164 PRACTICE OF EQUINE MEDICINE. 



lutition, position of head or exercise, and by the swelhng in the 

 parotid region. 



How may it be differentiated from pus in the sinuses? 



By swelling over the sinus, by dulness on percussion associated 

 with pain, and by the discharge, which is usually offensive. 



Give the prognosis. 



The case seems to hang on unless treated, and is quite a grave 

 condition. Death may result from asphyxia or gangrenous pneu- 

 monia. 



What are the indications for treatment when pus is 

 present ? 



This is rather difficult to treat, and when it attends colt dis- 

 temper it may have to be opened on account of the interference with 

 the respiration. Be careful when opening, on account of the blood- 

 vessels in that region. Cut through the skin with a scalpel, and 

 then, by the use of a trocar and canula, the cavity containing pus 

 may be found. Then, by the use of a blunt-pointed bistoury and 

 your finger, carefully enlarge the opening until you reach the cavity. 

 Now wash out the cavity with mild disinfectant solution. 



By using your finger in these cases you avoid much hemorrhage. 



An operation is often performed called hyovertebrotomy, which 

 is one of the most delicate operations we have to perform. Eoughly 

 speaking, it consists in making an incision above and one below, and 

 passing a seton through. 



These animals should receive their hay off the floor, so as to 

 keep their heads in a low position, which allows the pus a better 

 chance to escape. It is well to turn these animals out to grass. Ex- 

 ercise is also beneficial. 



Keep manger clean and disinfected. 



2. DISEASES OF THE OESOPHAGUS. 



FOEEIGN BODIES IN THE (ESOPHAGUS. 

 Choking. 



What is the causation ? 



Food, as carrots, apples, potatoes, bread, and the like, that have 

 not been properly masticated, or foods that are not properly in- 



