The current volume of the Contributions to Embryology, which was unfortunately delayed in publication, contains a wealth of valuable material for students of reproduction and development. A. H. Schultz reports a study of growth and skeletal changes in more than a hundred chimpanzees from the late fetal to the mature stages. E. H. Boyden's painstaking analysis of a ten and twelve somite human embryo leads to valuable quantitative conclusions with regard to the relative volumes of different portions of the embryo at this time and to the enormous rapidity with which growth changes occur. Other interesting studies are those of Long on the in vitro growth of ovarian germinal epithelium, Fitzgerald on the bilaterally symmetrical defects of the cerebral cortex in a human infant, and Cuajunco on the development of neuromuscular spindles in human fetuses.
The monographs of Hines and Boynton and of Markee will undoubtedly become classic contributions to