8 



Development and Shape of Uriniferons Tubules 



Anatomists in 1003, accomjianicMl In- a demonstration of a poi'tion of the 

 models here figured. 



Material. 



In selecting the material to be used, it seemed to me desirable to in- 

 clude in this study developmental stages of both simple and lobulate 

 kidneys ; the embryos selected depended largely on the accessibility of the 

 material. The embryological material used in the investigation was as 

 follows : 



HUMAN EMBRYOS. 



