The human race, Mr. Bradley maintains in this book, consists of two main types—the long-heads, who came from Africa, and the short-heads, who came from Asia. Although absolutely pure representatives of these types are, he admits, rare, the long-heads are on the whole distinguished by a predominance of the feminine over the masculine aspects and of the unconscious over the conscious, while in the short-heads the predominance is of the opposite nature. The short-heads arose as a quasipathological variation, and there would appear to be a tendency to revert to the more assimilative long-headed type—a tendency which is hastened by a difficulty which the short-heads have in being born from mothers of the long-headed type. The conflict between the two types has sometimes crystallized in great wars, of which the recent world war was the