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Dr. Thesing is a physician, zoologist and scientific writer of repute in Germany, author of numerous biologic works of both general and technical character. He has been director of the scientific division of the great publishing house of Teubner in Leipzig and a co-founder of the widely known periodical Die naturwissenschaften. These qualifications peculiarly fit him to write the present work, which is a panorama of the development and diversifications of the reproductive function in the animal world. It is not a systematic unfolding of the successive stages of evolution traced up the ladder of life from ameba to man but rather the story of the many interesting and curious developments of sexual processes and mating behavior that have been evolved in various groups of animals from the lowest to the highest and from the simple to the complex. Some of these widely divergent and curious accomplishments of the sexual
Genealogy of Sex: Sex in Its Myriad Forms, From the One-Celled Animal to the Human Being. JAMA. 1934;103(15):1176-1177. doi:10.1001/jama.1934.02750410066029