DEAFNESS 133 



midin or aristol, or bismuth formic iodid, and boric 

 acid (one ounce). 



An ear cap or bandage should then be applied to 

 prevent the patient ilapping his ears, and means 

 should be taken to prevent scratching of the ear. 

 With some very sensitive animals it is a good policy 

 to keep them under the influence of H-M-C until 

 the irritation has subsided, otherwise it may be im- 

 possible to prevent the patient aggravating the trou- 

 ble by his continual efforts to scratch, rub, or flap' 

 the ears. 



After the first treatment, all subsequent dressings 

 should be in powder form, washing the ear or pas- 

 sage or the use of lotions or liquids of any descrip- 

 tion being only productive of pain. It is surprising 

 how even the most obstinate cases of canker yield 

 to dry dressing after resisting even the most con- 

 scientious treatment with fluid antiseptics. 



In the parasitic form, after cleansing the ear as 

 before described, the most effectual parasiticide is 

 one dram unguentum hydrargyri nitratis and one 

 ounce oil of almonds, the ear being smeared with 

 the ointment and the canal filled with it, and the 

 meatus plugged with cotton wool. The ear cap is 

 applied as in an ordinary case and the ear cleaned 

 up again on the thii^d day, after which the treat- 

 ment consists of dry dressings as in simple canker. 



Deafness 



An inability to hear may be either congenital or 

 acquired. The former is incurable, and need not be 

 considered further. Acquired deafness may be the 

 result of an undue accumulation of wax, catarrh of 

 the external auditory canal, ulceration of the tym- 

 panum, abscess and destruction of the middle ear, 

 new growths, or paralysis of the auditory nerve. 



The only cases that are at all amenable to treat- 



