84 THE CA^sIXE TEETH. 



quently prove erroneous, is strikingly shown in these 

 observations on the use of the cuspidatus. The simple 

 and obvious use of this tooth, in the haman species, is 

 to tear such portions of food as are too hard or tough 

 to be divided by the incisors ; and we frequently find 

 it far more developed in animals which are known to 

 be exclusively frugivorous. Not only is its structure 

 wholly nnadapted for such an object as that assigned 

 to it in the text, but there is no analogous or other 

 ground for supposing that man was originally con- 

 structed for the pursuit and capture of living prey. 

 His naturally erect position and the structure of the 

 mouth would render this impossible by the means in- 

 ferred by Hunter; and the possession of so perfect an 

 instrument as the hand obviates the necessity of his 

 ever employing any other organ for the purpose of 

 seizing or holding food of whatever description." 



Prof. William Youatt says ("The Horse,*' p. 22G): 



" At the age now under consideration (the fourth 

 year) the tushes are almost peculiar to the horse, and 

 castration does not appear to prevent or retard their 

 development. All mares, however, have the germs of 

 them in the chambers of the jaws, and they appear 

 externally in the majority of old mares. Their use is 

 not evident. Perhaps in the wild state of the horse 

 they are weapons of offense, and he is enabled by 

 them to more firmly seize and more deeply wound his 

 enemy." * 



* Prof. C. S. Tomes says : " In the domestic races the tusks of 

 boars are much smaller than in the wild animal, and it is a curi- 

 ous fact that in domestic races which have become wild, the 

 tusks increase in size at the same time that the bristles become 

 more pronounced. Mr. Darwin suggests that the renewed 



