In 65 chemical and pharmaceutical laboratories women comprised 22 percent of the professional personnel. The majority were in jobs requiring only B.S. degrees and in laboratories emphasizing long-range research. The overall turnover rate for women was much higher than for men, but within the upper grades the rate was only moderately higher, and within the lowest grade was no higher. Laboratory directors reported that turnover differentials did not inhibit the employment of women, provided they could be expected to remain for a certain minimum time.