Dr.Havelock Ellisof London is a lawyer as well as a trained medical scientific man. He is the author and compiler of many valuable works on medicolegal topics. His papers on criminality and his studies of sociologic questions have given him a wide reputation in both this country and in Europe, and he published in 1894 a remarkable work "On Man and Woman," which was a pioneer study on the psychologic and anthropologic differences of the sexes. This was followed in 1897 by the first volume of a series of works on the general study of the psychology of sex. This work was called "Sexual Inversion," and was confined to the physiology and psychology of the normal sex impulse. It was translated into German and published at Leipsic, and was read with great interest by jurists and criminal anthropologists. Soon afterward it appeared in London and was very highly