CHAPTER LXXXVIII 

 MAN AND HIS RELATIVES 



509. Man as organism. Any definition that we can make 

 of living things must apply to man. We have seen that growth 

 and development, irritability and contractility, in general char- 

 acteristic of the behavior of protoplasm, are also found to be 



FIG. 253. Limbs of primates 

 Hind and fore limbs (legs and arms) of man, gorilla, and lemur 



essentially the same in human beings. Like other living things 

 man depends upon food and water and oxygen and minerals for 

 his material existence and activities. Like them he is helped 

 as well as hindered by the things about him, by the living 

 things and by the non-living things. Like them he must at 

 every point adjust himself to his environment or be overcome 

 by it. Like them he reproduces his kind, 



490 



