VERTEBRATA. 345 
The Orang is the least human of all the anthropoid 
Apes as regards the skeleton, but comes nearest to Man in 
the form of the brain. The Chimpanzee approaches Man 
most closely in the character of its cranium and teeth, and 
the proportional size of the arms. The Gorilla is most 
Fig. 346.—Skeletons of Man, Chimpanzee, and Orang. 
Man-like in bulk (sometimes reaching the height of five 
feet six inches), in the proportions of the leg to the body 
and of the foot to the hand, in the size of the heel, the 
form of the pelvis and shoulder- blade, and volume of 
brain.”” 
ce. Man differs from the Apes in being an erect biped. 
In him, the vertebrate type, which began in the horizontal 
Fish, finally became vertical. No other animal habitually 
stands erect; in no other are the fore-limbs used exclusive- 
ly for head-purposes, and the hind pair solely for locomo- 
tion. 
Man alone can stand, walk, run, jump, climb, swim, ride, 
drive, sit, or lie on his back for any length of time. 
His limbs are naturally parallel to the axis of his body, 
not perpendicular. They have a near equality of length, 
