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Article
December 20, 1941

Fundamentals of Comparative Embryology of the Vertebrates

JAMA. 1941;117(25):2200. doi:10.1001/jama.1941.02820510088040

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Abstract

This is an elementary textbook devoted primarily to the development of the frog, the chick and the fetal membranes of mammals. Only one feature justifies so feeble an addition to the field: this is a series of excellent new stereograms of the frog's egg and the chick embryo. The attempt to make a corresponding series of early stages of human development failed because of the author's lack of familiarity with normal material: his diagrams (figs. 158-163) have many and serious errors. A consideration of experimental work is excluded for lack of space, but there is no excuse for the failure to use the many significant interpretations of normal processes which experimental embryology has given us. The book begins with a detailed discussion of genes, which enjoy greater popularity among zoologists today than ids and idants enjoyed a generation ago. On page 46 one reads "that the chromosomes are the cellular

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