This book deals almost entirely with 348 authentic cases of mongolian idiocy. Underlying the treatise is an apology to the mongolian race. The main contention is that mongolism is not a retroversion, but that it is a malformation in which the median skull defects overshadow the picture. The congenital defects can all be traced back to a narrow amniotic sac which produces the greatest damage from the sixth to the seventh week of embryonic development. The disturbances in the amnion occur due to a poor implantation of the ovum on a normal endometrium. The metabolic, the trophic and psychic disturbances as they occur after birth are due to a hypoplasia of the brain and poor development of the autonomic nervous system.
Much consideration is given to the views of other authors on the subject, and the treatise is most complete and is presented in an interesting manner. The portions on