356 
On the Teeth of the Ox, Sheejj, and Pig, 
by wear. By the side of the lateral incisor is seen the corner perma- 
mnt tooth c. t. Behind this appears the permanent tush p. t., and 
between this and the molar teeth, the /;?rmolar (p. M.). Beneath 
the three anterior molars, which are temporary, ai'c seen the per- 
manent molars 1, 2, 3, contained in tlieir capsules. The numerals 
4 and 5 also represent the corresponding permanent molars — 
the latter of these just cutting the gum ; a fact which materially 
assists us in arriving at a correct opinion of the animal's age. 
Behind the fifth molar, the sixth or last (G, fig. 51) is seen, 
being, like the three anterior permanent molars, covered by 
its capsule and also deeply imbedded in the jaw. 
To pass to twelve months. At this date the most important 
change is the fall of the middle temporary incisors and the occu- 
])ation of their site by the permanent teeth. The tushes also 
are now Avell grown (see fig. 52). The permanent incisors, m. i., 
Fig. 52.' 
M . 1. 
differ less from the temporary than perhaps might be expected. 
Still an attentive examination will show that, being recently 
put up, they are of a whiter colour than the others. They are 
also a little broader and flatter in form. Their chief difference, 
however, consists in the existence, on their upper or inner sur- 
* Fig. 52 represents the front part of the lower jaw at one year old. 
