There is another point which has become clearer of late. For as people are beginning to see that the sexes form in a certain sense a continuous group, so they are beginning to see that Love and Friendship--which have been so often set apart from each other as things distinct--are in reality closely related and shade imperceptibly into each other. Women are beginning to demand that Marriage shall mean Friendship as well as Passion; that a comrade-like Equality shall be included in the word Love; and it is recognised that from the one extreme of a ‘Platonic’ friendship (generally between persons of the same sex) up to the other extreme of passionate love (generally between persons of opposite sex) no hard and fast line can at any point be drawn effectively separating the different kinds of attachment. We know, in fact, of Friendships so romantic in sentiment that they verge into love; we know of Loves so intellectual and spiritual that they hardly dwell in the sphere of Passion. A moment’s thought will show that the general conceptions indicated above--if anywhere near the truth--point to an immense diversity of human temperament and character in matters relating to sex and love; but though such diversity has probably always existed, it has only in comparatively recent times become a subject of study. More than thirty years ago, however, an Austrian writer, K. H. Ulrichs, drew attention in a series of pamphlets (_Memnon_, _Ara Spei_, _Inclusa_, etc.) to the existence of a class of people who strongly illustrate the above remarks, and with whom specially this paper is concerned. He pointed out that there were people born in such a position--as it were on the dividing line between the sexes--that while belonging distinctly to one sex as far as their bodies are concerned they may be said to belong _mentally_ and _emotionally_ to the other; that there were men, for instance, who might be described as of feminine soul enclosed in a male body (_anima muliebris in corpore virili inclusa_), or in other cases, women whose definition would be just the reverse. And he maintained that this doubleness of nature was to a great extent proved by the special direction of their love-sentiment. For in such cases, as indeed might be expected, the (apparently) masculine person instead of forming a love-union with a female tended to contract romantic friendships with one of his own sex; while the apparently feminine would, instead of marrying in the usual way, devote herself to the love of another feminine.