42 



the imaginary growth of the horse's teeth. When 

 the roots are perfected, the length of the tooth is 

 completed, and the only after process consists in a 

 gradual deposition of earthy matter, within the body 

 of the member, the bulk of which is defined. In old 

 teeth, the ivory becomes very dense ; and he who 

 attempts to cut through an old and young tooth, will 

 be made aware of a contrast. The pulp in the teeth, 

 after the formation of the root, gradually diminishes 

 and ultimately disappears, in consequence of the 

 ossific deposition. In fact, when growth ceases, 

 consolidation has taken place, and rendered its con- 

 tinuance no longer necessary. 



22. The cavity of the pulp has been always stated 

 to exist in the tooth of the horse. In the human 

 tooth it occupies the extremity of the fang, being 

 situated within the substance of the ivory ; and the 

 double teeth are known to have as many cavities of 

 this kind as there are roots to the part. The same 

 has been assumed to be the case also with the horse, 

 but I cannot say that investigation enables me to 

 corroborate this opinion. I find no cavity, that is no 

 empty space, constantly present in the fangs of the 



