iv CONTENTS 



J. S. Ferguson. The application of the .silver impregnation method of Biel- 

 schow.sky to reticular and other connective tissues. I. The mature tis- 

 sues. 'IMiirteen figures 277 



R. R. Hknsley. Studies on the pancreas of the guinea pig. Fifteen figures . 297 



Fredeuic T. Lewis. The bi-lobed form of the ventral pancreas in mammals. 



Twelve figures. '■^^^ 



No. 4 JANUARY, 1912 



John H. Stokes. The acoustic complex and its relations in the brain of the 



opossum (Didelphys Virginiana). Fourteen figures 401 



Charles F. Silvester. On the presence of permanent communication 

 between the lymphatic and the venous systems at the level of the renal 

 veins in adult South American monkeys. Twelve figures 447 



A. M. M'LLEr. The development of the jugular lymph sac in birds. Ten 



figures 473 



Frank Reagan. The fifth aortic arch of mammalian embryos; the nature of 



the last pharyngeal evagination. Sixteen figures 493 



