DEPARTMENT OF EMBRYOLOGY. Ill 



S. Miller, of Madison. Professor George B. Jenkins, of Louisville, 

 has used the collection in a study of the development of the olive, and 

 Professor Kingsbury, of Ithaca, in a study on the development of the 

 human pharynx. Dr. Oswald S. Lowsley employed a few of our 

 specimens in the preparation of his paper on the prostate gland in old 

 age, and lastly Professor Thomas S. Cullen has based almost entirely 

 upon our embryos his study of the development of the umbilical region, 

 which is given in the first chapter of his treatise on this subject pub- 

 hshed recently. 



Biometric studies on the human embryo by Dr. Michael Reicher, to 

 which reference was made in Year Books Nos. 12 and 13, were inter- 

 rupted on account of the European war. It is planned to continue 

 this work in the near future, as our specimens are increasing rapidly in 

 number and it is desirable to obtain a satisfactory antenatal curve of 

 growth. Through cooperation with the obstetrical department of the 

 Johns Hopkins Hospital two studies upon this subject have been pre- 

 pared by Professor A. W. Meyer, of Leland Stanford Junior University, 

 one on the curves of prenatal growth and autocatalysis, and the other 

 on fields, graphs, and other data of fetal growth. These have been 

 published as Contributions to Embryology, No. 4 (Publication No. 222) 

 by the Carnegie Institution of Washington. 



In this connection I may mention my own publication on the age of 

 embryos and the duration of pregnancy; also my paper on anatomical 

 characters of the human brain, which are believed to vary according 

 to race and sex. The latter forms one of the essays in a collection of 

 papers of especial use in the study of Afro-American problems. It 

 should be extended to include the fetal brain. In order to gather more 

 material a circular entitled "On the study of racial embryology" 

 was widely distributed in Asia and in British North America ; and the 

 result of this effort has been the addition of a number of valuable speci- 

 mens of the embryos of different races. Studies of this kind call for 

 the cooperation of many individuals as well as for joint investigations 

 by the embryologist and the physical anthropologist. To develop this 

 plan I have repeatedly sought the advice of Professor vSchlaginhaufen, 

 who has been most generous in giving it. I also want to add that 

 many missionaries and physicians in foreign countries have shown the 

 greatest willingness in sending specimens for our collection. 



The fifth contribution to the study of the pathology of human 

 embryos (by myself) appears in Publication No. 224 of the Carnegie 

 Institution of Washington. It is entitled ''The human magma 

 reticule in normal and in pathological development." In this study 

 it is shown that fibrils f oniiing the reticular magma are always in direct 

 continuity with those of the mesenchyme of the chorionic wall. This 

 fact can be easily demonstrated by means of the Van Gieson stain, and 

 reticular magma must therefore be viewed as embryonic connective 



