"Amassing information from biology, chemistry, paleontology, cybernetics, and psychology, [Adler] has contrived a dazzling exercise in scholarship and logic."-The New York Times Book Review

This book was first published in 1967. It dealt with what I recognized to be a mixed question that could not be satisfactorily answered by philosophical thought alone, or by the empirical sciences. Philosophy posed the question about the specific nature of man and the place of Homo sapiens in the order of nature. Do human beings differ from the higher mammals only in degree or in kind; and if in kind, is the difference radical or only superficial?