222 
JELIANS’ WART-HOG. 
alveolae. The third, (in the upper jaw, and the 
second in the lower,) is strong, and as broad as 
the fourth ; its enamel surface contains five crown- 
globules, four of which occupy the corner, and 
one the middle. It is wedged into four separate 
alveolae, by means of four roots. 
With regard to these three first back teeth 
we would remark, that as age advances they 
gradually disappear, and none remain except the 
anterior ones. In one animal, greatly advanced 
in age, we find all three of them almost entirely 
destroyed. The third is diminished by two-thirds, 
and nothing remains of it but the crown surface, 
which keeps its position only by being wedged 
in between the fourth large one, and the second 
back tooth ; whilst the alveolae, which held its 
roots, have entirely vanished. But even this 
animal had all its upper and lower incisors 
still, although in a somewhat worn-out state. 
Fred. Cuvier, in explaining this circumstance, 
shews, that the fourth or posterior back tooth, 
which, in growing, is pushed forward towards the 
front, in the same manner as we find this in the 
Elephant, causes thereby the falling out of the ante- 
rior teeth. We admit the soundness of this view, 
and readily believe that the continual growing of 
the posterior back tooth should injure and remove 
the anterior ones, or even cause them to fall out. 
But besides, our attention has been directed by 
