G. Carl Huber 



79 



tiibiile it is evident that the somewhat atypical form assumed is due to 

 the fact that its juxtaposition to other and slightly larger tubules is 

 such that for purely mechanical reasons, on growing and elongating 

 presumably in the direction of least resistance, its coiled portion was 



Fig. 19. Tubule A. from kidney cf rabbit embryo (No. 13) measuring 6 5 

 cm. X 80. Tubule B, from kidney of rabbit one day old (No. 14). x 40. 



