CHAP. II.] THE CAT'S GENERAL FORM. 33 



rapidly absorbed away by tlio aid of the blood-vessels — first the 

 cement, then the dentine, and even part of the enamel — till what is 

 left becomes loosened and falls out. As the new tooth rises into the 

 place of its predecessor, the bone of the jaw becomes simultaneously 

 modified by absorption and redeposition, so as accurately to fit its 

 fang — a strildng example of that wonderful power of harmonious 

 and spontaneous modification which pervades the living body. 



