CONTENTS 



N0..I. JANUARY 



Raymond Pearl and Alice M. Boring. Sox studies. X. The corpus luteum in the 



ovary of the chicken. Six text figures and nine plates 1 



Eliot R. Clark. Studies on the growth of blood-vessels in the tail of the frog larva — 



by observation and experiment on the living animal. Sixteen figures 37 



J. A. Badektscher. The fate of the ultimobranchial bodies in the pig (Sus scrofa). 



Four plates 89 



J. DuESBERG. Chondriosomes in the testicle-cells of Fundulus. Twenty-one figures 



(two plates) 133 



.\dolf H. Schultz. The position of the insertion of the pectoralis major and deltoid 



muscles on the humerus of man. Three figures 155 



\V. B. Chapman. The effect of the heart-beat upon the development of the vascular 



system in the chick. Seventeen figures 175 



Edward A. Boyden. Vestigial gill filaments in chick embryos with a note on similar 



structures in reptiles. Three text figures and four plates 205 



No. 2. MARCH 



Alice Thing. The formation and structure of the zona pellucida in the ovarian eggs of 



turtles. Twelve figures 237 



Adolf H. Schultz. The fontanella metopica and its remnants in an adult skull. Five 



figures 259 



Franklin Paradise Johnson. The isolation, shape, size, and number of the lobules of 



the pig's liver. Twelve figures (two plates) 273 



Abram T. Kerr. The brachial plexus of nerves in man. The variations in its formation 



and branches. Twenty-nine figures 285 



Fr.\nklin p. Mall. On the age of Human Embryos. Two figures 397 



C. R. Bardeen. Determination of the size of the heart by means of the x-rays. One 

 figure 423 



