Transsexualism and Sex Reassignment

evaluates them, and relates them. He offers some new interpretations of old information and suggests some new directions for research. Over 500 references are offered, divided into a list of specific references to work cited in the text and a selected bibliography. The rigorous definitions of epidemiological terms that are given will be helpful to readers unfamiliar with their use. A few weaknesses need brief mention. In Chapter One the Figures depicting meiotic non-disjunction are unclear. They will not be needed by those who understand that process and they will probably only confuse those who do not. In Chapter Five, the recurrence risk to a mother carrying a D/G translocation is stated as 1/3. Recent studies, reported by Hamerton and others, indicate that the actual risk is lower than that, approximately 1/10. This book will not be of great interest to clinicians dealing only with the practical aspects of mongolism nor to students and house officers attempting to learn about the many facets of mongolism. It will, however, be very useful to researchers who are directing study into the causes of mongolism or of other chromosomal abnormalities. Geneticists will appreciate this collection of much of the data forming the basis for the figures used in predicting the occurrence and recurrence of mongolism.