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THE SCIENCE OF LIFE. 



prehensile, and is often quite rudimentary. The canine 

 teeth are large. (Fig. 171.) The arms are long; in the 

 Chimpanzee reaching to the middle of the tibia, when 

 hanging down. 



FIG. 171. A. Slcull of the Orang-outang. B. Skull of an ndult European. 



Order 13. Biwana, (two-handed,) contains but one 

 genus and one species: Homo, or Man. (Fig. 172.) 



Man differs from all animals in being an erect biped. 

 The vertebrate type, which in all other cases is horizontal, 

 in him is vertical. No other animal habitually stands 

 erect ; in no other are the fore-limbs used exclusively for 

 head purposes, and the hind pair solely for locomotion. 

 His limbs are parallel to the axis of his body, not per- 

 pendicular. They are nearly equal in length, but the 

 arms are always a little shorter than the legs. In the 

 Apes the arms reach below the knee. 



Man only has a finished hand, which is a perfect organ 

 of touch, and most versatile in movement. The foot is 

 planted upon the ground by the entire length of the sole. 

 The Gorilla has an inferior hand and an inferior foot. 



