258 Mr. Home’s Observations , &c. 
Fig. 4. A transverse section, polished, similar to those of the 
other teeth. 
Fig. 5. A view of the grinding surface of a shedding tooth, 
to show the uncommon appearance of its surface, before it is 
worn by use. The fangs have been absorbed. 
Fig. 6 . A longitudinal section of a full grown tooth, to show 
the plate of enamel passing down the centre : on one side, the 
enamel passes lower down than on the other. 
Tab. XXI. 
This plate contains three views of a grinding tooth of the 
rhinoceros, to show its shape and internal structure. 
Fig. 1. A view of the grinding surface, taken obliquely, seen 
from the side of the tooth next the mouth, to show the middle 
space, which is hollow, between the two projecting walls of the 
tooth. 
Fig. 2. A front or external view of the tooth, showing its 
shape and size, also t he number of its fangs. 
Fig. 3. A transverse section of the tooth, polished, to show 
the peculiar shape of the middle space, and the irregular pro- 
jecting portions of the tooth, in that direction ; also the mode in 
which the enamel surrounds every where the substance of the 
tooth. 
