
<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
Bioanalytical  Systems, Inc. consolidated  financial statements contained in the
company's  annual  report  on Form  10-Q and is  qualified  in its  entirety  by
reference to such financial statements.
</LEGEND>
<MULTIPLIER>   1000

<S>                                            <C>                    <C>
<PERIOD-TYPE>                                        3-MOS                  9-MOS
<FISCAL-YEAR-END>                              SEP-30-1999            SEP-30-1999
<PERIOD-START>                                 APR-01-1999            OCT-01-1999
<PERIOD-END>                                   JUN-30-1999            JUN-30-1999
<CASH>                                               1,860                  1,860
<SECURITIES>                                             0                      0
<RECEIVABLES>                                        2,814                  2,814
<ALLOWANCES>                                             0                      0
<INVENTORY>                                          2,010                  2,010
<CURRENT-ASSETS>                                     6,945                  6,945
<PP&E>                                              21,389                 21,389
<DEPRECIATION>                                       4,757                  4,757
<TOTAL-ASSETS>                                      24,854                 24,854
<CURRENT-LIABILITIES>                                2,209                  2,209
<BONDS>                                                  0                      0
<PREFERRED-MANDATORY>                                    0                      0
<PREFERRED>                                              0                      0
<COMMON>                                               999                    999
<OTHER-SE>                                          16,134                 16,134
<TOTAL-LIABILITY-AND-EQUITY>                        24,854                 24,854
<SALES>                                              2,412                  7,036
<TOTAL-REVENUES>                                     4,973                 14,628
<CGS>                                                  901                  2,724
<TOTAL-COSTS>                                        2,696                  7,718
<OTHER-EXPENSES>                                     2,149                  6,424
<LOSS-PROVISION>                                         0                      0
<INTEREST-EXPENSE>                                      47                    112
<INCOME-PRETAX>                                         92                    436
<INCOME-TAX>                                            25                    175
<INCOME-CONTINUING>                                     67                    261
<DISCONTINUED>                                           0                      0
<EXTRAORDINARY>                                          0                      0
<CHANGES>                                                0                      0
<NET-INCOME>                                            67                    261
<EPS-BASIC>                                          .01                    .06
<EPS-DILUTED>                                          .01                    .06



</TABLE>
