with blood-discs, which were pressed together into polyhedrons,
and apparently stagnated and left out of the current of circulation
.T
hese aggregated blood-discs exhibited, in various and often
"The Council have since thought proper to request the Committee, to whom they have added
the President (a) and Vice Presidents (6) of the Geological Section of the Association at
Birmingham, to inquire into the authority supposed to be given to Mr. Nasmyth’s abstract by
a printed document, in the shape of a printer’s revise, purporting to be the report, by the
Editorial Secretary, Dr. Lloyd, of another paper of Mr. Nasmyth’s read to the Geological
Section, at the same meeting of the Association, which revise, he alleges, contains the following
passage, viz., *' the ivory is neither more nor less than the ossified pulp,’ and on which he founds an
argument that an affirmation to that effect had been distinctly made by himself in that
paper.
“ The present Committee, to whom this question has been specially referred, have procured,
through the kindness of Colonel Sabine, one of the General Secretaries, a certified copy (c) of
the original manuscript report referred to by Mr. Nasmyth, and which it appears was drawn up
immediately after the paper had been received, by Dr. Lloyd, one of the Secretaries of the
Geological Section. It is as follows :
“ (It is the subjoined document marked B.)”
“ On comparing this manuscript copy with the printed revise, as quoted by Mr. Nasmyth
at p. 3 of his printed letter to the Council, it appears that several alterations have been made in
the original in its progress to that stage of revision in which Mr. Nasmyth now produces it;
and in particular, that the expression quoted by him in italics, as especially corroborating the
fidelity of his abstract, is not contained in it.”
This needs no comment: it is here cited along with Mr. Nasmyth’s assertion to the French
Institute, that Schwann’s Treatise was unknown to him when he read his Memoir at
Birmingham, and with the statements which he hazarded in print, that he did not furnish the
Report to the Literary Gazette, and that the Report in the Athenasum had been so mutilated that
he could not be responsible for it, in order to show the value of that person’s subsequent
assertions on other points relating to the present worked)
(a) Dr. Buckland. Q>) Leonard Horner, Esq., Charles Lyell, Esq.
(c) “ A copy, certified by Dr. Lloyd, of the rough copy preserved by himself of the original
manuscript.”
(d) For the refutation of these assertions see Medical Gazette, July, 1340.
in striking degrees, those changes of the contained matter to
which I have elsewhere suggested that their own multiplication
might be due. In the present situation and condition it is obvious
that such changes must be preparatory, either to their disappearance
and removal, or to some important share which they are destined
to take in the development of the dental tissue. The stagnant
corpuscles nearest the vascular and unchanged pulp presented the
irregularity of contour, which has given rise to the term f mulberry,’
or ‘ granulated’ applied to such altered blood-discs, when seen in
other circumstances. These corpuscles in other respects, as colour,
size, and general form, retained their usual character. The blood-
discs nearer the cap of dentine exhibited more plainly the contained
granules, to the commencing development of which the irregular
contour above-mentioned is due: this appearance was associated
with an increase of size, a change from the circular to the elliptical
form, and a gradual loss of the characteristic colour, which was
longest retained by the central granular matter. The tunics of the
capillary vessel containing the above aggregated and altered blood-
discs become gradually attenuated, and disappear, as if dissolved,
before reaching the field of conversion. I once inclined to the
belief that these modified blood-discs afforded fresh cell-material
to supply the space left by the retreat of the circulating currents.
The open mouths ’of the central last-formed ends of the
calcified dentinal tubes are always ready to receive the plasma
transuded from the capillaries remaining in the uncalcified part
of the pulp or in those tracts of it which constitute the vascular
canals.
The enamel pulp differs from the dentinal pulp at its first
formation by the more fluid state of its blastema and by the fewer
and more minute cells which it contains. (PI. 1, fig. 4, h.) The
e