802
<INTEREST-INCOME> 140860
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<EXPENSES-NET> 7621378
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<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2753284
<DISTRIBUTIONS-OF-GAINS> 100982649
<DISTRIBUTIONS-OTHER> 1692581
<NUMBER-OF-SHARES-SOLD> 1202694
<NUMBER-OF-SHARES-REDEEMED> 3544824
<SHARES-REINVESTED> 3731075
<NET-CHANGE-IN-ASSETS> (19254940)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (120457)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6997004
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7621378
<AVERAGE-NET-ASSETS> 710212842
<PER-SHARE-NAV-BEGIN> 26.96
<PER-SHARE-NII> 0.11
<PER-SHARE-GAIN-APPREC> 2.18
<PER-SHARE-DIVIDEND> 0.11
<PER-SHARE-DISTRIBUTIONS> 4.19
<RETURNS-OF-CAPITAL> 0
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<EXPENSE-RATIO> 1.07
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<AVG-DEBT-PER-SHARE> 0
</TABLE>
February 8, 1999
To the Shareholders and Board of Trustees of the
CGM Capital Development Fund
In planning and performing our audit of the financial
statements of the CGM Capital Development Fund (the "Fund")
for the year ended December 31, 1998, we considered its
internal control, including control activities for
safeguarding securities, in order 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, not to provide assurance on internal control.
The management of the Trust 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
controls. Generally, 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 controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors
or fraud may occur and not be detected. Also, projection of
any evaluation of internal control to future periods is
subject to the risk that it may become inadequate because of
changes in conditions or that the effectiveness of the design
and operation 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 internal control components
does not reduce to a relatively low level the risk that
misstatements caused by error 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 and its operation, including controls for
safeguarding securities, that we consider to be material
weaknesses as defined above as of December 31, 1998.
This report is intended solely for the information and use of
management and the Trustees of the Fund and the Securities
and Exchange Commission.
