174 

 progressing. Here, therefore, is an additional cause 

 at work, and hence the excess of effect. The arteries 

 which nourish the pulp, and the crusta petrosa, pro- 

 ceed from the vessels which nurture the bone, and 

 supply the mucous membrane of the sinuses with the 

 means of secretion. The same, likewise, may be 

 stated of the nerves going to the tooth, and though 

 through these last the constitution is affected, it is 

 mainly through the agency of the blood vessels, 

 that the sinuses become diseased. Hence the neces- 

 sity for decision, and the need of judgment, in the 

 application of the remedy. To enforce the foregoing 

 remarks, and convey to the reader a slight idea of 

 the consequences which ensue from a carious tooth, 

 the accompanying wood-cut is introduced. The spe- 

 cimen selected for illustration, does not exhibit a rare 

 or extraordinary proof of the results of this species 

 of disease. 



