The exhibition of male genitals by an adult is a startling and embarrassing exhibit to the observer and a dangerous procedure on the part of the exhibitionist as it may lead to disgrace, arrest and imprisonment It constitutes about one-third of all sex crimes. Dr. Rickles presents the

known scientific facts about this psychosexual reaction and reveals the psychiatric factors that have been discovered during the past years. It is an excellent organization of the existing knowledge on the subject for the benefit of the medical profession, for whom it was written specifically. Here one may find the prevailing points of view in the psychological explanations of the exhibitionistic acts, and what can be done by way of therapeutic modification.