CONTENTS 



No. 1. NOVEMBER, 1920 



S. Saguchi. Cytological studies of Langerhans's islets, with special reference to the 

 problem of ^ their relation to the pancreatic acinus tissue. Six plates (sixty-one 

 figures) and four text figures 1 



Hayato;Arai. On the cause of the hypertrophy of the surviving ovary after semispay- 



ingj(albino rat) and on the number of ova in it 59 



JosfilF. NoNiDEz. Studies on the gonads of the fowl. I. Hematopoietic processes in 

 the gonads of embryos and mature birds. Three plates (twenty-nine figures) 81 



No. 2. JANUARY, 1921 



Charles R. Stockard. Developmental rate and structural expression: An experi- 

 mental study of twins, 'double monsters' and single deformities, and the interac- 

 tion among embryonic organs during their origin and development. Thirty-two 

 text figures and six plates ' 115 



Geo. a. Thiel and Hal Downey. The development of the mammalian spleen, with 

 special reference to its hematopoietic activity. Three text figures and three plates 

 (eight figures) 279 



Chester H. Hetjser. The early establishment of the intestinal nutrition in the 

 opossum — The digestive system just before and soon after birth. Six plates 

 (twenty figures) 341 



John Lewis Bremer. Recurrent branches of the abducens nerve in human embryos. 

 Diagram A and four figures 371 



ToKUYASU Kudo. Studies on the effects of thirst. I. Effects of thirst on the weights 

 of the various organs and systems of adult albino rats 399 



No. 3. MARCH, 1921 



Warren H. Lewis. The effect of potassium permanganate on the mesenchyme cells 

 of tissue cultures. Sixteen figures (one plate) 431 



George A. Baitsell. A study of the development of connective tissue in the Am- 

 phibia. Six figures (four plates) 447 



\ (p(c. I ^ 



