60 



PHYSIOLOGY AND TEMPERANCE. 



added at the back part of each side of both jaws, thus making 

 in all thirty-two teeth. These are the permanent set. They 

 begin to take the place of the others when the child is six 

 and a half years old, and are not completed until the wisdom 

 teeth are cut. The wisdom teeth appear anywhere between 

 the seventeenth and twenty-first year, but are occasionally 

 later. . Each tooth has its root, or fang, the crown, or top of 

 the tooth, and the neck, or portion between the root and the 

 crown. 



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Fw. 20. The Adult Teeth: 1, 2, the incisors; 3, canine; 4, 5, bicuspids; 

 6, 7, 8, molars. 



The teeth are divided into four kinds : incisors, canines, 

 bicuspids and molars. The incisors, four in number in each 

 jaw, placed in front, are for cutting the food. They have 

 sharp edges. The four canines, two in each jaw, one on 

 each side, resemble the teeth in cats and dogs, who use them 

 for seizing and holding their prey. Next to these, two on 

 each side, in both jaws, are the bicuspids, and behind these 

 twelve molars or grinders, in lots of three to each correspond- 



