Diseases of the Digestive Organs. 131 



growth will ensue from the absence of wear. In other 

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

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

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

 the usual symptoms of disease of the teeth, with swelling 

 of cheek or tongue, tumefaction of the jaw or eTeis-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. i8— Tooth-rasp, 

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



CARIOUS TEETH. 



Caries is quite common in the grinding teeth but rare in 

 the incisors. 



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 colics 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 hability 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 

 with 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 



