Adrenal Cortex

such factors in social evolution, but uncritical assertions, especially by so eminent a geneticist, serve only to confuse the issue. One aim of the authors, as expressed in the preface, is to "introduce the concepts and methods of genetics to the general student." Though the professional geneticist will find, as always in the work of Darlington and Mather, much food for thought, the general student will do well to read with caution.