THE DIGESTIVE SYSTEM 



73 



The formula for the temporary or deciduous teeth of both male 

 and female horses is : 



. ■ 3 „ ^ 3\ 



2 (w-5 bM 



M.S 



M.2 



Fig. 20. — Upper teeth, hard palate, and adjacent part of soft palate of horse: 

 1.1, First incisor; 1.2, second incisor; Di.3, deciduous third incisor; P.l, "wolf 

 tooth" or first premolar; P.2-4, premolars; M.l-3, molars; 1, groove of palate ; 2- 

 ridges of palate; 3 soft palate. (Sisson, Anatomy of Domestic Animals.) 



As soon as these teeth erupt two influences are at work to destroy 

 them — the permanent teeth are gradually encroaching on their 

 roots, while the crown is becoming short and shorter under the 



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