So 



THE DOCTRINE OF IMMORTALITY 



of the dog-fish there hes at either side in the neighborhood of 

 the developing intestinal canal a group of cells, Fig. 23, germ 



Chrysemys 



_Noto. 



LaLNe 



Fig. 24. 



cells, which resemble one another closely, and which may be 

 easily distinguished from the other cells of the body. They 



