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OF THE OSSIFICATION OF A TOOTH, ETC. 133
Teeth began to ossify at one point only, that ossification
gradually advances til] the Tooth is entirely completed ; but if
there are more than one point of ossification, each ossification
increases till their basis come in contact with one another, and
there all unite into one; after which they advance ingrowth as
one ossification.
The ossifications in their progress become thicker and
thicker where they first began, but increase faster on the
edges of the Teeth so as thence to become more and more
;
hollow, and the cavity becomes deeper. As the ossification
advances, it gradually surrounds the Pulp till the whole is
covered by bone, exceping the under surface : and while the
ossifications advance, that part of the Pulp which is covered by
bone is always more vascular than the part which is not yet
covered.
The adhesion of the pulp to the new-formed Tooth, or bone,
is very slight, for it can always be separated from it without any
apparent violence, nor are there any vessels going from the one
to the other ; the place, however, where it is most strongly
attached is round the edge of the bony part, which is the last
part formed. When the bone has covered all the Pulp, it
begins to contract a little, and becomes somewhat rounded,
making that part of the Tooth which is called the neck ; and
from this place the fangs begin. When the fangs form, they

rows on the surface of the pulp and send forth prolongations. The pro-
longation of the anterior end of one cell coalesces with the posterior
prolongation of another ; and in this way the tube is formed, which be-
comes afterwards calcified. Dr. Hannover has minutely described the
formation of cement, by the production of cartilage cells in what he
calls the cement germ, and subsequent ossification. (3) Robin and
Magitot, however, assert that he has described the proper tissue of the
organ of the enamel as being the organ of the cement, and that what
Hannover terms the " membrana intermedia " is only a modification of
the texture of the organ of the enamel at its internal face.]

(3) Vide ' Mcdico-Chirurgical Review,' 1857.