22 



ZOOLOGY 



The orang-outaug is 1-38 metres (4-4! feet) high ; it has 

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

 iire 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 par- 

 tially erect. The forehead is less strongly marked than iu 



Fig. 537". The Chimpanzee, variety Tshego. From Brohin'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 compared with 

 man : 



