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This large and rather closely printed volume represents a "stock-taking" of the work done under the stimulus of the Bureau of Social Hygiene with the administrative guidance of the Division of Medical Sciences, of the National Research Council, and covers the accomplishments since November, 1921.
The work is a compilation contributed to by twenty-three well known and competent men in the fields of physiology, biology, medicine and endocrinology. A complete review of so exhaustive a volume is obviously impossible. Its chapters deal with general biologic and hereditary considerations; the interrelations of genetic and endocrine sex factors; the embryologic development of sex factors; sex deviations, inversions and parabiosis; the physiology of sex; the biology, physiology and chemistry of the sex glands and their secretions; an excellent résumé of the research on plumage tests in birds; the physiology of insemination and fertilization; the effect of other endocrine secretions on the gonads and