MASTICATION. 



259 



The following figures, from the " Encyclopedic der gessammten 

 Thierheilkunde," indicate the changes occurring with age in the incisor 

 teeth of cattle (Fig. 104). 



Newborn. 8 Days. 4 Weeks. 



12 Years. 14 Years. 16 Years. 18 Years. 20 Years. 



FIG. 104. CHANGES FROM AGE IN THE INCISOR TEETH OF THE Ox. (Wilckens.) 



Dentition of Sheep. In the sheep it is by the displacement of tem- 

 porary and eruption of the permanent teeth that the age of the animal 

 is determined. 



TABLE OF EARLY DENTITION. 



TABLE OF LATE DENTITION. 



