On the hundredth anniversary of Louis Pasteur's death, Gerald Geison has written a controversial biography that finally penetrates the secrecy that has surrounded much of this legendary scientist's laboratory work. Geison uses Pasteur's laboratory notebooks, made available only recently, and his published papers to present a rich and full account of some of the most famous episodes in the history of science and their darker sides - for example, Pasteur's rush to develop the rabies vaccine and the human risks his haste entailed. The discrepancies between the public record and the "private science" of Louis Pasteur tell us as much about the man as they do about the highly competitive and political world he learned to master. Through his vivid reconstruction of the professional rivalries as well as the national adulation that surrounded Pasteur, Geison places him in his wider cultural context. In giving Pasteur the close scrutiny his fame and achievements deserve, Geison's book offers compelling reading for anyone interested in the social and ethical dimensions of science.