43 



horse's teeth, and no separate or defined cavities at 

 the roots of the molars. The bone or ivory may be 

 deficient, more or less, towards the centre of the 

 fang ; but this space, not yet occupied by the osseous 

 deposit, is filled by a membraneous substance w^hich 

 is continuous with the crusta petrosa of the root, and 

 will ultimately be converted into bone. I cannot 

 separate the tissues forming the pulp, from the crusta 

 petrosa itself; and I assume the two to be continuous. 

 The only difference I can observe is, that the tissue 

 of the pulp is the finest ; but as the vessels of the 

 one primarily pierce through and ramify upon the 

 other, I cannot perceive the necessity for their sepa- 

 ration. It will be understood, that I am speaking of 

 these parts in a fresh subject, and not alluding to a 

 mascerated and dried specimen, the appearance pre- 

 sented by the last being calculated to mislead. With 

 age, the pulp diminishes ; and in a tooth extracted 

 from a very old animal, no positive remains of it will 

 be found — osseous matter filling up the space which 

 the pulp once occupied. 



23. Nature provides the horse with tivo sets of 

 teeth. The first are small, or of a size proportioned 



