118 



DIGESTION 



canines stand next, one on each side of the jaw ; these receive 

 their name from their resemblance to the long, pointed tusks 

 of the dog (Fig. 25). 



9. The bicuspids, next in order, are larger and have a 

 broader crown than the former; while behind them are the 

 molars, the largest and most powerful of the entire set. These 



FIG. 24. SECTION OF THE JAWS 

 1' 2' 3' 4' 5'. The Milk Teeth ; 1" to S". The Germs of the Permanent Set 



large back teeth, or " grinders," present a broad, rough surface, 

 suitable for holding and crushing the food. The third molar, 

 or " wisdom tooth," is the last to be cut, and does not appear 

 until about the twenty-first year. The arrangement of the 

 teeth is indicated by the f ollowing dental formula : 



M -3 M 



