BROWN INVESTMENT ADVISORY & TRUST CO
13F-HR/A, 2000-03-03
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13 F-E
09/30/99

0001079817
u5#oqmvv

NONE
1

J. Hieber
410-637-6895

None

13F-E
Form 13F Holdings Report

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C.  20549

FORM 13F

FORM 13F COVER PAGE

Report for the Calendar Year or Quarter

Ended: September 30, 1999

Check here if Amendment [ X ]; Amendment
Number:1
This Amendment   (Check only one.) : [   ]  is a restatement.
                        [ X  ]  adds new holdings entries.

Institutional Investment Manager Filing this Report    :

Name:          Brown Investment Advisory and Trust Company
Address:       19 South St
          Baltimore, MD  21202

13F File Number:  ??-?????

The institutional investment manager filing this report and the
person by whom
it is signed hereby represent that the person signing the report
is authorized
to submit it, that all information contained herein is true,
correct and
complete, and the t it is understood that all required items,
statements,
schedules, lists, and tables, are considered integral parts of
this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:          Gregg W. Hawes
Title:         Counsel
Phone:         410-695-6820
Signature, Place, and Date of Signing:

Gregg W. Hawes      Baltimore, MD  November 2, 1999

Report Type  (Check only one.):

[ x ] 13F Holdings Report
[  ] 13F Notice

[  ] 13F Combination Report

List of Other Managers Reporting for this Manager:
I represent that I am authorized to submit this form and that all
information in
this form and the attachments to it is true, correct and complete
and I
understand that all required items, statements and schedules are
integral parts
of this form and that the submission of any amendment represents
that all
unamended items, statements and schedules remain true, correct and
complete as
previously submitted.
I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES EXCHANGE
ACT OF 1934.

FORM 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:

Form 13F Information Table Entry Total: 522

Form 13F Information Table Value Total: 2353932












                                                          FORM 13F
PAGE     1 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

XL CAP LTD                     CL A             G98255105      480
8500 SH
SOLE    01               8500        0        0
                                                        ----------
- - - --------
                                                               480
8500

AHL SVCS INC                   COM              001296102    21530
863371 SH
SOLE    01             839271        0    24100
                                                        ----------
- - - --------
                                                             21530
863371

AES CORP                       COM              00130H105      224
3850 SH
SOLE    01               3850        0        0
                                                        ----------
- - - --------
                                                               224
3850

APAC TELESERVICES INC          COM              00185E106      130
40000 SH
DEFINED 01              40000        0        0
                                                        ----------
- - - --------
                                                               130
40000

AT&T CORP                      COM              001957109     2501
44805 SH
SOLE    01              44705        0      100
                                                              1016
18200 SH
DEFINED 01              18200        0        0
                                                        ----------
- - - --------
                                                              3516
63005

AT&T CORP                      COM LIB GRP A    001957208     1418
38594 SH
SOLE    01              38594        0        0
                                                        ----------
- - - --------
                                                              1418
38594

ATMI INC                       COM              00207R101    23403
786667 SH
SOLE    01             764667        0    22000
                                                        ----------
- - - --------
                                                             23403
786667

ABBOTT LABS                    COM              002824100    17260
380374 SH
SOLE    01             359716      250    20408
                                                              9110
200778 SH
DEFINED 01             198318     2460        0
                                                        ----------
- - - --------
                                                             26370
581152

ACNIELSEN CORP                 COM              004833109      627
20733 SH
SOLE    01              20733        0        0
                                                        ----------
- - - --------
                                                               627
20733

ADVANCED LTG TECHNOLOGIES      COM              00753C102    12350
1372182 SH
SOLE    01            1336782        0    35400
                                                        ----------
- - - --------
                                                             12350
1372182

AIR PRODS & CHEMS INC          COM              009158106     1054
26192 SH
SOLE    01              25892        0      300
                                                               522
12970 SH
DEFINED 01              11910     1060        0
                                                        ----------
- - - --------
                                                              1576
39162








                                                          FORM 13F
PAGE     2 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

ALCOA INC                      COM              013817101      248
4000 SH
SOLE    01               4000        0        0
                                                        ----------
- - - --------
                                                               248
4000

ALLIEDSIGNAL INC               COM              019512102     1012
16070 SH
SOLE    01              15370        0      700
                                                        ----------
- - - --------
                                                              1012
16070

ALLSTATE CORP                  COM              020002101      228
6356 SH
SOLE    01               6356        0        0
                                                               103
2876 SH
DEFINED 01               2876        0        0
                                                        ----------
- - - --------
                                                               331
9232

AMERICA ONLINE INC DEL         COM              02364J104     3659
33260 SH
SOLE    01              33260        0        0
                                                               319
2900 SH
DEFINED 01               2900        0        0
                                                        ----------
- - - --------
                                                              3978
36160

AMERICAN EXPRESS CO            COM              025816109     4426
34012 SH
SOLE    01              34012        0        0
                                                               234
1800 SH
DEFINED 01               1800        0        0
                                                        ----------
- - - --------
                                                              4660
35812

AMERICAN GENERAL CORP          COM              026351106     2253
29895 SH
SOLE    01              29895        0        0
                                                        ----------
- - - --------
                                                              2253
29895

AMERICAN HOME PRODS CORP       COM              026609107    14606
254562 SH
SOLE    01             238812        0    15750
                                                              2757
48046 SH
DEFINED 01              48046        0        0
                                                        ----------
- - - --------
                                                             17362
302608

AMERICAN INTL GROUP INC        COM              026874107    21975
187416 SH
SOLE    01             170997      125    16294
                                                              5364
45749 SH
DEFINED 01              44907      842        0
                                                        ----------
- - - --------
                                                             27339
233165

AMERICAN TOWER CORP            CL A             029912201     2534
105600 SH
SOLE    01             105600        0        0
                                                               307
12800 SH
DEFINED 01               3000        0     9800
                                                        ----------
- - - --------
                                                              2842
118400

AMERITECH CORP NEW             COM              030954101     1088
14801 SH
SOLE    01              13701        0     1100
                                                               662
9000 SH
DEFINED 01               9000        0        0
                                                        ----------
- - - --------
                                                              1749
23801








                                                          FORM 13F
PAGE     3 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

AMGEN INC                      COM              031162100      444
7300 SH
SOLE    01               7300        0        0
                                                               615
10100 SH
DEFINED 01              10100        0        0
                                                        ----------
- - - --------
                                                              1059
17400

ANALOG DEVICES INC             COM              032654105      291
5800 SH
SOLE    01               5800        0        0
                                                        ----------
- - - --------
                                                               291
5800

ANHEUSER BUSCH COS INC         COM              035229103      226
3185 SH
SOLE    01               3185        0        0
                                                                51
720 SH
DEFINED 01                720        0        0
                                                        ----------
- - - --------
                                                               277
3905

APOLLO GROUP INC               CL A             037604105    31298
1178311 SH
SOLE    01            1146011        0    32300
                                                        ----------
- - - --------
                                                             31298
1178311

APPLIED MATLS INC              COM              038222105       66
900 SH
SOLE    01                900        0        0
                                                               140
1900 SH
DEFINED 01               1900        0        0
                                                        ----------
- - - --------
                                                               207
2800

ARMOR HOLDINGS INC             COM              042260109      330
31600 SH
SOLE    01              31600        0        0
                                                                42
4000 SH
DEFINED 01                  0        0     4000
                                                        ----------
- - - --------
                                                               372
35600

ARTHROCARE CORP                COM              043136100    14231
694186 SH
SOLE    01             674936        0    19250
                                                        ----------
- - - --------
                                                             14231
694186

ASPECT DEV INC                 COM              045234101    19827
1071703 SH
SOLE    01            1042203        0    29500
                                                        ----------
- - - --------
                                                             19827
1071703

ASSOCIATES FIRST CAP CORP      CL A             046008108      245
5560 SH
SOLE    01               4760        0      800
                                                              1085
24594 SH
DEFINED 01              24594        0        0
                                                        ----------
- - - --------
                                                              1331
30154

ASTROPOWER INC                 COM              04644A101     6105
348873 SH
SOLE    01             339098        0     9775
                                                        ----------
- - - --------
                                                              6105
348873










                                                          FORM 13F
PAGE     4 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

ATLANTIC COAST AIRLINES HLDGS  COM              048396105    13568
714085 SH
SOLE    01             694335        0    19750
                                                        ----------
- - - --------
                                                             13568
714085

ATLANTIC RICHFIELD CO          COM              048825103      473
5660 SH
SOLE    01               5660        0        0
                                                               164
1960 SH
DEFINED 01               1960        0        0
                                                        ----------
- - - --------
                                                               637
7620

ATMEL CORP                     COM              049513104      384
14650 SH
SOLE    01              14650        0        0
                                                        ----------
- - - --------
                                                               384
14650

AURORA BIOSCIENCES CORP        COM              051920106      116
16000 SH
SOLE    01              16000        0        0
                                                        ----------
- - - --------
                                                               116
16000

AUTOMATIC DATA PROCESSING INC  COM              053015103     2037
46285 SH
SOLE    01              44485        0     1800
                                                               733
16660 SH
DEFINED 01              16660        0        0
                                                        ----------
- - - --------
                                                              2770
62945

AVADO BRANDS INC               COM              05336P108    22942
2739400 SH
SOLE    01            2663875        0    75525
                                                        ----------
- - - --------
                                                             22942
2739400

BB&T CORP                      COM              054937107      198
5390 SH
SOLE    01               5390        0        0
                                                                40
1097 SH
DEFINED 01               1097        0        0
                                                        ----------
- - - --------
                                                               238
6487

AZURIX CORP                    COM              05501M104      260
13000 SH
SOLE    01              13000        0        0
                                                        ----------
- - - --------
                                                               260
13000

BP AMOCO P L C                 SPONSORED ADR    055622104     5111
47104 SH
SOLE    01              44604        0     2500
                                                              3572
32921 SH
DEFINED 01              32921        0        0
                                                        ----------
- - - --------
                                                              8683
80025

BANK OF AMERICA CORPORATION    COM              060505104     2207
30100 SH
SOLE    01              29300        0      800
                                                               821
11197 SH
DEFINED 01              11197        0        0
                                                        ----------
- - - --------
                                                              3028
41297










                                                          FORM 13F
PAGE     5 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

BANK NEW YORK INC              COM              064057102      293
8000 SH
SOLE    01               8000        0        0
                                                        ----------
- - - --------
                                                               293
8000

BANK ONE CORP                  COM              06423A103     2608
43792 SH
SOLE    01              36532        0     7260
                                                               293
4914 SH
DEFINED 01               4914        0        0
                                                        ----------
- - - --------
                                                              2901
48706

BEA SYS INC                    COM              073325102      263
9200 SH
SOLE    01               9200        0        0
                                                        ----------
- - - --------
                                                               263
9200

BECTON DICKINSON & CO          COM              075887109      197
6560 SH
SOLE    01               6560        0        0
                                                               168
5600 SH
DEFINED 01               5600        0        0
                                                        ----------
- - - --------
                                                               365
12160

BELL ATLANTIC CORP             COM              077853109     1325
20269 SH
SOLE    01              19269        0     1000
                                                              1712
26188 SH
DEFINED 01              26188        0        0
                                                        ----------
- - - --------
                                                              3037
46457

BELLSOUTH CORP                 COM              079860102     2243
48620 SH
SOLE    01              48620        0        0
                                                              1355
29366 SH
DEFINED 01              29366        0        0
                                                        ----------
- - - --------
                                                              3597
77986

BERKSHIRE HATHAWAY INC DEL     CL B             084670207      255
114 SH
SOLE    01                114        0        0
                                                               269
120 SH
DEFINED 01                120        0        0
                                                        ----------
- - - --------
                                                               524
234

BESTFOODS                      COM              08658U101      749
15133 SH
SOLE    01              11533        0     3600
                                                               709
14330 SH
DEFINED 01              14330        0        0
                                                        ----------
- - - --------
                                                              1458
29463

BIONX IMPLANTS INC             COM              09064Q106     1878
341420 SH
SOLE    01             331820        0     9600
                                                        ----------
- - - --------
                                                              1878
341420

BLACKROCK 2001 TERM TR INC     COM              092477108      473
52500 SH
SOLE    01              52500        0        0
                                                        ----------
- - - --------
                                                               473
52500









                                                          FORM 13F
PAGE     6 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

BOEING CO                      COM              097023105      723
16440 SH
SOLE    01              16440        0        0
                                                                22
500 SH
DEFINED 01                500        0        0
                                                        ----------
- - - --------
                                                               745
16940

BRIGHT HORIZON FAMILY SOLUTION COM              109195107     7073
374734 SH
SOLE    01             364434        0    10300
                                                        ----------
- - - --------
                                                              7073
374734

BRISTOL MYERS SQUIBB CO        COM              110122108    18950
269038 SH
SOLE    01             246198      200    22640
                                                              7111
100956 SH
DEFINED 01             100006      950        0
                                                        ----------
- - - --------
                                                             26061
369994

BROADVISION INC                COM              111412102    66689
904260 SH
SOLE    01             880360        0    23900
                                                        ----------
- - - --------
                                                             66689
904260

BURLINGTON NORTHN SANTA FE CP  COM              12189T104      213
6871 SH
SOLE    01               6091        0      780
                                                                91
2948 SH
DEFINED 01               2948        0        0
                                                        ----------
- - - --------
                                                               304
9819

CBT GROUP PUB LTD              SPNSRD ADR NEW   124853300      216
13100 SH
SOLE    01              13100        0        0
                                                        ----------
- - - --------
                                                               216
13100

CBS CORP                       COM              12490K107     1712
39301 SH
SOLE    01              39301        0        0
                                                                30
700 SH
DEFINED 01                700        0        0
                                                        ----------
- - - --------
                                                              1743
40001

CIGNA CORP                     COM              125509109       27
300 SH
SOLE    01                300        0        0
                                                               761
8550 SH
DEFINED 01               8550        0        0
                                                        ----------
- - - --------
                                                               788
8850

CMS ENERGY CORP                COM              125896100     5856
139835 SH
SOLE    01             131340      200     8295
                                                               439
10480 SH
DEFINED 01               9990      490        0
                                                        ----------
- - - --------
                                                              6294
150315

CNF TRANSN INC                 COM              12612W104      241
6250 SH
SOLE    01               6250        0        0
                                                        ----------
- - - --------
                                                               241
6250









                                                          FORM 13F
PAGE     7 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

CSG SYS INTL INC               COM              126349109      249
9500 SH
SOLE    01               9500        0        0
                                                        ----------
- - - --------
                                                               249
9500

CSX CORP                       COM              126408103       45
1000 SH
SOLE    01               1000        0        0
                                                               787
17354 SH
DEFINED 01              17354        0        0
                                                        ----------
- - - --------
                                                               833
18354

CVS CORP                       COM              126650100    12677
249785 SH
SOLE    01             230500      200    19085
                                                              1572
30975 SH
DEFINED 01              30975        0        0
                                                        ----------
- - - --------
                                                             14249
280760

CAPITAL ONE FINL CORP          COM              14040H105     2163
38837 SH
SOLE    01              33437      200     5200
                                                                45
800 SH
DEFINED 01                800        0        0
                                                        ----------
- - - --------
                                                              2207
39637

CARDINAL HEALTH INC            COM              14149Y108    11587
180689 SH
SOLE    01             166039      500    14150
                                                               623
9717 SH
DEFINED 01               9717        0        0
                                                        ----------
- - - --------
                                                             12210
190406

CARNIVAL CORP                  COM              143658102    10573
218010 SH
SOLE    01             195561      250    22199
                                                               809
16675 SH
DEFINED 01              16675        0        0
                                                        ----------
- - - --------
                                                             11382
234685

CENDANT CORP                   COM              151313103    10600
517079 SH
SOLE    01             517079        0        0
                                                                81
3965 SH
DEFINED 01                  0        0     3965
                                                        ----------
- - - --------
                                                             10681
521044

CENTRAL GARDEN & PET CO        COM              153527106      228
22200 SH
SOLE    01              22200        0        0
                                                        ----------
- - - --------
                                                               228
22200

CHASE MANHATTAN CORP NEW       COM              16161A108    16347
188979 SH
SOLE    01             176588      150    12241
                                                              2507
28977 SH
DEFINED 01              28977        0        0
                                                        ----------
- - - --------
                                                             18853
217956












                                                          FORM 13F
PAGE     8 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------
CHECKFREE HOLDINGS CORP        COM              162816102   252179
6132077 SH
OTHER   01                  0        0  6132077
                                                        ----------
- - - --------
                                                            252179
6132077

CHEVRON CORPORATION            COM              166751107     8704
91557 SH
SOLE    01              82982      100     8475
                                                              2499
26293 SH
DEFINED 01              26293        0        0
                                                        ----------
- - - --------
                                                             11203
117850

CHUBB CORP                     COM              171232101      480
6903 SH
SOLE    01               3403        0     3500
                                                              2518
36225 SH
DEFINED 01              36225        0        0
                                                        ----------
- - - --------
                                                              2997
43128

CIRCUIT CITY STORE INC         CIRCT CITY GRP   172737108      108
1160 SH
SOLE    01               1160        0        0
                                                              1042
11200 SH
DEFINED 01              11200        0        0
                                                        ----------
- - - --------
                                                              1149
12360

CISCO SYS INC                  COM              17275R102    26520
411561 SH
SOLE    01             384172      200    27189
                                                              5226
81107 SH
DEFINED 01              81107        0        0
                                                        ----------
- - - --------
                                                             31746
492668

CITIGROUP INC                  COM              172967101    23101
486337 SH
SOLE    01             460055      250    26032
                                                              3267
68772 SH
DEFINED 01              68772        0        0
                                                        ----------
- - - --------
                                                             26368
555109

CLEAR CHANNEL COMMUNICATIONS   COM              184502102     3753
54435 SH
SOLE    01              54435        0        0
                                                               676
9800 SH
DEFINED 01                  0        0     9800
                                                        ----------
- - - --------
                                                              4428
64235

CLEARNET COMMUNICATIONS INC    CL A NON-VTG     184902104      286
20500 SH
SOLE    01              20500        0        0
                                                        ----------
- - - --------
                                                               286
20500

CLOROX CO DEL                  COM              189054109      442
4140 SH
SOLE    01               3740        0      400
                                                        ----------
- - - --------
                                                               442
4140

COCA COLA CO                   COM              191216100     5942
95838 SH
SOLE    01              93848        0     1990
                                                              3557
57376 SH
DEFINED 01              57376        0        0
                                                        ----------
- - - --------
                                                              9499
153214












                                                          FORM 13F
PAGE     9 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

COLGATE PALMOLIVE CO           COM              194162103    38142
387229 SH
SOLE    01             364076      300    22853
                                                              6921
70262 SH
DEFINED 01              68642     1620        0
                                                        ----------
- - - --------
                                                             45063
457491

COLLAGENEX PHARMACEUTICALS INC COM              19419B100     2215
221488 SH
SOLE    01             215538        0     5950
                                                        ----------
- - - --------
                                                              2215
221488

COMCAST CORP                   CL A SPL         200300200      316
8228 SH
SOLE    01               8228        0        0
                                                        ----------
- - - --------
                                                               316
8228

COMPAQ COMPUTER CORP           COM              204493100     5250
221656 SH
SOLE    01             199994      500    21162
                                                              1951
82366 SH
DEFINED 01              78316     4050        0
                                                        ----------
- - - --------
                                                              7201
304022

COMPUTER ASSOC INTL INC        COM              204912109    10975
200450 SH
SOLE    01             178073      250    22127
                                                              3203
58502 SH
DEFINED 01              57002     1500        0
                                                        ----------
- - - --------
                                                             14178
258952

CONSECO INC                    COM              208464107      737
24200 SH
SOLE    01              24200        0        0
                                                                43
1428 SH
DEFINED 01                428        0     1000
                                                        ----------
- - - --------
                                                               780
25628

CONSTELLATION ENERGY CORP      COM              210371100      990
33429 SH
SOLE    01              33429        0        0
                                                               226
7623 SH
DEFINED 01               7623        0        0
                                                        ----------
- - - --------
                                                              1216
41052

COUNTRYWIDE CR INDS INC DEL    COM              222372104      227
5300 SH
SOLE    01               5300        0        0
                                                        ----------
- - - --------
                                                               227
5300

COVOL TECHNOLOGIES INC         COM              223575101      205
40000 SH
DEFINED 01              40000        0        0
                                                        ----------
- - - --------
                                                               205
40000

CUMULUS MEDIA INC              CL A             231082108      330
15100 SH
SOLE    01              14700        0      400
                                                        ----------
- - - --------
                                                               330
15100










                                                          FORM 13F
PAGE    10 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

DII GROUP INC                  COM              232949107       68
1830 SH
SOLE    01               1830        0        0
                                                               344
9230 SH
DEFINED 01               9230        0        0
                                                        ----------
- - - --------
                                                               413
11060

DANA CORP                      COM              235811106      106
2292 SH
SOLE    01               2292        0        0
                                                               239
5191 SH
DEFINED 01               5191        0        0
                                                        ----------
- - - --------
                                                               345
7483

DANAHER CORP DEL               COM              235851102     2293
39450 SH
SOLE    01              38650        0      800
                                                               564
9700 SH
DEFINED 01               9700        0        0
                                                        ----------
- - - --------
                                                              2857
49150

DAYTON HUDSON CORP             COM              239753106     7547
116101 SH
SOLE    01             109886      150     6065
                                                               982
15105 SH
DEFINED 01              15105        0        0
                                                        ----------
- - - --------
                                                              8528
131206

DEERE & CO                     COM              244199105     5385
137430 SH
SOLE    01             130070      200     7160
                                                               461
11755 SH
DEFINED 01              11755        0        0
                                                        ----------
- - - --------
                                                              5846
149185

DELL COMPUTER CORP             COM              247025109     1015
27430 SH
SOLE    01              27430        0        0
                                                               134
3625 SH
DEFINED 01               3625        0        0
                                                        ----------
- - - --------
                                                              1149
31055

DISNEY WALT CO                 COM              254687106    12294
398990 SH
SOLE    01             370890        0    28100
                                                              2839
92133 SH
DEFINED 01              89233     1700     1200
                                                        ----------
- - - --------
                                                             15132
491123

DOCUMENTUM INC                 COM              256159104     8075
618195 SH
SOLE    01             600895        0    17300
                                                        ----------
- - - --------
                                                              8075
618195

DOLLAR GEN CORP                COM              256669102      459
15831 SH
SOLE    01              15831        0        0
                                                        ----------
- - - --------
                                                               459
15831












                                                          FORM 13F
PAGE    11 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

DONNELLEY R R & SONS CO        COM              257867101      408
11008 SH
SOLE    01              11008        0        0
                                                                74
2000 SH
DEFINED 01               2000        0        0
                                                        ----------
- - - --------
                                                               482
13008

DOVER CORP                     COM              260003108    10569
301963 SH
SOLE    01             279313      300    22350
                                                              7329
209410 SH
DEFINED 01             209410        0        0
                                                        ----------
- - - --------
                                                             17898
511373

DOW CHEM CO                    COM              260543103      291
2295 SH
SOLE    01               2295        0        0
                                                               556
4383 SH
DEFINED 01               4383        0        0
                                                        ----------
- - - --------
                                                               847
6678

DU PONT E I DE NEMOURS & CO    COM              263534109    19022
278460 SH
SOLE    01             262240      150    16070
                                                              3184
46611 SH
DEFINED 01              46011      600        0
                                                        ----------
- - - --------
                                                             22206
325071

DUKE ENERGY CORP               COM              264399106      370
6804 SH
SOLE    01               6804        0        0
                                                               245
4500 SH
DEFINED 01               4500        0        0
                                                        ----------
- - - --------
                                                               615
11304

DUN & BRADSTREET CORP DEL      COM              26483B106     2502
70616 SH
SOLE    01              37516        0    33100
                                                              3145
88738 SH
DEFINED 01              47706    14732    26300
                                                        ----------
- - - --------
                                                              5647
159354

E M C CORP MASS                COM              268648102      307
5580 SH
SOLE    01               5580        0        0
                                                        ----------
- - - --------
                                                               307
5580

EASTMAN KODAK CO               COM              277461109      630
9295 SH
SOLE    01               9295        0        0
                                                               256
3780 SH
DEFINED 01               3780        0        0
                                                        ----------
- - - --------
                                                               886
13075

EATON CORP                     COM              278058102      135
1471 SH
SOLE    01               1471        0        0
                                                               920
10000 SH
DEFINED 01              10000        0        0
                                                        ----------
- - - --------
                                                              1055
11471











                                                          FORM 13F
PAGE    12 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

ECLIPSYS CORP                  COM              278856109    27614
1153628 SH
SOLE    01            1121523        0    32105
                                                        ----------
- - - --------
                                                             27614
1153628

ELAN PLC                       ADR              284131208      300
10800 SH
SOLE    01              10800        0        0
                                                        ----------
- - - --------
                                                               300
10800

ELECTRONIC ARTS INC            COM              285512109      722
13300 SH
SOLE    01              13300        0        0
                                                        ----------
- - - --------
                                                               722
13300

ELECTRONIC DATA SYS NEW        COM              285661104      353
6240 SH
SOLE    01               6240        0        0
                                                               379
6700 SH
DEFINED 01               6700        0        0
                                                        ----------
- - - --------
                                                               733
12940

EMERSON ELEC CO                COM              291011104     1518
24120 SH
SOLE    01              24120        0        0
                                                               340
5400 SH
DEFINED 01               5400        0        0
                                                        ----------
- - - --------
                                                              1858
29520

ENRON CORP                     COM              293561106     1394
17046 SH
SOLE    01              17046        0        0
                                                              1075
13152 SH
DEFINED 01              13152        0        0
                                                        ----------
- - - --------
                                                              2469
30198

ENRON CORP                     PFD 2CV $10.50   293561601      475
450 SH
SOLE    01                450        0        0
                                                        ----------
- - - --------
                                                               475
450

EQUITY RESIDENTIAL PPTYS TR    SH BEN INT       29476L107      224
4982 SH
SOLE    01               4982        0        0
                                                        ----------
- - - --------
                                                               224
4982

ERICSSON L M TEL CO            ADR CL B SEK10   294821400      651
19775 SH
SOLE    01              19775        0        0
                                                               660
20024 SH
DEFINED 01              20024        0        0
                                                        ----------
- - - --------
                                                              1311
39799

EXXON CORP                     COM              302290101    34900
452507 SH
SOLE    01             437640        0    14867
                                                             25097
325410 SH
DEFINED 01             324000     1410        0
                                                        ----------
- - - --------
                                                             59997
777917










                                                          FORM 13F
PAGE    13 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

F&M BANCORP MD                 COM              302367107      555
16530 SH
SOLE    01              16530        0        0
                                                        ----------
- - - --------
                                                               555
16530

FEDERAL HOME LN MTG CORP       COM              313400301    14078
242727 SH
SOLE    01             228202        0    14525
                                                              1130
19487 SH
DEFINED 01              19487        0        0
                                                        ----------
- - - --------
                                                             15208
262214

FEDERAL NATL MTG ASSN          COM              313586109     1808
26484 SH
SOLE    01              23104        0     3380
                                                              3831
56134 SH
DEFINED 01              56134        0        0
                                                        ----------
- - - --------
                                                              5639
82618

FEDERATED DEPT STORES INC DEL  COM              31410H101      578
10920 SH
SOLE    01               9270        0     1650
                                                               541
10215 SH
DEFINED 01              10215        0        0
                                                        ----------
- - - --------
                                                              1119
21135

FIRST DATA CORP                COM              319963104      252
5150 SH
SOLE    01               5150        0        0
                                                        ----------
- - - --------
                                                               252
5150

FIRST UN CORP                  COM              337358105     1875
39786 SH
SOLE    01              39786        0        0
                                                               591
12544 SH
DEFINED 01              12544        0        0
                                                        ----------
- - - --------
                                                              2466
52330

FLOWERS INDS INC               COM              343496105       65
3000 SH
SOLE    01               3000        0        0
                                                               533
24562 SH
DEFINED 01              24562        0        0
                                                        ----------
- - - --------
                                                               598
27562

FORD MTR CO DEL                COM              345370100     1217
21555 SH
SOLE    01              21555        0        0
                                                               226
4000 SH
DEFINED 01               4000        0        0
                                                        ----------
- - - --------
                                                              1442
25555

FORTUNE BRANDS INC             COM              349631101       50
1200 SH
SOLE    01               1200        0        0
                                                               155
3750 SH
DEFINED 01               3750        0        0
                                                        ----------
- - - --------
                                                               205
4950

FORWARD AIR CORP               COM              349853101    24894
885121 SH
SOLE    01             860721        0    24400
                                                        ----------
- - - --------
                                                             24894
885121








                                                          FORM 13F
PAGE    14 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

FRANKLIN RES INC               COM              354613101     3903
96085 SH
SOLE    01              91215        0     4870
                                                               281
6913 SH
DEFINED 01               6913        0        0
                                                        ----------
- - - --------
                                                              4184
102998

GTE CORP                       COM              362320103     6667
88306 SH
SOLE    01              79421      100     8785
                                                              1306
17303 SH
DEFINED 01              16348      955        0
                                                        ----------
- - - --------
                                                              7974
105609

GANNETT INC                    COM              364730101      401
5625 SH
SOLE    01               5625        0        0
                                                               314
4400 SH
DEFINED 01               4400        0        0
                                                        ----------
- - - --------
                                                               716
10025

GAP INC DEL                    COM              364760108     5972
118559 SH
SOLE    01             111359        0     7200
                                                               340
6749 SH
DEFINED 01               6749        0        0
                                                        ----------
- - - --------
                                                              6312
125308

GENERAL ELEC CO                COM              369604103    49415
437297 SH
SOLE    01             419296        0    18001
                                                             33394
295521 SH
DEFINED 01             294919      602        0
                                                        ----------
- - - --------
                                                             82808
732818

GENERAL MLS INC                COM              370334104      273
3400 SH
SOLE    01               3400        0        0
                                                        ----------
- - - --------
                                                               273
3400

GENERAL MTRS CORP              COM              370442105      216
3268 SH
SOLE    01               3268        0        0
                                                                36
550 SH
DEFINED 01                550        0        0
                                                        ----------
- - - --------
                                                               252
3818

GENESIS HEALTH VENTURES INC    COM              371912106       66
22144 SH
SOLE    01              22144        0        0
                                                        ----------
- - - --------
                                                                66
22144

GETTY IMAGES INC               COM              374276103    20342
1077697 SH
SOLE    01            1048247        0    29450
                                                        ----------
- - - --------
                                                             20342
1077697

GILLETTE CO                    COM              375766102    14256
347719 SH
SOLE    01             325036      300    22383
                                                              1853
45200 SH
DEFINED 01              44180     1020        0
                                                        ----------
- - - --------
                                                             16110
392919








                                                          FORM 13F
PAGE    15 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

GLOBAL TELESYSTEMS GROUP       COM              37936U104     3272
40400 SH
SOLE    01              40400        0        0
                                                               389
4800 SH
DEFINED 01                  0        0     4800
                                                        ----------
- - - --------
                                                              3661
45200

GOLDEN ST BANCORP INC          WT EXP  000000   381197136       14
10450 SH
SOLE    01              10450        0        0
                                                        ----------
- - - --------
                                                                14
10450

GRAINGER W W INC               COM              384802104      492
9143 SH
SOLE    01               9143        0        0
                                                                27
500 SH
DEFINED 01                500        0        0
                                                        ----------
- - - --------
                                                               519
9643

GUIDANT CORP                   COM              401698105      153
3000 SH
SOLE    01               3000        0        0
                                                              1535
30032 SH
DEFINED 01              30032        0        0
                                                        ----------
- - - --------
                                                              1689
33032

GUILFORD PHARMACEUTICALS INC   COM              401829106     2847
223328 SH
SOLE    01             217128        0     6200
                                                        ----------
- - - --------
                                                              2847
223328

HALLIBURTON CO                 COM              406216101    12948
286146 SH
SOLE    01             263101      300    22745
                                                              2138
47255 SH
DEFINED 01              47255        0        0
                                                        ----------
- - - --------
                                                             15086
333401

HARRIS CORP DEL                COM              413875105      346
8825 SH
SOLE    01               8825        0        0
                                                        ----------
- - - --------
                                                               346
8825

HARSCO CORP                    COM              415864107     3318
103702 SH
SOLE    01             103702        0        0
                                                        ----------
- - - --------
                                                              3318
103702

HEALTH CARE PPTY INVS INC      COM              421915109      211
7300 SH
SOLE    01               7300        0        0
                                                               520
18000 SH
DEFINED 01              18000        0        0
                                                        ----------
- - - --------
                                                               731
25300

HEINZ H J CO                   COM              423074103      263
5245 SH
SOLE    01               5245        0        0
                                                                16
320 SH
DEFINED 01                320        0        0
                                                        ----------
- - - --------
                                                               279
5565









                                                          FORM 13F
PAGE    16 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

HELMERICH & PAYNE INC          COM              423452101      330
13960 SH
SOLE    01              13960        0        0
                                                        ----------
- - - --------
                                                               330
13960

HEWLETT PACKARD CO             COM              428236103    18763
186693 SH
SOLE    01             171728        0    14965
                                                              5402
53751 SH
DEFINED 01              52819      932        0
                                                        ----------
- - - --------
                                                             24165
240444

HOME DEPOT INC                 COM              437076102    15957
247637 SH
SOLE    01             235397        0    12240
                                                              4393
68175 SH
DEFINED 01              68175        0        0
                                                        ----------
- - - --------
                                                             20350
315812

HONEYWELL INC                  COM              438506107     3528
30446 SH
SOLE    01              27391        0     3055
                                                              2229
19235 SH
DEFINED 01              18510      725        0
                                                        ----------
- - - --------
                                                              5757
49681

HOST MARRIOTT CORP NEW         COM              44107P104      174
14613 SH
SOLE    01              14613        0        0
                                                                 0
10 SH
DEFINED 01                 10        0        0
                                                        ----------
- - - --------
                                                               174
14623

HYPERION 1999 TERM TR INC      COM              448913103      627
88000 SH
SOLE    01              88000        0        0
                                                               207
29000 SH
DEFINED 01              29000        0        0
                                                        ----------
- - - --------
                                                               834
117000

HYPERION 2002 TERM TR INC      COM              448915108     1441
172000 SH
SOLE    01             172000        0        0
                                                        ----------
- - - --------
                                                              1441
172000

HYPERION SOLUTIONS CORP        COM              44914M104      944
53000 SH
SOLE    01              53000        0        0
                                                               103
5800 SH
DEFINED 01                  0        0     5800
                                                        ----------
- - - --------
                                                              1047
58800

IMS HEALTH INC                 COM              449934108     2085
66707 SH
SOLE    01              16032        0    50675
                                                              4407
141038 SH
DEFINED 01              58038        0    83000
                                                        ----------
- - - --------
                                                              6492
207745

IL FORNAIO AMER CORP           COM              451926109     6595
441532 SH
SOLE    01             429132        0    12400
                                                        ----------
- - - --------
                                                              6595
441532








                                                          FORM 13F
PAGE    17 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

ILLINOIS TOOL WKS INC          COM              452308109     4699
57478 SH
SOLE    01              55578        0     1900
                                                               213
2610 SH
DEFINED 01               2610        0        0
                                                        ----------
- - - --------
                                                              4912
60088

INCYTE PHARMACEUTICALS INC     COM              45337C102     7922
299655 SH
SOLE    01             291305        0     8350
                                                        ----------
- - - --------
                                                              7922
299655

INGERSOLL RAND CO              COM              456866102    11038
170805 SH
SOLE    01             161705      150     8950
                                                               595
9204 SH
DEFINED 01               9204        0        0
                                                        ----------
- - - --------
                                                             11633
180009

INTEGRATED SYS INC             COM              45812M104    25825
2197909 SH
SOLE    01            2141109        0    56800
                                                               103
8800 SH
DEFINED 01                  0        0     8800
                                                        ----------
- - - --------
                                                             25929
2206709

INTEL CORP                     COM              458140100    26520
445719 SH
SOLE    01             423359        0    22360
                                                              8947
150376 SH
DEFINED 01             148776     1600        0
                                                        ----------
- - - --------
                                                             35468
596095

INTERNATIONAL BUSINESS MACHS   COM              459200101    13143
101688 SH
SOLE    01             101668        0       20
                                                              4535
35086 SH
DEFINED 01              35086        0        0
                                                        ----------
- - - --------
                                                             17678
136774

INTERNATIONAL FLAVORS&FRAGRANC COM              459506101      265
6025 SH
SOLE    01               6025        0        0
                                                               611
13875 SH
DEFINED 01              13875        0        0
                                                        ----------
- - - --------
                                                               876
19900

INTERPUBLIC GROUP COS INC      COM              460690100     1713
19780 SH
SOLE    01              15578        0     4202
                                                        ----------
- - - --------
                                                              1713
19780

JEFFBANKS INC                  COM              472317106      853
30000 SH
DEFINED 01              30000        0        0
                                                        ----------
- - - --------
                                                               853
30000

JOHNSON & JOHNSON              COM              478160104    17099
174476 SH
SOLE    01             164676      125     9675
                                                             11840
120813 SH
DEFINED 01             119913      900        0
                                                        ----------
- - - --------
                                                             28938
295289








                                                          FORM 13F
PAGE    18 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

KEYCORP NEW                    COM              493267108      211
6574 SH
SOLE    01               6574        0        0
                                                               276
8600 SH
DEFINED 01               8600        0        0
                                                        ----------
- - - --------
                                                               487
15174

KIMBERLY CLARK CORP            COM              494368103      558
9789 SH
SOLE    01               9789        0        0
                                                               214
3750 SH
DEFINED 01               3750        0        0
                                                        ----------
- - - --------
                                                               772
13539

LSI LOGIC CORP                 COM              502161102      235
5100 SH
SOLE    01               5100        0        0
                                                        ----------
- - - --------
                                                               235
5100

LANDAIR CORP                   COM              514757103     1779
444841 SH
SOLE    01             432641        0    12200
                                                        ----------
- - - --------
                                                              1779
444841

LEGG MASON INC                 COM              524901105     3245
84298 SH
DEFINED 01              84298        0        0
                                                        ----------
- - - --------
                                                              3245
84298

LILLY ELI & CO                 COM              532457108     5483
76555 SH
SOLE    01              74105        0     2450
                                                              2434
33985 SH
DEFINED 01              33335      650        0
                                                        ----------
- - - --------
                                                              7917
110540

LINCOLN NATL CORP IND          COM              534187109      262
5000 SH
SOLE    01               5000        0        0
                                                               102
1944 SH
DEFINED 01               1944        0        0
                                                        ----------
- - - --------
                                                               363
6944

LINEAR TECHNOLOGY CORP         COM              535678106     7001
104105 SH
SOLE    01              94785      200     9120
                                                               709
10550 SH
DEFINED 01              10550        0        0
                                                        ----------
- - - --------
                                                              7711
114655

LOCKHEED MARTIN CORP           COM              539830109      487
13082 SH
SOLE    01              13082        0        0
                                                               175
4702 SH
DEFINED 01               4702        0        0
                                                        ----------
- - - --------
                                                               662
17784

LOWES COS INC                  COM              548661107    11989
211486 SH
SOLE    01             197586      200    13700
                                                              1967
34700 SH
DEFINED 01              33390     1310        0
                                                        ----------
- - - --------
                                                             13956
246186








                                                          FORM 13F
PAGE    19 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

LUCENT TECHNOLOGIES INC        COM              549463107    14844
220114 SH
SOLE    01             209085        0    11029
                                                              4333
64256 SH
DEFINED 01              63020     1236        0
                                                        ----------
- - - --------
                                                             19177
284370

MBNA CORP                      COM              55262L100    17981
587130 SH
SOLE    01             537337      500    49293
                                                              5716
186629 SH
DEFINED 01             182777     3852        0
                                                        ----------
- - - --------
                                                             23696
773759

MCI WORLDCOM INC               COM              55268B106    27693
321778 SH
SOLE    01             302328      400    19050
                                                              7183
83461 SH
DEFINED 01              82261      700      500
                                                        ----------
- - - --------
                                                             34876
405239

MGIC INVT CORP WIS             COM              552848103      371
7638 SH
SOLE    01               3666        0     3972
                                                               145
2992 SH
DEFINED 01               2992        0        0
                                                        ----------
- - - --------
                                                               517
10630

MANUGISTICS GROUP INC          COM              565011103      691
47676 SH
SOLE    01              47676        0        0
                                                        ----------
- - - --------
                                                               691
47676

MARSH & MCLENNAN COS INC       COM              571748102      134
1772 SH
SOLE    01               1772        0        0
                                                               623
8229 SH
DEFINED 01               8229        0        0
                                                        ----------
- - - --------
                                                               757
10001

MARRIOTT INTL INC NEW          CL A             571903202     1280
34258 SH
SOLE    01              34258        0        0
                                                               241
6450 SH
DEFINED 01               6450        0        0
                                                        ----------
- - - --------
                                                              1521
40708

MARTIN MARIETTA MATLS INC      COM              573284106      100
1694 SH
SOLE    01               1694        0        0
                                                               125
2118 SH
DEFINED 01               2118        0        0
                                                        ----------
- - - --------
                                                               225
3812

MASCO CORP                     COM              574599106     1549
53650 SH
SOLE    01              45650        0     8000
                                                        ----------
- - - --------
                                                              1549
53650

MATTEL INC                     COM              577081102      216
8250 SH
SOLE    01               8250        0        0
                                                        ----------
- - - --------
                                                               216
8250








                                                          FORM 13F
PAGE    20 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

MAY DEPT STORES CO             COM              577778103      266
6502 SH
SOLE    01               6502        0        0
                                                                22
540 SH
DEFINED 01                540        0        0
                                                        ----------
- - - --------
                                                               288
7042

MCCORMICK & CO INC             COM NON VTG      579780206      600
18999 SH
SOLE    01              18909        0       90
                                                               357
11324 SH
DEFINED 01              11324        0        0
                                                        ----------
- - - --------
                                                               957
30323

MCDONALDS CORP                 COM              580135101     2516
61185 SH
SOLE    01              60315        0      870
                                                              1818
44217 SH
DEFINED 01              42385     1832        0
                                                        ----------
- - - --------
                                                              4335
105402

MCGRAW HILL COS INC            COM              580645109     1093
20268 SH
SOLE    01              18268        0     2000
                                                                76
1400 SH
DEFINED 01               1400        0        0
                                                        ----------
- - - --------
                                                              1169
21668

MCKESSON HBOC INC              COM              58155Q103       23
700 SH
SOLE    01                700        0        0
                                                              2955
91800 SH
DEFINED 01              91800        0        0
                                                        ----------
- - - --------
                                                              2977
92500

MEAD CORP                      COM              582834107      221
5300 SH
SOLE    01               5300        0        0
                                                        ----------
- - - --------
                                                               221
5300

MEDTRONIC INC                  COM              585055106    28392
364590 SH
SOLE    01             335710      200    28680
                                                              2041
26210 SH
DEFINED 01              26210        0        0
                                                        ----------
- - - --------
                                                             30434
390800

MELLON BK CORP                 COM              585509102      282
7740 SH
SOLE    01               7740        0        0
                                                                30
820 SH
DEFINED 01                820        0        0
                                                        ----------
- - - --------
                                                               311
8560

MEMBERWORKS INC                COM              586002107    28817
993704 SH
SOLE    01             966204        0    27500
                                                        ----------
- - - --------
                                                             28817
993704












                                                          FORM 13F
PAGE    21 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

MERCANTILE BANKSHARES CORP     COM              587405101     3216
90913 SH
SOLE    01              87038        0     3875
                                                              1203
34010 SH
DEFINED 01              34010        0        0
                                                        ----------
- - - --------
                                                              4419
124923

MERCK & CO INC                 COM              589331107    29813
404936 SH
SOLE    01             385176        0    19760
                                                             18803
255393 SH
DEFINED 01             253727     1666        0
                                                        ----------
- - - --------
                                                             48617
660329

METATEC INTL INC               COM              591398102      200
33334 SH
SOLE    01              33334        0        0
                                                        ----------
- - - --------
                                                               200
33334

METTLER TOLEDO INTERNATIONAL   COM              592688105      288
11300 SH
SOLE    01              11300        0        0
                                                        ----------
- - - --------
                                                               288
11300

MICROSOFT CORP                 COM              594918104    26170
290175 SH
SOLE    01             278510      150    11515
                                                              8520
94475 SH
DEFINED 01              93955      520        0
                                                        ----------
- - - --------
                                                             34690
384650

MICROCHIP TECHNOLOGY INC       COM              595017104      201
4250 SH
SOLE    01               4250        0        0
                                                        ----------
- - - --------
                                                               201
4250

MIDAMERICAN ENERGY HLDGS NEW   COM              59562V107     2244
64800 SH
SOLE    01              64800        0        0
                                                               184
5300 SH
DEFINED 01                  0        0     5300
                                                        ----------
- - - --------
                                                              2427
70100

MINNESOTA MNG & MFG CO         COM              604059105      995
11443 SH
SOLE    01              11443        0        0
                                                              1688
19413 SH
DEFINED 01              19413        0        0
                                                        ----------
- - - --------
                                                              2683
30856

MOBIL CORP                     COM              607059102    14168
143476 SH
SOLE    01             134252        0     9224
                                                              4016
40672 SH
DEFINED 01              39864      808        0
                                                        ----------
- - - --------
                                                             18185
184148

MONSANTO CO                    COM              611662107      249
6300 SH
SOLE    01               6300        0        0
                                                                29
730 SH
DEFINED 01                730        0        0
                                                        ----------
- - - --------
                                                               278
7030








                                                          FORM 13F
PAGE    22 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

MORGAN J P & CO INC            COM              616880100     1267
9021 SH
SOLE    01               9021        0        0
                                                              1429
10171 SH
DEFINED 01              10171        0        0
                                                        ----------
- - - --------
                                                              2696
19192

MORGAN STANLEY DEAN WITTER&CO  COM NEW          617446448      147
1432 SH
SOLE    01               1432        0        0
                                                                63
610 SH
DEFINED 01                610        0        0
                                                        ----------
- - - --------
                                                               210
2042

MOTOROLA INC                   COM              620076109     1656
17479 SH
SOLE    01              17479        0        0
                                                               311
3287 SH
DEFINED 01               3287        0        0
                                                        ----------
- - - --------
                                                              1968
20766

NABORS INDS INC                COM              629568106      205
8418 SH
SOLE    01               8418        0        0
                                                        ----------
- - - --------
                                                               205
8418

NETWORKS ASSOCS INC            COM              640938106      305
20800 SH
SOLE    01              20800        0        0
                                                        ----------
- - - --------
                                                               305
20800

NEWELL RUBBERMAID INC          COM              651229106     8229
177447 SH
SOLE    01             164742      550    12155
                                                              1444
31139 SH
DEFINED 01              31139        0        0
                                                        ----------
- - - --------
                                                              9673
208586

NEXTEL COMMUNICATIONS INC      CL A             65332V103     1275
25400 SH
SOLE    01              25400        0        0
                                                              1004
20000 SH
DEFINED 01              20000        0        0
                                                        ----------
- - - --------
                                                              2278
45400

NIKE INC                       CL B             654106103      257
4050 SH
SOLE    01               4000        0       50
                                                               112
1760 SH
DEFINED 01               1760        0        0
                                                        ----------
- - - --------
                                                               368
5810

NOKIA CORP                     SPONSORED ADR    654902204      330
3600 SH
SOLE    01               3600        0        0
                                                                55
600 SH
DEFINED 01                600        0        0
                                                        ----------
- - - --------
                                                               385
4200












                                                          FORM 13F
PAGE    23 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

NORFOLK SOUTHERN CORP          COM              655844108      451
14960 SH
SOLE    01              14960        0        0
                                                               624
20727 SH
DEFINED 01              20727        0        0
                                                        ----------
- - - --------
                                                              1075
35687

NOVA CORP GA                   COM              669784100      248
9900 SH
SOLE    01               9900        0        0
                                                        ----------
- - - --------
                                                               248
9900

NOVADIGM INC                   COM              669937104     1000
116000 SH
SOLE    01             113225        0     2775
                                                        ----------
- - - --------
                                                              1000
116000

NOVELL INC                     COM              670006105      636
24000 SH
SOLE    01              24000        0        0
                                                        ----------
- - - --------
                                                               636
24000

NUVEEN INSD PREM INCOME MUN 2  COM              6706D8104      140
11000 SH
SOLE    01              11000        0        0
                                                        ----------
- - - --------
                                                               140
11000

NUVEEN PREM INCOME MUN FD 4    COM              6706K4105      183
13000 SH
SOLE    01              13000        0        0
                                                        ----------
- - - --------
                                                               183
13000

O CHARLEYS INC                 COM              670823103    30327
1895440 SH
SOLE    01            1842690        0    52750
                                                        ----------
- - - --------
                                                             30327
1895440

NUVEEN MUN VALUE FD INC        COM              670928100      222
24177 SH
SOLE    01              24177        0        0
                                                                61
6600 SH
DEFINED 01               6600        0        0
                                                        ----------
- - - --------
                                                               283
30777

NUVEEN PA INVT QUALITY MUN FD  COM              670972108      279
16700 SH
SOLE    01              16700        0        0
                                                        ----------
- - - --------
                                                               279
16700

OMNICOM GROUP INC              COM              681919106      200
2500 SH
SOLE    01               2500        0        0
                                                               128
1600 SH
DEFINED 01               1600        0        0
                                                        ----------
- - - --------
                                                               328
4100












                                                          FORM 13F
PAGE    24 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

ORACLE CORP                    COM              68389X105     9929
267454 SH
SOLE    01             249644      200    17610
                                                              1058
28485 SH
DEFINED 01              28485        0        0
                                                        ----------
- - - --------
                                                             10987
295939

PE CORP                        COM PE BIO GRP   69332S102      472
4114 SH
SOLE    01               4114        0        0
                                                               184
1600 SH
DEFINED 01               1600        0        0
                                                        ----------
- - - --------
                                                               656
5714

PPG INDS INC                   COM              693506107     5740
97189 SH
SOLE    01              87219      150     9820
                                                               523
8860 SH
DEFINED 01               8860        0        0
                                                        ----------
- - - --------
                                                              6263
106049

PSS WORLD MED INC              COM              69366A100    27777
2482937 SH
SOLE    01            2414487        0    68450
                                                        ----------
- - - --------
                                                             27777
2482937

PACIFIC GATEWAY EXCHANGE INC   COM              694327107    26998
926971 SH
SOLE    01             901421        0    25550
                                                                29
1000 SH
DEFINED 01                  0        0     1000
                                                        ----------
- - - --------
                                                             27027
927971

PAPA JOHNS INTL INC            COM              698813102    24676
552206 SH
SOLE    01             536756        0    15450
                                                        ----------
- - - --------
                                                             24676
552206

PARAMETRIC TECHNOLOGY CORP     COM              699173100     5539
399240 SH
SOLE    01             376865     1000    21375
                                                               199
14370 SH
DEFINED 01              14370        0        0
                                                        ----------
- - - --------
                                                              5739
413610

PAYCHEX INC                    COM              704326107      795
24933 SH
SOLE    01              24933        0        0
                                                        ----------
- - - --------
                                                               795
24933

PEAPOD INC                     COM              704718105      332
41800 SH
SOLE    01              41800        0        0
                                                                42
5300 SH
DEFINED 01                  0        0     5300
                                                        ----------
- - - --------
                                                               374
47100

PENNEY J C INC                 COM              708160106      361
7427 SH
SOLE    01               7427        0        0
                                                               856
17632 SH
DEFINED 01              17632        0        0
                                                        ----------
- - - --------
                                                              1217
25059








                                                          FORM 13F
PAGE    25 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

PENTAIR INC                    COM              709631105     2801
61224 SH
SOLE    01              51674      250     9300
                                                                69
1500 SH
DEFINED 01               1500        0        0
                                                        ----------
- - - --------
                                                              2870
62724

PEPSICO INC                    COM              713448108    14818
383032 SH
SOLE    01             357452      300    25280
                                                              4398
113682 SH
DEFINED 01             112132     1550        0
                                                        ----------
- - - --------
                                                             19216
496714

PERCLOSE INC                   COM              71361C107    36980
769429 SH
SOLE    01             748529        0    20900
                                                        ----------
- - - --------
                                                             36980
769429

PETSMART INC                   COM              716768106    16809
1639855 SH
SOLE    01            1593905        0    45950
                                                        ----------
- - - --------
                                                             16809
1639855

PFIZER INC                     COM              717081103    11010
101005 SH
SOLE    01              83095        0    17910
                                                              9262
84975 SH
DEFINED 01              84975        0        0
                                                        ----------
- - - --------
                                                             20272
185980

PHILIP MORRIS COS INC          COM              718154107     9502
236453 SH
SOLE    01             231453        0     5000
                                                               221
5500 SH
DEFINED 01               5500        0        0
                                                        ----------
- - - --------
                                                              9723
241953

PHILLIPS PETE CO               COM              718507106      105
2094 SH
SOLE    01               2094        0        0
                                                               348
6919 SH
DEFINED 01               6919        0        0
                                                        ----------
- - - --------
                                                               453
9013

PINNACLE WEST CAP CORP         COM              723484101      962
23900 SH
SOLE    01              22200        0     1700
                                                               235
5840 SH
DEFINED 01               5840        0        0
                                                        ----------
- - - --------
                                                              1197
29740

PITNEY BOWES INC               COM              724479100      150
2339 SH
SOLE    01               2339        0        0
                                                               307
4777 SH
DEFINED 01               4777        0        0
                                                        ----------
- - - --------
                                                               457
7116












                                                          FORM 13F
PAGE    26 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

PRAXAIR INC                    COM              74005P104     3885
79387 SH
SOLE    01              71577        0     7810
                                                               240
4900 SH
DEFINED 01               4900        0        0
                                                        ----------
- - - --------
                                                              4125
84287

PRICE T ROWE & ASSOCIATES      COM              741477103      904
23545 SH
SOLE    01              19245        0     4300
                                                               461
12025 SH
DEFINED 01              12025        0        0
                                                        ----------
- - - --------
                                                              1365
35570

PROCTER & GAMBLE CO            COM              742718109     6430
72042 SH
SOLE    01              70942        0     1100
                                                              6180
69241 SH
DEFINED 01              68561      680        0
                                                        ----------
- - - --------
                                                             12610
141283

PROTECTIVE LIFE CORP           COM              743674103     3083
90669 SH
SOLE    01              90669        0        0
                                                               149
4392 SH
DEFINED 01               4392        0        0
                                                        ----------
- - - --------
                                                              3232
95061

QRS CORP                       COM              74726X105    95487
1224194 SH
SOLE    01            1190869        0    33325
                                                        ----------
- - - --------
                                                             95487
1224194

QUALCOMM INC                   COM              747525103     2597
18100 SH
SOLE    01              18100        0        0
                                                        ----------
- - - --------
                                                              2597
18100

R H DONNELLEY CORP             COM NEW          74955W307      315
16116 SH
DEFINED 01              13816        0     2300
                                                        ----------
- - - --------
                                          315  16116

RSA SEC INC                    COM              749719100    40517
1525379 SH
SOLE    01            1484079        0    41300
                                                        ----------
- - - --------
                                                             40517
1525379

RWD TECHNOLOGIES INC           COM              749927109     4843
615770 SH
SOLE    01             615770        0        0
                                                        ----------
- - - --------
                                                              4843
615770

RAILWORKS CORP                 COM              750789109     3461
374125 SH
SOLE    01             363625        0    10500
                                                        ----------
- - - --------
                                                              3461
374125

RATIONAL SOFTWARE CORP         COM NEW          75409P202     2469
74950 SH
SOLE    01              74950        0        0
                                                               438
13300 SH
DEFINED 01                  0        0    13300
                                                        ----------
- - - --------
                                                              2907
88250

RAYTHEON CO                    CL B             755111408      337
4782 SH
SOLE    01               4782        0        0
                                                               251
3560 SH
DEFINED 01               3560        0        0
                                                        ----------
- - - --------
                                                               588
8342









                                                          FORM 13F
PAGE    27 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

REYNOLDS METALS CO             COM              761763101     3579
60661 SH
DEFINED 01              60661        0        0
                                                        ----------
- - - --------
                                                              3579
60661

ROHM & HAAS CO                 COM              775371107      418
9750 SH
SOLE    01               9750        0        0
                                                                 7
164 SH
DEFINED 01                164        0        0
                                                        ----------
- - - --------
                                                               425
9914

ROSS STORES INC                COM              778296103      584
11600 SH
SOLE    01              11600        0        0
                                                        ----------
- - - --------
                                                               584
11600

ROUSE CO                       COM              779273101     2016
79449 SH
SOLE    01              79449        0        0
                                                               317
12500 SH
DEFINED 01              12500        0        0
                                                        ----------
- - - --------
                                                              2333
91949

ROYAL DUTCH PETE CO            NY REG GLD1.25   780257804     2552
42365 SH
SOLE    01              42365        0        0
                                                                84
1400 SH
DEFINED 01               1400        0        0
                                                        ----------
- - - --------
                                                              2637
43765

SBC COMMUNICATIONS INC         COM              78387G103    16965
292494 SH
SOLE    01             272229      150    20115
                                                              3554
61280 SH
DEFINED 01              60220     1060        0
                                                        ----------
- - - --------
                                                             20519
353774

SBA COMMUNICATIONS CORP        COM              78388J106      199
20500 SH
SOLE    01              20500        0        0
                                                        ----------
- - - --------
                                                               199
20500

ST JOE CO                      COM              790148100      227
8400 SH
SOLE    01               8400        0        0
                                                        ----------
- - - --------
                                                               227
8400

SANDY SPRING BANCORP INC       COM              800363103      352
12692 SH
DEFINED 01              12692        0        0
                                                        ----------
- - - --------
                                                               352
12692

SARA LEE CORP                  COM              803111103      734
32356 SH
SOLE    01              32356        0        0
                                                               299
13200 SH
DEFINED 01              13200        0        0
                                                        ----------
- - - --------
                                                              1034
45556










                                                          FORM 13F
PAGE    28 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

SCHERING PLOUGH CORP           COM              806605101     4346
82777 SH
SOLE    01              81077        0     1700
                                                              7708
146818 SH
DEFINED 01             146818        0        0
                                                        ----------
- - - --------
                                                             12054
229595

SCHLUMBERGER LTD               COM              806857108     1886
29612 SH
SOLE    01              29612        0        0
                                                               789
12388 SH
DEFINED 01              12388        0        0
                                                        ----------
- - - --------
                                                              2675
42000

SCHWAB CHARLES CORP NEW        COM              808513105     2451
22490 SH
SOLE    01              22490        0        0
                                                        ----------
- - - --------
                                                              2451
22490

SERVICEMASTER CO               COM              81760N109      392
20902 SH
SOLE    01              20902        0        0
                                                        ----------
- - - --------
                                                               392
20902

SIGMA ALDRICH CORP             COM              826552101      524
15220 SH
SOLE    01              15220        0        0
                                                               138
4000 SH
DEFINED 01               4000        0        0
                                                        ----------
- - - --------
                                                               662
19220

SILICON GRAPHICS INC           COM              827056102      188
11500 SH
SOLE    01              11500        0        0
                                                        ----------
- - - --------
                                                               188
11500

SIPEX CORP                     COM              829909100    33117
1615445 SH
SOLE    01            1572595        0    42850
                                                        ----------
- - - --------
                                                             33117
1615445

SKYTEL COMMUNICATIONS INC      COM              83087Q104     1153
55090 SH
SOLE    01              55090        0        0
                                                        ----------
- - - --------
                                                              1153
55090

SMITHKLINE BEECHAM PLC         ADR REP ORD      832378301     3231
48916 SH
SOLE    01              48916        0        0
                                                                37
556 SH
DEFINED 01                556        0        0
                                                        ----------
- - - --------
                                                              3268
49472

SONY CORP                      ADR NEW          835699307      221
2000 SH
DEFINED 01               2000        0        0
                                                        ----------
- - - --------
                                                               221
2000











                                                          FORM 13F
PAGE    29 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

SOUTHERN CO                    COM              842587107      356
13430 SH
SOLE    01              13430        0        0
                                                                21
800 SH
DEFINED 01                800        0        0
                                                        ----------
- - - --------
                                                               377
14230

SPEEDFAM INTERNATIONAL         COM              847705100     1027
99720 SH
DEFINED 01              99720        0        0
                                                        ----------
- - - --------
                                                              1027
99720

SPRINT CORP                    COM FON GROUP    852061100      493
9300 SH
SOLE    01               7700        0     1600
                                                               297
5600 SH
DEFINED 01               5600        0        0
                                                        ----------
- - - --------
                                                               790
14900

SPRINT CORP                    PCS COM SER 1    852061506      118
2075 SH
SOLE    01               1675        0      400
                                                                88
1550 SH
DEFINED 01               1550        0        0
                                                        ----------
- - - --------
                                                               207
3625

STAPLES INC                    COM              855030102     1858
60042 SH
SOLE    01              60042        0        0
                                                        ----------
- - - --------
                                                              1858
60042

STARBUCKS CORP                 COM              855244109    29200
777387 SH
SOLE    01             755887        0    21500
                                                        ----------
- - - --------
                                                             29200
777387

STATE STR CORP                 COM              857477103     1588
18597 SH
SOLE    01              14997        0     3600
                                                        ----------
- - - --------
                                                              1588
18597

STERLING COMM INC              COM              859205106      478
13000 SH
SOLE    01              13000        0        0
                                                        ----------
- - - --------
                                                               478
13000

STONERIDGE INC                 COM              86183P102      591
34771 SH
OTHER   01                  0        0    34771
                                                        ----------
- - - --------
                                                               591
34771

SUN MICROSYSTEMS INC           COM              866810104     1223
17760 SH
SOLE    01              17670        0       90
                                                               207
3000 SH
DEFINED 01               3000        0        0
                                                        ----------
- - - --------
                                                              1430
20760

SUNRISE ASSISTED LIVING INC    COM              86768K106    35957
1031030 SH
SOLE    01            1002480        0    28550
                                                        ----------
- - - --------
                                                             35957
1031030

SUNTRUST BKS INC               COM              867914103      803
11561 SH
SOLE    01               7561        0     4000
                                                               187
2700 SH
DEFINED 01               2700        0        0
                                                        ----------
- - - --------
                                                               990
14261










                                                          FORM 13F
PAGE    30 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

SUPERVALU INC                  COM              868536103     1087
41991 SH
SOLE    01              41991        0        0
                                                        ----------
- - - --------
                                                              1087
41991

SYLVAN LEARNING SYS INC        COM              871399101    47412
1743924 SH
SOLE    01            1697724        0    46200
                                                               218
8025 SH
DEFINED 01                  0        0     8025
                                                        ----------
- - - --------
                                                             47630
1751949

SYNOPSYS INC                   COM              871607107    44930
814144 SH
SOLE    01             792144        0    22000
                                                        ----------
- - - --------
                                                             44930
814144

SYSCO CORP                     COM              871829107      480
16110 SH
SOLE    01              16110        0        0
                                                                83
2800 SH
DEFINED 01               2800        0        0
                                                        ----------
- - - --------
                                                               564
18910

TJX COS INC NEW                COM              872540109      213
6400 SH
SOLE    01               6400        0        0
                                                        ----------
- - - --------
                                                               213
6400

TELEFLEX INC                   COM              879369106      430
9900 SH
SOLE    01               9900        0        0
                                                        ----------
- - - --------
                                                               430
9900

TELEPHONE & DATA SYS INC       COM              879433100      580
7932 SH
SOLE    01               7932        0        0
                                                        ----------
- - - --------
                                                               580
7932

TELETECH HOLDINGS INC          COM              879939106      405
40000 SH
SOLE    01              40000        0        0
                                                        ----------
- - - --------
                                                               405
40000

TETRA TECH INC                 COM              88162G103    32015
1918428 SH
SOLE    01             441679        0  1476748
                                                        ----------
- - - --------
                                                             32015
1918428

TEXACO INC                     COM              881694103     1101
17645 SH
SOLE    01              17245        0      400
                                                               370
5926 SH
DEFINED 01               5926        0        0
                                                        ----------
- - - --------
                                                              1470
23571

TEXAS INSTRS INC               COM              882508104    15716
109140 SH
SOLE    01             101365        0     7775
                                                              1957
13590 SH
DEFINED 01              13590        0        0
                                                        ----------
- - - --------
                                                             17673
122730











                                                          FORM 13F
PAGE    31 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

TIME WARNER INC                COM              887315109      202
2780 SH
SOLE    01               2780        0        0
                                                        ----------
- - - --------
                                                               202
2780

TOP SOURCE TECHNOLOGIES INC    COM              890530108       93
87700 SH
SOLE    01              87700        0        0
                                                        ----------
- - - --------
                                                                93
87700

TRANSACTION SYS ARCHITECTS     CL A             893416107      285
7300 SH
SOLE    01               7300        0        0
                                                        ----------
- - - --------
                                                               285
7300

TREX INC                       COM              89531P105     6518
256870 SH
SOLE    01             249720        0     7150
                                                        ----------
- - - --------
                                                              6518
256870

TRIBUNE CO NEW                 COM              896047107      558
6400 SH
DEFINED 01               6400        0        0
                                                        ----------
- - - --------
                                                               558
6400

TYCO INTL LTD NEW              COM              902124106    17960
189548 SH
SOLE    01             172070        0    17478
                                                              2180
23005 SH
DEFINED 01              23005        0        0
                                                        ----------
- - - --------
                                                             20139
212553

UNILEVER N V                   N Y SHS NEW      904784709       59
847 SH
SOLE    01                847        0        0
                                                               778
11159 SH
DEFINED 01              11159        0        0
                                                        ----------
- - - --------
                                                               837
12006

UNION PAC CORP                 COM              907818108      419
7180 SH
SOLE    01               7180        0        0
                                                               254
4350 SH
DEFINED 01               4350        0        0
                                                        ----------
- - - --------
                                                               672
11530

UNITED TECHNOLOGIES CORP       COM              913017109      148
2050 SH
SOLE    01               2050        0        0
                                                               547
7600 SH
DEFINED 01               7600        0        0
                                                        ----------
- - - --------
                                                               695
9650

VEECO INSTRS INC DEL           COM              922417100      292
8600 SH
SOLE    01               8600        0        0
                                                        ----------
- - - --------
                                                               292
8600











                                                          FORM 13F
PAGE    32 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

VICOR CORP                     COM              925815102     2082
98250 SH
SOLE    01              98250        0        0
                                                               178
8400 SH
DEFINED 01                  0        0     8400
                                                        ----------
- - - --------
                                                              2260
106650

VITESSE SEMICONDUCTOR CORP     COM              928497106     2556
37900 SH
SOLE    01              37900        0        0
                                                        ----------
- - - --------
                                                              2556
37900

VODAFONE GROUP PLC             SPONSORED ADR    92857T107     1449
7354 SH
SOLE    01               6804        0      550
                                                               327
1658 SH
DEFINED 01               1658        0        0
                                                        ----------
- - - --------
                                                              1775
9012

WACHOVIA CORP                  COM              929771103      821
9600 SH
SOLE    01               9600        0        0
                                                               150
1756 SH
DEFINED 01               1756        0        0
                                                        ----------
- - - --------
                                                               972
11356

WAL MART STORES INC            COM              931142103     4459
92408 SH
SOLE    01              92408        0        0
                                                               786
16300 SH
DEFINED 01              16300        0        0
                                                        ----------
- - - --------
                                                              5245
108708

WARNER LAMBERT CO              COM              934488107    11204
162080 SH
SOLE    01             158530        0     3550
                                                              3673
53137 SH
DEFINED 01              53137        0        0
                                                        ----------
- - - --------
                                                             14877
215217

WASHINGTON POST CO             CL B             939640108      108
200 SH
SOLE    01                200        0        0
                                                               108
200 SH
DEFINED 01                200        0        0
                                                        ----------
- - - --------
                                                               215
400

WASTE MGMT INC DEL             COM              94106L109      539
10021 SH
SOLE    01              10021        0        0
                                                        ----------
- - - --------
                                                               539
10021

WELLPOINT HEALTH NETWORK NEW   COM              94973H108      280
3300 SH
SOLE    01               3300        0        0
                                                        ----------
- - - --------
                                                               280
3300

WELLS FARGO & CO NEW           COM              949746101    13086
306102 SH
SOLE    01             284122      300    21680
                                                              2793
65330 SH
DEFINED 01              65330        0        0
                                                        ----------
- - - --------
                                                             15879
371432








                                                          FORM 13F
PAGE    33 OF    33                  NAME OF REPORTING
MANAGER:BROWN INVESTMENT
ADVISORY & TRUST CO                  AS OF 09/30/99
                                                           VALUE
SHARES/  SH/
PUT/ INVSTMT    OTHER          VOTING AUTHORITY
        NAME OF ISSUER         TITLE OF CLASS     CUSIP   (X$1000)
PRN AMT  PRN
CALL DSCRETN   MANAGERS     SOLE    SHARED    NONE
- - - ------------------------------ ---------------- --------- --------
- - - -------- ---
- - - ---- ------- ------------ -------- -------- --------

WESTVACO CORP                  COM              961548104      197
6777 SH
SOLE    01               6777        0        0
                                                                52
1800 SH
DEFINED 01               1800        0        0
                                                        ----------
- - - --------
                                                               249
8577

WHITE MTNS INS GROUP INC       COM              964126106      226
1600 SH
SOLE    01               1600        0        0
                                                        ----------
- - - --------
                                                               226
1600

WHOLE FOODS MKT INC            COM              966837106      344
7150 SH
SOLE    01               7150        0        0
                                                        ----------
- - - --------
                                                               344
7150

WILLIAMS COS INC DEL           COM              969457100      272
6400 SH
SOLE    01               6400        0        0
                                                        ----------
- - - --------
                                                               272
6400

WILMAR INDS INC                COM              971426101    16642
1280156 SH
SOLE    01            1244556        0    35600
                                                        ----------
- - - --------
                                                             16642
1280156

XEIKON N V                     SPONSORED ADR    984003103      374
16450 SH
SOLE    01              16450        0        0
                                                        ----------
- - - --------
                                                               374
16450

XEROX CORP                     COM              984121103      969
16406 SH
SOLE    01              16406        0        0
                                                               112
1900 SH
DEFINED 01               1900        0        0
                                                        ----------
- - - --------
                                                              1081
18306

ZEMEX CDA CORP                 COM              988910105      341
53959 SH
SOLE    01              53959        0        0
                                                        ----------
- - - --------
                                                               341
53959


                  GRAND TOTAL                              2353932
TOTAL
ENTRIES            522





















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