THE BIOLOGY OF POPULATION GROWTH, Raymond Pearl, Knopf ($3.50). Dr. Pearl, Director of the Institute of Biological Research at Johns Hopkins, long famous in scientific circles for his studies of how living things grow, has here produced a book which is intelligible to the layman yet includes enough scientific and mathematical data to be significant to scientists. He describes briefly experiments which show that a white rat, a pumpkin, the new tail of a tadpole (when the first tail is cut off), a colony of...
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