ELEPHANT. 



655 



present on that part of the tooth over which such layer extended : 

 but the enamel-pulp, which passed with Cuvier for the internal 

 layer, unquestionably ceased to exist at the base of the crown or 

 body of the tooth ; therefore Cuvier denies that the fang has any 

 covering of cement. That substance, nevertheless, does cover 

 the whole exterior of the fang, though it forms a much thinner 

 layer than upon the crown : its characteristic tissue is shown in 

 PI. 150, fig. 2, c, in a magnified section of the end of a root of 

 an Elephant's molar, and it is often thickest at this part, where, in 

 the Cuvierian hypothesis, it would be furthest from its formative 

 organ, the inner layer of the capsule. 



The conversion-theory of dental development as propounded 

 and established in the present Work leads to no such difficul- 

 ties : its truth is manifested in the same way as that of the un- 

 dulation-theory of light and of every other right theory : viz. by 

 its concordance with facts which are denied or misinterpreted on 

 the wrong theory, and by its more rational explanation of all the 

 phenomena. 



THE END. 



LONDON: 



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