84 



DIGESTION. 



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

 rough surface, suitable for holding and crushing the food. 



FIG. 19. SECTION op THE JAWS RIGHT SIDE. 



V, A, N. Veins. Arteries, and Nerves of the Teeth. The root of one tooth in each 

 jaw is cut vertically to show the cavity and the blood-vessels, etc., \\ithm H. 

 1 to 8, Permanent Teeth. 



The third molar, or " wisdom tooth," is the last to be cut, 

 and does not appear until about the twenty-first year. 



