Diseases of the Digestive Organs. 223 



growth mil ensue from the absence of wear. In other 

 cases a tooth is displaced and failing to meet with a tooth 

 La the other jaw gets overgrown, cuts the soft parts and 

 sets up disease of these or of the jaw-bone. There ensue 

 the usual sjnoaptoms of disease of the teeth, with swelling 

 of cheek or tongue, tumefaction of the jaw or even a run- 

 ning sore, or a foetid discharge from the nose. The over- 

 grown teeth must be reduced with the tooth-rasp, cut with 



Fig. 18. 



Fig. l8— Tooth-rasp. 



looth-shears, or with a guarded tooth-chisel. 



CAEIOUS TEETH. 



Caries is quite common ia the gi-inding teeth but rare in 

 the iacisors. 



Symptoms. Slow, careful mastication, and dropping 

 from the mouth of half-chewed food (hay, green fodder,) 

 which, impelled by hunger, the animal takes in but fails to 

 swallow. Greedy swallowing of soft food, indigestions 

 and cohcs from imperfectly chewed aliment irritating the 

 stomach and bowels. The presence in the dung of undi- 

 gested, grain which has been swallowed whole. Un- 

 thrifty, staring coat, hide-hound, pale mucous membranes, 

 weak pulse, weakness, emaciation, and liability to sweat- 

 ing, and swelling of the legs are marked features. The 

 more specific symptoms are : swelling of the jaw-bone 

 over the diseased fang or even a running sore if in the 

 lower jaw, the accumulation of partially chewed food 

 around the tooth, and especially between it and the cheek, 

 tenderness of the tooth when touched or gently tapped 

 flfith the finger, the presence of a black spot on some part 

 of its surface, or of an excavated channel, leading from 

 the wearing surface down to the fang, or between the 



