ENCLOSED IN THE TUSKS OF THE ELEPHANT. 65 



ensue on wounds of the tusks of the elephant explains many 

 curious appearances in ivory, and the difficulties anatomists 

 and physiologists have had in understanding them. 



It explains the drawings and descriptions of Klockner, 

 Ruysch, and Camper ; does away with the necessity of suppos- 

 ing, with Blumenbach, that true ivory is regenerated, or that it 

 can throw out ossific juice to produce cicatrices ; and leads us 

 to believe that Cuvier, in denying the possibility of the obli- 

 teration of a shot-hole, had allowed himself to be deceived. 

 All difficulties are got over and contradictions reconciled by 

 bearing in mind the different circumstances insisted upon in 

 this paper, namely 



1. That a tusk is an endogenous as well as an exogenous 

 organ. 



2. That the pulp forms irregular ivory round foreign 

 bodies, and at wounds on its surface. 



3. That the membrane of the follicle is an important agent 

 in closing up the holes produced by foreign bodies which pene- 

 trate a tusk through the socket. 



