Inverted sexuality, the sexual instinct diverted from its normal channel, directed (in the case of males) to males, forms the topic of the following discourse. The study will be confined to modern times, and to those nations which regard the phenomenon with religious detestation. This renders the enquiry peculiarly difficult, and exposes the enquirer, unless he be a professed expert in diseases of the mind and nervous centres, to almost certain misconstruction. Still, there is no valid reason why the task of statement and analysis should not be undertaken. Indeed, one might rather wonder why candid and curious observers of humanity have not attempted to fathom a problem which faces them at every turn in their historical researches and in daily life. Doubtless their neglect is due to natural or acquired repugnance, to feelings of disgust and hatred, derived from immemorial tradition, and destructive of the sympathies which animate a really zealous pioneer. Nevertheless, what is human is alien to no human being. What the law punishes, but what, in spite of law, persists and energises, ought to arrest attention. We are all of us responsible to some extent for the maintenance and enforcement of our laws. We are all of us, as evolutionary science surely teaches, interested in the facts of anthropology, however repellant some of these may be to our own feelings. We cannot evade the conditions of _atavism_ and _heredity_. Every family runs the risk of producing a boy or a girl whose life will be embittered by inverted sexuality, but who in all other respects will be no worse or better than the normal members of the home. Surely, then, it is our duty and our interest to learn what we can about its nature, and to arrive through comprehension at some rational method of dealing with it. I. CHRISTIAN OPINION. Since this enquiry is limited to actual conditions of contemporary life, we need not discuss the various ways in which the phenomenon of sexual inversion has been practically treated by races with whose habits and religions we have no affinity. On the other hand, it is of the highest importance to obtain a correct conception of the steps whereby the Christian nations, separating themselves from ancient paganism, introduced a new and stringent morality into their opinion on this topic, and enforced their ethical views by legal prohibitions of a very formidable kind.