*Innateness.*--Only for the first and most extreme class of inverts, as can be imagined, has innateness been claimed, and this from their own assurance that at no time in their life has their sexual impulse followed a different course. The fact of the existence of two other classes, especially of the third, is difficult to reconcile with the assumption of its being congenital. Hence, the propensity of those holding this view to separate the group of absolute inverts from the others results in the abandonment of the general conception of inversion. Accordingly in a number of cases the inversion would be of a congenital character, while in others it might originate from other causes. In contradistinction to this conception is that which assumes inversion to be an _acquired_ character of the sexual impulse. It is based on the following facts. (1) In many inverts (even absolute ones) an early affective sexual impression can be demonstrated, as a result of which the homosexual inclination developed. (2) In many others outer influences of a promoting and inhibiting nature can be demonstrated, which in earlier or later life led to a fixation of the inversion--among which are exclusive relations with the same sex, companionship in war, detention in prison, dangers of hetero-sexual intercourse, celibacy, sexual weakness, etc. (3) Hypnotic suggestion may remove the inversion, which would be surprising in that of a congenital character. In view of all this, the existence of congenital inversion can certainly be questioned. The objection may be made to it that a more accurate examination of those claimed to be congenitally inverted will probably show that the direction of the libido was determined by a definite experience of early childhood, which has not been retained in the conscious memory of the person, but which can be brought back to memory by proper influences (Havelock Ellis). According to that author inversion can be designated only as a frequent variation of the sexual impulse which may be determined by a number of external circumstances of life. The apparent certainty thus reached is, however, overthrown by the retort that manifestly there are many persons who have experienced even in their early youth those very sexual influences, such as seduction, mutual onanism, without becoming inverts, or without constantly remaining so. Hence, one is forced to assume that the alternatives congenital and acquired are either incomplete or do not cover the circumstances present in inversions.