9& 



NATURAL HISTORY OF THE HORSE. 



mark irregular in the inside, and the other nippers bearing evi- 

 dent tolvens of increased wearing. The tush is much grown ; 

 the grooves have aUnost or quite disappeared, and the outer 

 surface is regularly convex. It is still as concave within, and 

 with the edge nearly as sharp, as it was six months before. 

 The sixth molar is quite up, and the third molar is wanting. 

 This last circumstance, if the general appearance of the animal, 

 and particularly his forehand, and the wearing of the centre 

 nippers, and the growth and shape of the tushes be likewise 

 carefully attended to, will prevent deception, if a late four- 

 year-old is attempted to be substituted for a five-year-old. 

 The nippers may be brought up a few months before their time, 

 and the tushes a few weeks, but the grinder is with difficulty 

 displaced. The last three grinders and the tushes are never 



shed. 



At six years, as in the 



annexed cut, the mark on 

 the central nippers is worn 

 out. There will still be 

 a difference of color in 

 the centre of the tooth. 

 The cement filling up the 

 hole, made by the dipping 

 of the enamel, will pre- 

 sent a browner hue than 

 the other parts of the 

 tooth ; and it will be evi- 

 dently surrounded by an edge of enamel, and there will remain 

 ever a little depression in the centre, and also a depression 

 round the case of enamel ; but the deep hole in the centre of 



BIX YEARS. 



