130 



THE RURAL EFFICIENCY GUIDE STOCK 



o 3 Years 



S..., 3'A to 4 Years 

 4 ' > to 5 Years 



Sketch of the permanent incisors, 

 indicating the order in which they ap- 

 pear in pairs. The central pair of 

 permanent incisors m both the upper 

 and lower jaws appear when the horse 

 is about two and one-half or three 

 years of age, the next pair replace 

 the temporary incisors when the horse 

 is about four years of age, and the 

 outside pair, making a. full mouth, 

 usually appear at five years of age. 



Passing to the permanent incisors in the 

 upper jaw at nine years the central pail 

 have almost completely lost their mark 

 At ten those adjoining these have reachec 

 the same condition, while at eleven th< 

 marks have about vanished from all 01 

 the permanent incisors. It will be noticec 

 that as the age advances the appearance o1 

 the worn tables assumes a more tri 

 angular form. 



jfvEN YEARS 



Lower Incisors 



EIGHT YCAR> 

 Lower Incisors 



At five years it will be noticed that marks 

 are very distinct and the tables worn but 

 slightly in all of the incisors. At six years 

 the center pair in the lower jaw show some 

 wear, the mark becoming smaller. At seven 

 years the second pair have nearly lost their 

 marks, while at eight the third or outside 

 pair show considerable wear with but a 

 trace of the mark. 



OwYows 



Comparison of a five-year-old mouth witl 

 one that is twenty years old, showing th< 

 marked contrast that develops, as age ad 

 vances, in the slope of the teeth as viewec 

 from the side. To Goubaux and Barrier'; 

 "Exterior of the Horse" the author is greatl] 

 indebted for the prints of horses' teeth whicl 

 have been shown. These have been modifiec 

 somewhat to bring out more clearly the neces 

 sary distinctions. 



