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The introductory portion, which is about half of the book, consists of a presentation of the laws of heredity as determined by genetics, explaining both the mendelian theory of inheritance and the inheritance of characteristics governed by the x-chromosome. Professor Jennings points out that behaviorists and eugenicists are equally in error; that heredity and environment both are needed to explain the mutations to which species are subject. His speculations as to the method, the desirability and the results of controlled inheritances in controlled environments, and other effects on the individual and on society, are amazingly interesting.
The Biological Basis of Human Nature.. JAMA. 1930;95(26):1992. doi:10.1001/jama.1930.02720260038030