specialist in nervous and mental disorders and as a contributor to
the psychological aspects of his specialty. The volume here presented
was issued in 1897; the translation is from the second and
enlarged edition of 1905. The volume may be accepted as an authoritative
exposition of a leader in his ``Fach,'' and is the more acceptable
for purposes of translation, in that the wide interests of the writer
and his sympathetic handling of his material impart an unusually
readable quality to his pages.
JOSEPH JASTROW.
MADISON, WISCONSIN,
DECEMBER, 1910.



AUTHOR'S PREFACE TO THE AMERICAN EDITION.


THE present work was the first really objective Criminal Psychology
which dealt with the mental states of judges, experts, jury, witnesses,
etc., as well as with the mental states of criminals. And a
study of the former is just as needful as a study of the latter. The
need has fortunately since been recognized and several studies of
special topics treated in this book--e. g. depositions of witnesses,
perception, the pathoformic lie, superstition, probability, sensory
illusions, inference, sexual differences, etc.--have become the
subjects of a considerable literature, referred to in our second edition.

I agreed with much pleasure to the proposition of the American
Institute of Criminal Law and Criminology to have the book translated.
I am proud of the opportunity to address Americans and