92 MAX AXD THE LOWER ANIMALS. n 



circling zone, while in Man, the allantois remains 

 comparatively small, and its vascular rootlets are 

 eventually restricted to one disk-like spot. Hence, 

 while the placenta of the Dog is like a girdle, 

 that of Man has the cake-like form, indicated by 

 the name of the organ. 



But, exactly in those respects in which the 

 developing Man differs from the Dog, he resem- 

 bles the ape, which, like man, has a spheroidal 

 } T elk-sac and a discoidal, sometimes partially lobed, 

 placenta. So that it is only quite in the later 

 stages of development that the young human be- 

 ing presents marked differences from the young 

 ape, while the latter departs as much from the 

 dog in its development, as the man does. 



Startling as the last assertion may appear to 

 be, it is demonstrably true, and it alone appears 

 to me sufficient to place beyond all doubt the 

 structural unity of man with the rest of the ani- 

 mal world, and more particularly and closely with 

 the apes. 



Thus, identical in the physical processes by 

 which he originates — identical in the early stages 

 of his formation — identical in the mode of his 

 nutrition before and after birth, with the animals 

 which lie immediately below him in the scale — 

 Man, if his adult and perfect structure be com- 

 pared with theirs, exhibits, as might be expected, 

 a marvellous likeness of organization. He resem- 



