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 to freely use these organs in chewing its food. The 

 effort to avoid any stress upon the diseased tooth, 

 has caused those on the same side to suffer only 

 partial attrition ; hence they have become long and 

 slanting, presenting sharp pointed edges, which 

 lacerated the lining membrane of the mouth. The 

 incisors, a distant view of which is given, likewise 

 display the consequence of the animal's mode of 

 feeding. Turning from the teeth to the exposed cavities 

 above them, it will be seen that these are not sym- 

 metrical, or of equal dimensions, which in the head 

 of a healthy subject, they undoubtedly ought to be. 

 Those on the diseased side are not only the largest, 

 but differently formed. The alteration has resulted 

 from the inflammation and accumulation of pus 

 within them. Something besides pus, however, has 

 been thrown out. e represents the healthy maxillary 

 sinus as an empty space : d is the like part, but it is 

 here filled by a fine cellular structure composed of 

 bone, which has been produced by the action of 

 disease. The plates which form the cells are deli- 

 cately thin, and beautifully arranged : the little 

 cavities were once full of a thick and sanguineous 

 matter, and the larger spaces above them contained 



