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EXOSTOSIS. 33

the point some distance toward, and occasionally all
the way to, the neck of the tooth. In some cases, it
extends entirely round the root, and in others, is con-
fined to one side. It sometimes results in such an
enlargement of the root, especially if it is near the
point, as to render the tooth very difficult of removal.
When it is bulb-form, the entire attachment of the

tooth may be broken up, so as to allow this to rotate
in the socket, and yet the tooth be very difficult to
remove; indeed, in some instances, impossible, with-
out cutting away a portion of the process.
The density of the deposit is usually greater than
that of the root on which it is found; though in this
respect there is considerable variation : in a few in-
stances we have found it softer than the root proper.
The surrounding parts are absorbed for its accommo-

dation. The color of the substance is slightly yellow,
not differing much from that of the root itself; and
frequently it exhibits a semitranslucent appearance.
The rate of its formation varies considerably, some-
times increasing so rapidly as to occasion much diffi-
culty, and at other times seeming to advance very
slowly ; and frequently it is arrested altogether.
Roots are often found affected with exostosis, that

have been dead and crownless for a number of years.
and yet have never, so far as known, given any trouble
c