<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The Merrimac Cash Portfolio
form N-SAR for the period ended June 30, 2000
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 1
<NAME> Merrimac Cash Portfolio
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 976,341,311
<INVESTMENTS-AT-VALUE> 976,341,311
<RECEIVABLES> 10,985,476
<ASSETS-OTHER> 236,352
<OTHER-ITEMS-ASSETS> 16,828
<TOTAL-ASSETS> 987,579,967
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 273,380
<TOTAL-LIABILITIES> 273,380
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 987,306,587
<SHARES-COMMON-STOCK> 0
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 987,306,587
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 35,223,104
<OTHER-INCOME> 0
<EXPENSES-NET> 1,067,589
<NET-INVESTMENT-INCOME> 34,155,515
<REALIZED-GAINS-CURRENT> (44,982)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 34,110,533
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,180,800,174
<NUMBER-OF-SHARES-REDEEMED> 3,309,097,429
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (94,186,722)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 954,417
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,067,589
<AVERAGE-NET-ASSETS> 1,129,720,553
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.19
</TABLE>
