98 



Journal of Agriculture, Victoria. [10 Feb., 1919. 



At three years the fronts of the central incisors are in wear (see 

 Plate I.). 



At three years and six months the lateral permanent incisors appear 

 (see Plate II.). 



Plate I. — At three years old. 



Plate II. — At the age of three years and six months. 



At four years the fronts of the lateral incisors come into wear (see 

 Plate IIa.). 



At four years and six months the comer permanent incisors may he 

 seen (see Plate III.). 



