Many scientists' prophecies about man's future are dark and gloomy. Man is doomed, say the crepehangers, to overpopulate his planet and hang on, half-starved until something worse happens. British Biologist Julian Huxley is more hopeful. In his new book, Evolution in Action (Harper; $2.75) Huxley says that man is "not just an animal"; he is something new in evolution, and he has a boundless future.
Huxley tells how a particularly successful new species "deploys" over the earth, splitting into specialized branches. The reptiles deployed; then the mammals took over and...