G22 



ZOOLOGY . 



The orang-outang is 1-38 metres (4;^5 feet) high ; it has 

 twelve pairs of ribs, tlie same number as in man ; the arms 

 are very long, reaching the ground, so that in walking they 

 rest on their knuckles, swinging the body through their long 

 arms as if walking on crutches ; their posture is only ]}9.y- 

 tially erect. The forehead is less strongly marked than in 



Fig. 537. — The Cliimpanzee, variety Tshego. — From Brehin's Thierleben. 



the other apes, showing better the shape of the skull. The 

 volume of the brain, both of the orang and chimpanzee is 

 about twenty-six or twenty-seven cubic inches. The follow- 

 ing table will show, according to "Wyman, the relative 

 capacity of the skull in the different apes as comjjared with 

 man : 



