DENTITION AND AGE AS SHOWN BY TEETH, ETC. 



303 



when first matured, and have the marks almost worn out. As 

 with the others, a change next takes place in the corner 

 nippers. 



At four and a half, or between four and five, they begin to 

 strip, and are soon replaced by their successors. At this 

 period also the animal starts his tushes. They come up be- 

 tween the nippers and grinders, rather nearer the former than 

 the latter, but the distance increases as the jaw grows, which 

 continues until seven. 



At five, the mouth being full, the nippers all set, the four 

 tushes from three to five months 

 old, the colt becomes a horse, and 

 at the same age the filly a mare, 

 her mouth passing through the 

 same changes except as regards 

 the tushes, Avhich, in many cases, 

 do not appear at all, while in 

 others appear only small. Cut 

 !No. 5 shows the five-year-old 

 mouth, which is called the full 

 mouth. 



Cut "No. 6 represents the six-year-old mouth, with the mark 

 entirely gone in the front pair of nippers. There still remains, 

 however, a slight depression in 

 the cement filling of the center, 

 and this is, of course, sur- 

 rounded by enamel. This de- 

 pression is of a dark or brown 

 color. Outside of this ring of 

 enamel the bony substance is 

 also worn below the level 

 of the enamel, and also pre- 

 sents a stained or brown ap- 

 pearance. The second pair are 

 approaching the appearance of the first, the mark being short, 

 broad, and faint ; the corner ones show evident signs of wear. 



