In the three lectures which give their title to this delightful collection of esays, the author of "The Enchanted Voyage" and "The Itinerate Ivory Tower" turns his attention to the influence of the environment on the course of evolution. The first lecture considers the nature of the terrestrial biosphere, both as a unique phenomenon on earth and as one of a class of possible spaces on other bodies, the second examines the nature of the ecologi...
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