of the Animals of the Farm. 
403 
Fig. 10. — Incisors of Horse at three years. 
mouth is closed ; but the teeth are distinguished by the 
recent appearance which they present in comparison with the 
worn surfaces of the teeth immediately behind them. 
From the completion of the third year to the termination 
of the fourth year, the changes which have been described in 
reference to the central incisors and the first and second molars 
occur in the lateral incisors, and the third and sixth molar. 
At three years off the same condition of the gum which was 
described in respect of the upper central temporary incisors, 
now appears at the necks of the lower lateral temporary 
incisors. At three years and a half some or perhaps all four 
of the permanent lateral incisors are in the mouth ; and soon 
afterwards the fourth and sixth permanent molars are cut, as 
shown in the drawing (Fig. 12, p. 404). 
No difficulty would be experienced in distinguishing the 
recent molars in the condition represented in the illustration. 
The first and second, and the fourth and fifth molars show con- 
siderable wear, while the new teeth present rounded points on 
2 D 2 
