This book is a report on a systematic, quantitative study of the growth and structure of the body during the fetal period. The material is based on 35,000 determinations of 71 external dimensions of the body on a series of 400 selected human fetuses. Special studies were made to show also the effects of molding at birth and the artefacts produced by preservation in formaldehyde. One of the most important results of this work is the establishment of a new principle, that in general the linear growth of the various parts of the body is in uniform ratio during the fetal period. The wealth of original data and the critical discussion make this an indispensable work of reference to all who are concerned with the problems of growth. The book is well bound and well printed, and the paper is of excellent quality.