552 ABSCESS OF TUKBINATED BONE. 



of the jaw, the skin is then divided with a scalpel, and an 

 opening is obtained into the pouch. A tape tied to the 

 staff is passed through the two openings made, and left 

 in the pouch as a seton. Through the lower orifice the 

 pouch must be washed daily, and astringent lotions may 

 be injected, and the horse constantly fed from the ground. 

 In about three weeks the seton is removed, and if the case 

 has been properly managed, the animal may be discharged* 

 3iired. 



I have now to speak of chronic nasal discharge connected 

 with organic lesion of the facial bone. 



I. Abscess of the Turbinated Bone. This occurs chiefly 

 in colts, and only on one side of the head. It supervenes on 

 a severe coryza, attended with difficult breathing and swell- 

 ing of the schneiderian membrane. For some time the dysp- 

 noea is so considerable as to lead to the belief that a polypus 

 is forming. This opinion may be apparently confirmed by 

 deformity of the nasal bones, such as is seen in the annexed 

 engraving. (See Fig. 142.) 



The nasal discharge, in such a case, varies in quantity, and 

 may be termed intermittent. Instead of the flow occurring 

 when the head is depressed, as in cases of impaction of the 

 guttural pouches, it is noticed, when the animal elevates its 

 nose, and immediately after coughs and drops its head, that 

 an abundant expulsion occurs. This diagnostic character of 

 the disease is readily explained. It is at the upper part 

 of the turbinated bone that the opening for the escape of pus 

 occurs. It is only when the cavity is full to overflowing, or 

 when the pus can be thrown out by an uptilting of the head, 

 that it can possibly find its way into the nasal chamber, 

 and as in flowing back into the pharynx it approaches the 

 sensitive larynx, a fit of coughing leads to its forcible expul- 

 sion. 



