MAN AND APES, 167 



(18) that of the liver; (19) that of the 

 vermiform appendix ; (20) the succession of 

 the teeth; (21) the absence of laryngeal 

 sacs ; (22) the quality of the voice. 



All the Gibbons differ from man, more 

 than do any other of the broad-breastboned 

 apes, in that (1) the length of the arms com- 

 pared with that of the spine is so great ; 

 (2) in the excessive length of the leg and 

 foot (taken together) compared with that of 

 the spine ; (3) in the length of the foot 

 compared with that of the hand ; (4) in the 

 structure of the tongue underneath ; (5) in 

 the form of the upper grinding teeth; (6) in 

 the smaller size of the body, and, in the 

 Siamang, in the uncovered cerebellum. 



We have seen also that some or other of 

 the Baboons — the lowest of the Simiadce — 

 excel all the higher apes in resemblance to 

 man as to certain points. These are: — (1) 

 The sigmoid^ curvature of the spine ; (2) the 

 lumbo-sacral angle; (3) the concavity of the 

 visceral surface of the sacrum; (4) the con- 



