IV CONTENTS 



No. 4. JANUARY, 1914 



E. V. CowDRY. The development of the cytoplasmic constituents of the 



nerve cells of the chick. Five plates 389 



J. F. GuDERNATSCH. Feeding experiments on tadpoles. II. A further contri- 

 bution to the knowledge of organs with internal secretion. Two double 

 plates 431 



Ch.\rles H. Swift. Origin and early history of the primordial germ-cells in 

 the chick. Fifteen figures 483 



