the Teeth of graminivorous Quadrupeds. 255 
cccc. The intermediate bony substance between the pro- 
cesses. 
Tab. XIV. 
The rudiments of the bony substance which makes a portion 
of the elephant’s tooth, preserved in spirit, before ossification 
had begun to take place. 
It is represented here, to show that it has an entirely different 
texture from the pulp on which the tooth itself is formed, and 
resembles the membranes in which ossifications have their 
origin, for the formation of the flat bones of animal bodies. 
In the more solid parts it resembles ligament ; but, where it 
is thin, as towards the terminations of the projecting portions, 
it is exactly similar to membrane. 
Tab. XV. 
A longitudinal section of the elephant’s tooth, highly polished, 
to. show more perfectly the different textures of which it is 
made up. These, being of- different degrees of hardness, bear a 
very different polish, which renders them distinct from one 
another: they are also distinguishable, by having different 
arrangements of the parts which form them. In the enamel, 
the texture is fibrous, and the direction of the fibres is trans- 
verse. In the processes, the texture is laminated, and the direc- 
tion of the laminae is longitudinal. In the bony part, there are 
no distinct fibres, nor laminae. 
In this tooth, a small portion only is completely formed, the 
rest being still in a growing state. The fangs are not yet added: 
there is, however, the origin of one of them, at that end of the 
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