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through the gum. The alveolar processes become enlarged,
or seem to rise in proportion to the elongation of the
roots of the temporary teeth. The situation as well as con-
nexion of both sets of teeth, can be easily understood from
the representations, &c. Albinus was perfectly acquainted
with the foramina through which the connecting membranes
passed, and concerning which he makes use of the follow-
ing words. " The sockets in which the permanent incisores
are contained, extend to the margin of the jaw ; not far from
it gradually becoming more contracted, and at length termi-
nating in a small hole : the hole which belongs to the socket
of the first incisor, is placed behind the first of the decidu-
ous incisores, in the interval between it and the second ; that
which belongs to the second, in like manner is placed behind
the second of the deciduous incisores, in the interval between
it and the canine tooth. The socket of the new canine tooth,
extending only a little beyond the bottom of the socket, in
which the deciduous canine tooth is contained, thence ter-
minating in a narrow little canal, before it terminates in this
canal, it gradually becomes more contracted. The sockets
of the new jaw teeth, (the bicuspides) do not extend by any
hole to the margin of the jaw. I find these penetrate into
the bottom of the deciduous sockets, and first indeed into the
internal part of its roots."* Nothing can be more accurate
than this description, but it has been taken from dried jaws,
otherwise he certainly would have discovered the connecting
membranes.
We have seen the membrane of the posterior temporary
grinder, and that of the anterior permanent grinder intimate-
ly connected together and contained in the same socket, but

" Acad. Annotat. lib. 11, pages 13, 14 and 16.