160 MAN AND APES. 



should be so favourable in the life-struggle as 

 to be independently developed in different 

 forms by any mere action of natural selection. 



Nevertheless, when we pass to the American 

 apes we find it reappearing in the Spider and 

 Howling Monkeys, and, strange to say, even 

 amongst the Half-apes (e.g. 9 in Arctocebus, 

 Mierocebus, and Galago) the same structure 

 is distinctly developed. 



4. The fourth character is one drawn from 

 the order of the succession of the teeth. Each 

 eye-tooth of the second or permanent set is 

 cut in man before the hindmost grinder but 

 one makes its appearance. In the Orang, 

 Chimpanzee, and Gorilla all the grinders of 

 the second set make their appearance before 

 the canines of the same set. In the Gibbons, 

 the canines accompany, if they do not precede, 

 the appearance of the hindmost grinder, and 

 so far, therefore, these animals seem to ap- 

 proximate to the human condition ; but the 

 resemblance is of no significance, since it is 

 a condition often found in the lower apes. 



