This is a fairly complete work on psychological development. The author spent much time in producing this book; he gives a clear

picture of mental growth from its beginning, in both the animal and human organisms.

The writer has organized the facts of modern genetics and gives a summary of early development of infant behavior. With this biological foundation he gives experimental findings related to the understanding of alterations in adaptive behavior in highly developed animals and growing humans.

In chapter fifteen the author discusses the psychoanalytical theories about behavior and personality development but shows that he has very little knowledge of psychoanalysis, to which he is strongly opposed. The writer's strong resistance to psychoanalysis must be the reason why he omitted Professor Freud from his thirty-six page bibliography.