<PAGE> PAGE 1
000 A000000 06/30/98
000 C000000 819930
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC.
001 B000000 811-5299
001 C000000 4103452000
002 A000000 100 EAST PRATT STREET
002 B000000 BALTIMORE
002 C000000 MD
002 D010000 21202
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
018 000000 Y
019 A000000 Y
019 B000000 86
019 C000000 TROWEPRICE
020 A000001 INSTINET
020 B000001 13-3443395
020 C000001 144
020 A000002 MERRILL LYNCH
020 B000002 13-5674085
020 C000002 138
020 A000003 DONALDSON LUFKIN AND JENRETTE
020 B000003 13-2741729
020 C000003 132
020 A000004 DRESDNER KLEINWORT AND BENSEN
020 B000004 13-3894311
020 C000004 125
020 A000005 PAINE WEBBER
020 B000005 13-2638166
020 C000005 114
020 A000006 BT ALEX BROWN
020 B000006 13-3311934
020 C000006 94
020 A000007 MORGAN STANLEY
020 B000007 13-2655998
020 C000007 88
020 A000008 COWEN AND CO
020 B000008 13-5616116
020 C000008 74
020 A000009 BEAR STEARNS
<PAGE> PAGE 2
020 B000009 13-3299429
020 C000009 73
020 A000010 BERNSTEIN SANFORD C AND CO
020 B000010 13-2625874
020 C000010 68
021 000000 1901
022 A000001 MORGAN STANLEY
022 B000001 13-2655998
022 C000001 149936
022 D000001 232781
022 A000002 GOLDMAN SACHS
022 B000002 13-5108880
022 C000002 185262
022 D000002 166445
022 A000003 SMITH BARNEY SHEARSON
022 B000003 13-1912900
022 C000003 159727
022 D000003 40015
022 A000004 MERRILL LYNCH
022 B000004 13-5674085
022 C000004 98505
022 D000004 60641
022 A000005 LEHMAN BROTHERS
022 B000005 13-2518466
022 C000005 83410
022 D000005 56178
022 A000006 CS FIRST BOSTON
022 B000006 13-5659485
022 C000006 66136
022 D000006 69650
022 A000007 DONALDSON LUFKIN AND JENRETTE
022 B000007 13-2741729
022 C000007 79253
022 D000007 47201
022 A000008 BT ALEX BROWN
022 B000008 13-3311934
022 C000008 53745
022 D000008 42964
022 A000009 JP MORGAN
022 B000009 13-3224016
022 C000009 24570
022 D000009 62070
022 A000010 NATIONSBANC MONTGOMERY SECURITIES
022 B000010 56-1684171
022 C000010 75751
022 D000010 8856
023 C000000 1301916
023 D000000 1233486
028 A010000 103738
028 A020000 0
028 A030000 0
<PAGE> PAGE 3
028 A040000 189438
028 B010000 108580
028 B020000 0
028 B030000 0
028 B040000 135678
028 C010000 100107
028 C020000 0
028 C030000 0
028 C040000 168633
028 D010000 114338
028 D020000 0
028 D030000 0
028 D040000 129085
028 E010000 87907
028 E020000 0
028 E030000 0
028 E040000 92737
028 F010000 97184
028 F020000 0
028 F030000 0
028 F040000 93639
028 G010000 611854
028 G020000 0
028 G030000 0
028 G040000 809210
028 H000000 0
062 A000000 N
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 Y
<PAGE> PAGE 4
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 2018649
071 B000000 2159943
071 C000000 3639437
071 D000000 56
072 A000000 6
072 B000000 3261
072 C000000 1483
072 D000000 0
072 E000000 0
072 F000000 12514
072 G000000 0
072 H000000 0
072 I000000 4693
072 J000000 61
072 K000000 80
072 L000000 163
072 M000000 8
072 N000000 115
072 O000000 0
072 P000000 0
072 Q000000 38
072 R000000 9
<PAGE> PAGE 5
072 S000000 6
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 19
072 X000000 17706
072 Y000000 0
072 Z000000 -12962
072AA000000 175754
072BB000000 0
072CC010000 394547
072CC020000 0
072DD010000 0
072DD020000 0
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 265013
074 D000000 0
074 E000000 0
074 F000000 3711751
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 6507
074 K000000 0
074 L000000 3505
074 M000000 4
074 N000000 3986780
074 O000000 76924
074 P000000 775
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 10606
074 S000000 0
074 T000000 3898475
074 U010000 122939
074 U020000 0
074 V010000 31.71
074 V020000 0.00
074 W000000 0.0000
074 X000000 233066
074 Y000000 0
075 A000000 0
075 B000000 3756748
<PAGE> PAGE 6
076 000000 0.00
077 A000000 N
078 000000 N
SIGNATURE HENRY H. HOPKINS
TITLE VICE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000819930
<NAME> TRP SCIENCE AND TECHNOLOGY FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-END> JUN-30-1998
<INVESTMENTS-AT-COST> 3282545
<INVESTMENTS-AT-VALUE> 3976764
<RECEIVABLES> 10012
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3986780
<PAYABLE-FOR-SECURITIES> 76924
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11381
<TOTAL-LIABILITIES> 88305
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3033442
<SHARES-COMMON-STOCK> 122939
<SHARES-COMMON-PRIOR> 129826
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 12962
<ACCUMULATED-NET-GAINS> 183776
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 694219
<NET-ASSETS> 3898475
<DIVIDEND-INCOME> 1483
<INTEREST-INCOME> 3261
<OTHER-INCOME> 0
<EXPENSES-NET> 17706
<NET-INVESTMENT-INCOME> (12962)
<REALIZED-GAINS-CURRENT> 175754
<APPREC-INCREASE-CURRENT> 394547
<NET-CHANGE-FROM-OPS> 557339
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20394
<NUMBER-OF-SHARES-REDEEMED> (27284)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 359983
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 8022
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 12514
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 17706
<AVERAGE-NET-ASSETS> 3756748
<PER-SHARE-NAV-BEGIN> 27.26
<PER-SHARE-NII> (.11)
<PER-SHARE-GAIN-APPREC> 4.56
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 31.71
<EXPENSE-RATIO> .95
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>