Biology textbooks and books on the history of science generally give a limited picture of the roles women have played in the growth and development of the biological sciences, mentioning primarily the Nobel laureates. This book provides a definitive archival collection of essays on a larger group of women, profiling both their work and their lives. The volume includes 65 representative women from different countries and eras, and from as many branches of biological investigation as possible. In addition to biographical information and an evaluation of the woman's career and significance, each entry provides a full bibliographic listing of works by and about the subject. The volume includes entries on women who have gained recognition through attainment of advanced degrees despite familial and societal pressures, innovative research results, influence exerted in teaching and guidance of students, active participation and leadership in professional societies, extensive scholarly publication, participation on journal editorial boards, extensive field experience, and influence on public and political scientific policymaking. A woman was considered eligible for inclusion if she met several of these criteria. Providing a historical perspective, the book is limited to women who were born before 1930 or are deceased.