me we are not dealing with subjects
belonging to the lunatic asylum, or the prison. We are concerned with
individuals who live in freedom, some of them suffering intensely from
their abnormal organization, but otherwise ordinary members of society. In
a few cases we are concerned with individuals whose moral or artistic
ideals have widely influenced their fellows, who know nothing of the
peculiar organization which has largely molded those ideals.

I am indebted to several friends for notes, observations, and
correspondence on this subject, more especially to one, referred to as
"Z.," and to another as "Q.," who have obtained a considerable number of
reliable histories for me, and have also supplied many valuable notes; to
"Josiah Flynt" (whose articles on tramps in _Atlantic Monthly_ and
_Harper's Magazine_ have attracted wide attention) for an appendix on
homosexuality among tramps; to Drs. Kiernan, Lydston, and Talbot for
assistance at various points noted in the text; and to Dr. K., an American
woman physician, who kindly assisted me in obtaining cases, and has also
supplied an appendix. Other obligations are mentioned in the text.

All those portions of the book which are of medical or medico-legal
interest, including most of the cases, have appeared during the last three
years in the _Alienist and Neurologist_, the _Journal of Mental Science_,
the _Centralblatt fuer Nervenheilkunde_, the _Medico-legal Journal_, and
the _Archivo delle Psicopatie Sessuale_. The cases, as they appear in the
present volume, have been slightly condensed, but nothing of genuine
psychological interest has been omitted. Owing to some delay in the
publication of the English edition of the work, a German translation by my
friend, Dr. Hans Kurella, editor of the _Centralblatt fuer
Nervenheilkunde_, has already appeared (1896) in the _Bibliothek fuer
Sozialwissenschaft_. The German edition contains some matter which has
finally been rejected from the English edition as of minor importance; on
the other hand, much has been added to the English edition, and the whole
carefully revised.

I have only to add that if it may seem that I have unduly ignored the
cases and arguments brought forward by other writers, it is by no means
because I wish to depreciate the valuable work done by my predecessors in
this field. It is solely because I have not desired to popularize the
results previously reached, but simply to bring forward my own results. If
I