FEATURES OF ANIMAL FORM 45 



Three years. By two and one half years the middle 

 pinchers are through, and at three they are leveled and in 



FIG. 20. Lower jaw of the three-year-old colt. 



wear, while the milk intermediates are about to be shed 

 (Fig. 20). 



Four years. At three and one half the permanent in- 

 termediates come through and at four they are leveled 

 and wearing. At this age the corner milk teeth mani- 

 fest the approach of the permanent corners (Figs. 21 

 and 22). 



Five years. At four and a half the corners are shed, 

 the permanent corners appear and at five there is the so- 

 called full mouth, all permanent incisors being level and in 

 wear (Figs. 23 and 24). 



Six years. The cups of the lower pinchers wear away 

 and the canines in males may appear (Figs. 25 and 26) . 



Seven years. The cups of the lower intermediates 



