See also Birnbaum, _Jahrbuch fuer sexuelle Zwischenstufen_, Bd.
viii, p.

611; he especially illustrates this kind of friendship by the correspondence of the poets Gleim and Jacobi, who used to each other the language of lovers, which, indeed, they constantly called themselves.
[77] This letter may be found in Ernst Schur's _Heinrich von Kleist in seinen Briefen_, p.295.

Dr.J.Sadger has written a pathographic and psychological study of Kleist, emphasizing the homosexual strain, in the _Grenzfragen des Nerven- und Seelenlebens_ series.
[78] Alexander's not less distinguished brother, Wilhelm von Humboldt, though not homosexual, possessed, a woman wrote to him, "the soul of a woman and the most tender feeling for womanliness I have ever found in your sex;" he himself admitted the feminine traits in his nature.

Spranger (_Wilhelm von Humboldt_, p.

288) says of him that "he had that dual sexuality without which the moral summits of humanity cannot be reached." [79] Krupp caused much scandal by his life at Capri, where he was constantly surrounded by the handsome youths of the place, mandolinists and street arabs, with whom he was on familiar terms, and on whom he lavished money.