492 ALPHABETICAL SUMMARY. 
NASAL POLYPUS. 
Symptoms. — An enlarged nostril; a copious mucous discharge ; 
sigus of suffocation, if the free nostril be stopped; a cough generally 
forces down the growth. 
Treatment.—Surgical operation, which removes the tumor. 
NAVICULAR DISEASE. 
Causes.—_Frog pressure, and not shoeing with a leathern sole. The 
unprotected foot treads on a rolling stone, and navicular disease is the 
result. 
Symptoms.—Acute lameness; this disappears, but may come again 
in six or nine months. Acute lameness is then present for a longer time, 
while the subsequent soundness is more short. ‘Thus the disease pro- 
gresses, till the horse is lame for life. The pain in one foot causes 
greater stress upon the sound leg, and from this cause both feet are 
ultimately affected. The foot is pointed in the stable. The bulk 
diminishes, while the hoof thickens and contracts. The horse, when 
trotting, takes short steps, and upon the toe, going groggily. 
Treatment.—Feed liberally upon crushed oats and old beans. Soak 
the foot every other night in hot water. Afterward bandage the leg, 
fix on tips, and having smeared the horn with glycerin, put on a sponge 
boot. Rest very long—six months in the first instance—and then give 
three months agricultural employment. In bad cases resort to neu- 
rotomy, but do so upon the second attack of lameness; because con- 
tinued disease disorganizes the internal structures of the hoof, and also 
occasions the sound foot to be attacked by navicular disease. 
NEPHRITIS, OR INFLAMMATION OF THE KIDNEYS. 
Causes.—Bad provender, or niter in a mash, and long or fast work 
upon the following day. 
Symptoms.—Hard, quick pulse; short breathing; pallid membranes; 
looking at the loins; depressed head; roached back; hind legs strad- 
dling; scanty urine; refusing to turn in the stall; and crouching under 
pressure on the loins. Subsequently, pus is voided with the water. If 
the urine has a fetid odor, if blood be present, if the pulse grows 
quicker, if pressure gives no pain, and if the perspiration has a 
urinous smell, death is near at hand. To be certain of nephritis, insert 
the arm up the rectum and move the hand toward the kidneys. 
