Biology, of all the natural sciences, is most closely linked to human activity and growth. In his discussion of eugenics and evolution, Garrett Hardin, a distinguished biologist, shows himself committed to the welding of this link. Reviewing the lives and theories of prominent biologists--Darwin, Mendel, Haldane, Muller--he not only clearly expounds their scientific premises, but goes far in examining their philosophical and sociological ramifications in today's world and the world of the future. Raising many pertinent but controversial questions, Dr. Hardin investigates the advantages and dangers of a eugenically planned society, questions the valor of mutations evolved through extraneous forces such as radiation. He concludes that change based on spontaneous mutation and natural selection result in species of a qualitatively different nature, the whole effect of his argument tending to subdue the eager experimenter who- staring into a microscope- believes that he has ""the whole world in his hands."" A final plea for subsidization of pure scientific research once more shows the author to be a man profoundly cognizant of the social and psychological climate of his time. A book not restricted to scientists, Nature and Man's Fate should appeal to the informed reader who is willing to pause and ponder.