546 INJECTION OF FLUIDS INTO THE NOSE. 



persons advocate twitching; occasionally the ear may be 

 twitched; the animals sometimes require to be blindfolded, 

 but at others it is best to let them see what is being done ; 

 and most frequently not the slightest trouble attends the in- 

 jection. It is an invaluable method of using remedies in 

 the treatment of diseases of the nose. 



There are many remedies very active in checking nasal 

 discharge, and the- best appears to be the arsenite of strchy- 

 nia. It should be given in three or four grain doses daily, 

 made up in a ball with common mass. The effects of the 

 remedy must be narrowly watched by a veterinarian. I have 

 used the liquor potassae arsenitis in ounce doses daily, given 

 in food, or the following powder : 



ft Acid, arsen 3j. 



Sodae carb. Jij. 



Pulv. sem. coriand iv. 



Mix. Divide into twelve powders. One to be given daily in food. 



The administration of arsenic in chronic nasal catarrh calls 

 for attention, and should be stopped when irritation of the 

 visible mucous membranes is noticed, and the alimentary canal 

 is disturbed. An occasional dose of aloes may be very useful, 

 and if any other tonic is preferred to arsenic, it should be 

 selected from amongst the salts of iron, especially the sul- 

 phate, sesquioxide, and iodide; salts of copper have been 

 largely used, but I do not advocate them. 



II. Nasal Discharge dependent on Accumulations of 

 Pus in the Nasal and Frontal Sinuses. In severe catarrh 

 a dense pus fills the cavities communicating with the nasal 

 chamber, and usually escapes through an opening shown in 

 the annexed cut. (See Fig. 139.) 



Symptoms. When a discharge from the nose proves de- 

 cidedly chronic, and on percussion of the sinuses a dull 

 sound is emitted, the source of the flow may be readily de- 



