The way was thus made clear for the rapid progress of our knowledge of this abnormality.

New cases were published in quick succession, at first exclusively in Germany, and more especially in Westphal's _Archiv_, but soon in other countries also, chiefly Italy and France.[113] While Westphal was the first to place the study of sexual inversion on a progressive footing, many persons had previously obtained glimpses into the subject.

Thus, in 1791, two cases were published[114] of men who showed a typical emotional attraction to their own sex, though it was not quite clearly made out that the inversion was congenital.

In 1836, again, a Swiss writer, Heinrich Hoessli, published a rather diffuse but remarkable work, entitled _Eros_, which contained much material of a literary character bearing on this matter.

He seems to have been moved to write this book by a trial which had excited considerable attention at that time.