562 



HOW TO TEIJ. THE AGE. 



Lave attalnc"! t(j iieaily their full growtli, and the Koeoncl pair 

 ■will have so far displaced the temporary teeth as to appear throui^h 



¥ic.. 315.— At 4 to 4Vf years. 



I'lG. ;U0. — At 4 years. 



the gums, Avhile the corner ones Avillbe di- 

 minished in breadth, worn down, and the 

 mark become small and faint. 



At four years the central nippers w'ill l>e 

 fully developed; the sharp edge somewhat 

 worn oft', and the mark shorter, wider, and 

 fainter. The next pair will be up, but they 

 will be small, with the mark deep, and ex- 

 t<mding quite across them. 



At foui- years and a half, or between that 

 and five, the corner nippers are shed, and 

 the pei-manent ones begin to appear, some- 

 thing like cut 315. Tlie central nippers 



. , , , T , -i , . Fig. 317. — About 4 j'ears. 



are considerably worn, and the next pair 



arc commencing to sliow the marks of usage. The tush has now 

 protruded, and is fully a half inch in height; externally it has a 

 roundel ]jromiuenco with a grooA"«? or hollow in the inside. 



At five years the horse's mouth is almost perfect. The corner 

 nippers are quite up, with a long, deep, irregular mark on the in- 

 side, and the other nippers arc showing thfe effects of increasetl 

 Avear. The tush is much grown, the grooves on the inside are al- 

 most or quite disappeared, and ibe outer surface is regularly con- 



