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DENTAL TISSUES. 95
upward around the bases of these scale-like teeth, to support them
more firmly and render them more useful.
If we compare the structure of the hair with that of the tooth, we
find in the case of the hair a horny structure formed by epithelial
cells resting upon a papilla of connective tissue ; in the case of the
tooth, a calcified structure formed by epithelial cells resting upon a
papilla of connective tissue which is also partially calcified.
Tlie relation of the bones of the jaws to the teetli is entirely a secondary
and transient one. The bone grows up around the roots of the teeth to
