DISEASES OF THE DIGESTIVE ORGANS. I3X 



"rom the absence of wear. In other cases a tooth is displaced, 

 • nd failing to meet with a tooth in the other jaw gets overgrown, 

 cuts the soft parts, and sets up disease of these or of the jaw- 

 ■)one. There ensue the usual symptoms of disease of the teeth, 

 .vith swelling of check or tongue, tumefaction of the jaw or 

 ivcn a ruiinaig soic, or a fuetid discharge from the nose. 'I'he 



Fig. 18. — Tooth-rasp. 



''■vergrown teeth must be reduced with the tooth-rasp, cut with 

 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 roiics from 

 imperfectly chewed aliment irritating the stomach and bowels. 

 The presence in the dung of undigested grain which has been 

 swallowed whole. Unthrifty, staring coat, hide-bound, pale 

 mucous membranes, weak pulse, weakness, emaciation, and 

 liability to sweating, 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, tht. 

 presence of a black spot on some part of its surface, or of an 

 excavated channel, leading from the wearing surface down to 

 tne fang, or between the tooth and the jaw-bone, this cavity 



