2 56 Mr. Home’s Observations on the Structure of 
tooth which is most perfect, and which has had a small portion 
pf its grinding surface in use. 
Tab. XVI. 
The grinding surface of the African elephant’s tooth, to show 
that the processes of which it is made up, are of a different 
shape from those which compose the tooth of the Asiatic ele- 
phant. 
To see the true shape of each process, it is necessary that the 
points should be worn down to some depth, which, in the present 
specimen, is only the case with the four largest ; the other three, 
which are less worn, show the different thicknesses of the pro- 
cesses, nearer their termination on the upper surface of the 
tooth. 
Tab. XVII. 
A longitudinal section of a portion of the African elephant’s 
tooth, highly polished, to show the relative situation of the sub- 
stance of the tooth, the enamel, and the bone, of which it is 
composed. The cavity of the tooth, and the fang, are also 
exposed. 
A thin narrow slip of the bony part only is seen between the 
processes, in consequence of the processes, in the central line of 
the tooth, coming nearly in contact with each other. 
Tab. XVIII. 
A side view of the skull of the Sus JEthiopicus, ( half the na- 
tural size,) to show the situation and appearance of the large 
grinder, and the remains of the alveoli belonging to the fangs 
of the preceding one. 
