748 



EXAMINATION FOR AGE. 



Dates of Teething. 



As a rule, the incisors of the upper jaw make their appearance 

 sooner than those in the lower jav/. At birth, the central milk 

 incisors show themselves under the gum (Fig. 215), and come 

 through it about a week later on. The lateral milk incisors show 

 through the gum at the age of about five weeks ; and the comer 

 milk incisors, when the animal is about nine months old. The 

 eruption of the central, lateral, and corner permanent incisors 

 respectively takes place at from 2J to 3, 3J to 4, and 4J to 5 

 years after birth (Cornevin and Lesbre). 



Cornevin and Lesbre (" Traite de L'Age des Animaux Domes- 

 tiques ") state that the tushes very rarely come through the gum 

 before the age of four years; that they are well in view at 

 four and a half; and, at five years, are about the same length 

 as the corner incisors. Solleysel has pointed out that the tushes 

 of the lower jaw nearly always precede those of the upper jaw, 

 by two or three months. M. Constant has observed that the 

 tushes of the lower jaw appear at about the same time (51 to 52 

 months old) as the permanent corner incisors of the upper jaw; 

 and those of the upper jaw, at about the same time (54 months 

 old) as the permanent corner incisors of the lower jaw. 



At, or shortly after, birth, the foal has twelve milk back teeth 

 (premolars) ; namely, three on each side of each jaw. These 

 teeth take up the position that are subsequently occupied by the 

 2nd, 3rd and 4th permanent premolars. 



According to Cornevin and Lesbre, the dates of the eruption 

 of the permanent premolars are as follows: — 



The 1st molar appears at from 10 to 12 months; the 2nd at 

 about 2 years ; and the 3rd, at about 4 years. As I have al- 

 ready stated, the molars are not preceded by milk teeth. 



My experience is that the respective eruption of the lower molara 

 precedes that of the ujoper molars, in a manner soinewhat similar 

 to that of the permanent premolars, 



