This indifference enables them to exploit the homosexual foreigners who are specially attracted to southern Italy in the development of a flourishing homosexual industry.
[103] It is true that in the solitude of great modern cities it is possible for small homosexual coteries to form, in a certain sense, an environment of their own, favorable to their abnormality; yet this fact hardly modifies the general statement made in the text.
[104] See especially Hirschfeld, _Die Homosexualitaet_, chs.

xxiv and xxv.
[105] Ulrichs, in his _Argonauticus_, in 1869, estimated the number as only 25,000, but admitted that this was probably a decided underestimate.
Bloch (_Die Prostitution_, Bd.

i, p.

792) has found reason to believe that in Cologne in the fifteenth century the percentage was nearly as high as Hirschfeld finds it today.

A few years earlier Bloch had believed (_Beitraege_, part i, p.