12 



necessarily a different position; and as the 

 teeth do resemble, though greatly exceeding in 

 size, those of the hyppopotamus which are 

 in the back of the jaw, and consequently not 

 worn 'y except that in the latter there are sel- 

 dom more than three prongs, or blunt-pointed 

 protuberances, on the surface, which is after- 

 wards worn down ; whereas in this animal the 

 large teeth have four and five, and the small 

 teeth three and four ridges of high conic pro- 

 cesses, very differently arranged from those 

 of the former: besides that, in the hippo- 

 potamus, the enamel which commences, as in 

 the sheep, upon the outside, likewise pervades 

 the substance of the tooth, and renders 

 them, when ground Jlat (as they always are in 

 adult animals)^ efficacious in reducing the ve- 

 getable food; whereas in the Mammoth 

 the enamel is wholly superficial, and the 

 tooth never wears flat, because it has not the 

 grinding motion. 



Mr. Collinson, Member of the Royal Socie- 

 ty, in a letter on this subject to M. Buffon*, 



* BufFon, Tome XIII. Notes juflliicative, page 224. 



