114 MAN AND THE LOWER ANIMALS. n 



pm, premolars; m, molars. A line is drawn through the 

 first molar of Man, Gorilla, Cynocephalus, and Cebus, 

 and the grinding surface of the second molar is shown in 

 each, its anterior and internal angle being just above the 

 m of m\ 



more complex than in Man, and the proportional 

 size of the molars is different. The Gorilla has the 

 crown of the hindmost grinder of the lower jaw 

 more complex, and the order of eruption of the 

 permanent teeth is different; the permanent ca- 

 nines making their appearance before the second 

 and third molars in Man, and after them in the 

 Gorilla. 



Thus, while the teeth of the Gorilla closely 

 resemble those of Man in number, kind, and in 

 the general pattern of their crowns, they exhibit 

 marked differences from those of Man in secondary 

 respects, such as relative size, number of fangs, 

 and order of appearance. 



But, if the teeth of the Gorilla be compared 

 with those of an Ape, no further removed from it 

 than a Cynocephalus, or Baboon, it will be found 

 that differences and resemblances of the same 

 order are easily observable; but that many of the 

 points in which the Gorilla resembles Man are 

 those in which it differs from the Baboon; while 

 various respects in which it differs from Man are 

 exaggerated in the Cynoceplialus. The number 

 and the nature of the teeth remain the same in 

 the Baboon as in the Gorilla and in Man. But 

 the pattern of the Baboon's upper molars is quite 



