<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 040
<NAME> JOHN HANCOCK MEDIUM CAPITALIZATION GROWTH FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> FEB-28-2000
<PERIOD-START> MAR-01-2000
<PERIOD-END> AUG-31-2000
<INVESTMENTS-AT-COST> 20,504,359
<INVESTMENTS-AT-VALUE> 29,365,505
<RECEIVABLES> 346,006
<ASSETS-OTHER> 4,155
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 29,715,666
<PAYABLE-FOR-SECURITIES> 922,101
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 48,061
<TOTAL-LIABILITIES> 970,162
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 14,902,899
<SHARES-COMMON-STOCK> 1,407,970
<SHARES-COMMON-PRIOR> 1,748,335
<ACCUMULATED-NII-CURRENT> (64,557)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,046,016
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,861,146
<NET-ASSETS> 28,745,504
<DIVIDEND-INCOME> 29,186
<INTEREST-INCOME> 64,403
<OTHER-INCOME> 0
<EXPENSES-NET> 156,482
<NET-INVESTMENT-INCOME> (62,893)
<REALIZED-GAINS-CURRENT> 2,154,684
<APPREC-INCREASE-CURRENT> (4,314,967)
<NET-CHANGE-FROM-OPS> (2,223,176)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 918,017
<NUMBER-OF-SHARES-REDEEMED> 1,258,487
<SHARES-REINVESTED> 105
<NET-CHANGE-IN-ASSETS> (8,147,316)
<ACCUMULATED-NII-PRIOR> (1,664)
<ACCUMULATED-GAINS-PRIOR> 2,891,332
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 138,910
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 196,248
<AVERAGE-NET-ASSETS> 34,444,370
<PER-SHARE-NAV-BEGIN> 21.10
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> (0.64)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 20.42
<EXPENSE-RATIO> 0.90
</TABLE>
