LYNDA BIRKE a biologist at the Centre for the Study of Women and Gender at the University of Warwick, is the author of Women, Feminism and Biology: The Feminist Challenge and Feminism, Animals and Science: The Naming of the Shrew. RUTH HUBBARD is Professor Emerita of Biology at Harvard University. Her most recent books are The Politics of Women's Biology, Exploding the Gene Myth (co-authored with Elijah Wald) and Profitable Promises: Essays on Women, Science and Health.