310 



ELEMENTS OF AGRICULTURE 



FIG. 151. 



Side view at four 



years of age 



Fio. 152. 



Lower nippers at five 

 years 



Four Years. At four years, the second 

 pair of permanent nippers are just ready 

 for use, and the cups in the center pair 

 are about one-third gone. (Fig. 150.) 



Five Years. At five years, the third 

 pair of nippers are present and just meet. 

 The cups of the center 

 pair are about two-thirds gone. (Fig. 

 152.) 



Six Years. The cups in the center 

 pair have disappeared, or nearly so. 

 Those in the second pair are about two- 

 thirds gone. The third pair are up and 

 in full use. 



Seven Years. At seven years, the 

 cups are gone from the second pair of 

 nippers. There is then a notch in the 

 upper tooth where it overlaps the lower 

 one. (Fig. 156.) 



Eight Years. At eight years, the 

 cups are gone from all the nippers of 

 the lower jaw. We then look at the 

 nippers of the upper jaw. The cups will 

 then be present in the center pair, but 

 will not be deep. (Fig. 157.) 



Nine Years. The cups in the cen- 

 ter pair of nippers of the upper jaw 

 have disappeared, but they are still 

 present in the second pair, and fairly 

 deep in the third pair. 



FIG. 155. L. 



side view at six years Ten Years. The cups are gone from 



FIG. 153. 

 Side view at five years 



FIG. 154. 



Lower nippers at six 



years 



