VETERINARY DENTAL SURGERY. 197 



toms: great emaciation, dejected appearance, staring 

 coat, listlessness and a disinclination to move about. 

 There was a discharge from the right nostril of a 

 greenish yellow color mixed with blood (the animal 

 had just been fed hay and also allowed to pick a 

 a small quantity of grass), very fetid, slight abrasions 

 of the mucous membrane lining the nostril. The 

 discharge contained small pieces of hay and grass, 

 some of which could also be seen well up in the 

 nostril. 



On making an examination of the teeth I found 

 the right fourth upper molar partially decayed and 

 presenting a deep cavity. This cavity had connec- 

 tion with the maxillary sinus. The tooth was re- 

 moved by trephining, the horse making a rapid 

 recovery. 



TREATMENT. 



Remove the cause, then make an opening at the 

 most dependent part of the sinus, allow the pus to 

 escape and inject the cavity with warm water con- 

 taining a small amount of carbolic acid or common 

 salt. This injection may be effected with a common 

 syringe or an injection pump, the latter being prefer- 

 able as it throws a constant stream and does not 

 irritate by being constantly inserted and again with- 

 drawn in order to be refilled. Too much force 

 should not be used for the mucous membrane is very 

 tender and sensitive. A common rubber tube may 



