Medico-juristic science made a considerable step when Casper adopted this distinction of two types of sexual inversion. But, as is always the case in the analysis of hitherto neglected phenomena, his classification falls far short of the necessities of the problem. While treating of acquired sexual inversion, he only thinks of debauchees. He does not seem to have considered a deeper question—deeper in its bearing upon the way in which society will have to deal with the whole problem—the question of how far these instincts are capable of being communicated by contagion to persons in their fullest exercise of sexual vigour. Taste, fashion, preference, as factors in the dissemination of anomalous passions, he has left out of his account. It is also, but this is a minor matter, singular that he should have restricted his observations on the freemasonry among pæderasts to those in whom the instinct is acquired. That exists quite as much or even more among those in whom it is congenital.
The upshot of the whole matter, however, is that the best book on medical jurisprudence now extant repudiates the enormities of Tardieu's method, and lays it down for proved that "the majority of persons who are subject" to sexual inversion come into the world, or issue from the cradle, with their inclination clearly marked.
