190 OSSEOTTS SYSTEM. 



nor re-deposited; on the whole, the question is by no means 

 a settled one. 



Q. What vital property is conspicuous in the mem- 

 brane of the teeth ? 



t/2. Animal sensibility to a most acute degree. 

 Q. What sympathies are excited by diseases of the 

 teeth? 



#. Those of animal sensibility, and of animal contracti- 

 lity. The first is exemplified in the pains of the teeth ; 

 the second in the convulsions produced by teething. 

 Q. Present examples of the organic sympathies. 

 Ji. Those of sensible organic contractility, such as vo- 

 miting, purging, and increased frequency of the heart's 

 action. You see those of organic sensibility and of insensi- 

 ble organic contractility in the profuse salivary discharges 

 from dentition, and other tooth affections; you see them 

 likewise in the swellings of the face. 



Q. How do the teeth usually sympathize with each 

 other? 



<fl. They sympathize in the frequent affections of cor- 

 responding teeth, on the opposite sides of the face. 



Q. To what tissue does the membrane lining the tooth 

 belong? 



*#. It is serous; as evidenced by its appearance, by its 

 having the double night-cap fold, and by the fluid exhaled 

 from it. 



Q. How is formation of the bony part of the tooth con- 

 ducted? 



#. In layers, as it were, from without inward. This 

 is done for the protection of the outer part of the tooth, 

 as that part is first exposed to the'contact of foreign bodies. 



