Clark's biography reveals the private life of J.B.S. Haldane - trail-blazing geneticist & physiologist, popularizer of science and dedicated Marxist. His relationships with colleagues & the political establishment were normally acrimonious - the reminiscences of friends & enemies, as well as his private papers, add the weight of personal insight to this examination of a great man.Acknowledgments1. TrainingLife with fatherThe enjoyable experience2. Testing timeThe mathematics of evolutionA geneticist in the headlines"The Prof" of U.C.3. Into battleReally facing the dictatorsA scientist goes to warA scientist fights the warLysenko: the inescapable choice"The cuddly cactus"4. The green fields beyondThe great decisionAiding IndiaA brief look at paradiseGood-bye to all thatBibliographyIndex