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Among the endless stream of books on sex that is pouring from the press here is one that stands out, both by reason of its subject matter and its scholarly treatment. Dr. Thesing has confined himself to a study of the sexual impulse in the myriad ways in which it manifests itself, from the protozoa up to man. This delimiting of the field enables him to present in considerable detail some aspects of the biology of sex which are seldom treated in textbooks or those designed for popular reading. He first deals with the “beginnings” of the sex act in the conjugation of one-celled organisms, and proceeds to the study of the reproductive cell. Numerous examples of sexual organization and methods of reproduction are given. A detailed discussion of hermaphroditic forms and their sexual activities follows, which brings together much interesting material not easily found elsewhere, at least by the casual student. A chapter entitled “The Emancipation of Women “is concerned, not with the female of the human species, but with the dominance of the female among lower animal forms. The spider, who eats her mate when coitus is over, even devouring him bit by bit while he is still endeavoring to fertilize her; the bee and many species of ants, who have succeeded in reducing the male to a mere fertilizing machine; and the numerous forms in which the male has been dispensed with altogether, reproduction taking place by parthenogenesis, are here discussed in a most interesting manner. “Lures and Stimuli” discusses the various devices which attract the sexes to each other, from the powerful olfactory stimuli of moths, which attract the male to the female over a distance of several miles, to the numerous artificial contrivances used by savages to enhance sexual pleasure. The fact that sexual love is an egoistic love, concerned primarily with the gratification of a natural impulse, and even in primitive man had nothing to do—so far as his conscious attitudes were concerned—with reproductio