36 



to the marks of the nippers, are of comparatively 

 slight extent, soon obliterated, and not generally 

 found in any of these teeth after the horse is six 

 years old ; indeed all the marks are often obliterated 

 before the fifth year. 



18. To distinguish an upper from a lower molar 

 tooth is not difficult. The presence of the infundi- 

 bula in the first would alone enable it to be pointed 

 out ; but there are other indications that are worthy 

 of a passing notice. The table of the upper molars 

 is much broader, being compared to those of the 

 lower jaw as nine is to five. Then the form of the 

 table is different in each. The table of the lower 

 tooth is indented on either side, the indentation ex- 

 tending downwards along the fang. The table of 

 the upper molars present two narrow prominences, 

 and two broad grooves on the outer side ; and also 

 exhibits one broad prominence upon the centre of the 

 inner side — all of these development being likewise 

 contained along the fang. The slant of the tables 

 also differs. In the upper jaw, the outer edge is the 

 lowest. In the lower jaw, the tables incline in the 

 opposite direction. 



