VE TERINAR T DENTAL S URGER T. 201 



only a small portion of the crown itself remaining. 

 The hole was sufficiently large to admit the little 

 finger. The mystery was solved. The process of 

 mastication had deposited the food in the sinus. 

 The fourth grinder was absent, having been lost 

 evidently from previous disease. 



"On examining the right side of the head, we 

 found the turbinated bones and membranes covering 

 the septum nasi comparatively healthy, but we dis- 

 covered a cyst, about the size of a walnut in the max- 

 illary sinus. It contained limpid fluid, and occupied 

 the space immediately over the root of the fourth 

 grinder tooth, which was decayed and quite loose 

 and below * the level of the other teeth. The teeth 

 of the lower jaw appeared healthy." 



"Without further examination, Surgeon Smith 

 sent the head to the Editor of The Veterinarian 

 who says: 



"The mare (that being the sex according to the 

 teeth), we should take to have been about twenty 

 years old. Her incisors are sound and so are the 

 grinders of the lower jaw. But in the near (left) 

 upper jaw, the second, fourth and sixth teeth are in 

 a state of progressive decay, and the same is true of 

 the fourth tooth on the off side. The vacuity caused 

 by the defective last grinder has opened a passage to 

 the antrum through which the food has passed, and 



* Italics Clark's. 



