The way was even opened for such a view as that of Freud and most of the psychoanalysts today who regard a strain of homosexuality as normal and almost constant, with a profound significance for the psychonervous life.

In 1891 Dr.Albert Moll, of Berlin, published his work, _Die Kontraere Sexualempfindung_, which subsequently appeared in much enlarged and revised editions.

It speedily superseded all previous books as a complete statement and judicious discussion of sexual inversion.

Moll was not content merely to present fresh clinical material.
He attacked the problem which had now become of primary importance: the nature and causes of sexual inversion.

He discussed the phenomena as a psychologist even more than as a physician, bearing in mind the broader aspects of the problem, keenly critical of accepted opinions, but judiciously cautious in the statement of conclusions.