112 
INFLAMMATION OF THE EXTERNAL AUDITORY MEATUS. 
washing with a 5 per cent, lotion of equal parts of tannic and salicylic 
acids in spirit. Alcohol is of service, and 3 per cent, solution of resorcin 
in spirit can be strongly recommended. Butel recommends a 6 per cent, 
solution of boric acid in alcohol. This treatment must be repeated daily ; 
and where the disease has been neglected, and to prevent its return, 
must be continued for some weeks. No fluid must be left in the ears. 
If great pain be present, henbane oil is useful, Bayer, after cleansing, 
powders the ears with boric acid, while resorcin, iodoform, and other 
materials have been recommended; but less depends on the materials 
used than on their careful application. Nocard recommends using night 
and morning an ointment consisting of 10 parts of salicylic acid, 100 
parts of vaselin, and 20 drops of tincture of benzoin. A piece the size 
of a hazel-nut is placed in the ear. Internally, preparations of arsenic 
and iodine (Donovan’s solution) are useful. 
Exuberant granulations are removed with a curette, and, on account 
of their often possessing a neck, this is easy. 
Inflammation of the middle ear—that is, of the tympanum—is termed 
otitis media; that of the labyrinth, otitis interna; but neither is 
usually recognised during life. They occur from the spread of inflam¬ 
mation from the external meatus, or the entrance of foreign bodies. 
Attacks of delirium have been observed by Stadler and Schumacher 
in cattle, produced by acari in the middle ear (dermanyssus 
avium). Schiitz and Siedamgrotzky detected tuberculosis of the 
middle ear in pigs. In rabbits, formation of pus in the middle ear 
has produced epileptiform attacks, and dermatocoptes have also been 
found in the meatus and middle ear, causing cerebral symptoms. 
The animals sometimes made rotary, sometimes rolling movements. 
Manege movements have been seen in tuberculosis of the middle ear 
in pigs. 
In addition to those mentioned some rarer diseases of the outer ear 
may here be referred to. 
Tumours are commonest in dogs, and are chiefly represented by 
papillomata and fibromata; the former not infrequently follow otitis 
externa. They are also seen in horses. Their treatment is purely 
surgical, and follows general principles. Several observers have seen 
horns on the skin of the ear in cattle. 
Paralysis of the ear in horses is usually an accompaniment of central 
facial paralysis. Frick has seen primary paralysis of the levator 
muscles of the ear after the animal had been lifted by the ears. Rupture 
of the muscles can almost always be detected under such circumstances. 
Recovery is sometimes protracted. 
Neuralgia at the basis of the external ear accompanied by epileptiform 
attacks has been noted in carriage horses in which the bridle straps were 
