On the development of the blood and blood-vessels, being the prize essay for 1854 of the Edinburgh Harveian Society / by James Drummond, M.D.

  • Drummond, James.
Date:
[1854]
Catalogue details

Licence: Public Domain Mark

Credit: On the development of the blood and blood-vessels, being the prize essay for 1854 of the Edinburgh Harveian Society / by James Drummond, M.D. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    occur either free or included within a cell-walh These particles are occasionally seen to contain a smaller body in their interior. They swell out oil addition of acetic acid, assuming often an oval or round shape, and then gradually fade away. Car- ' ^ bonate of soda does not pi'oduce any .veiy ,i - -tv v marked effect upon them. Tuqoentine was '^o, added to them. They did not, however, ap- . -o .V pear to be changed by it. 2dj Bodies mea- ;' ° ^-^n>, suring from the jo'^ot^i to the ^g'ojyth of an inch in diameter. These are generally round, rarely oval in shape (fig. 1, h), are clearer and apparently more delicate th.an the bodies above •* a described. In some of them are seen a few very minute granules; in others there are thf'Liluro^°fX's'otum'! larger granules, similar to. >those floating free, o, Upuud and ohionc-fi-a- and situated towards one side of the cell; ^J^l^^,^ again, ni others, we find slearine plates. Some- Ri-cifated around it. d,Vw- times they appear to be half-filled with these; fftc*pi^'yoficceil. 250dia. They frequently contain one or two minute, sj)herical jiarticles. 3d> Masses,of a round, irreguhu*, or oval shape, formed merely of granules similar to those described No. 1 around the bodies No. 2, and without any distinct investing membrane or cell wall (fig. 1, c). 4th, Perfect cells, consistini;; of a transparent external membrane, en- closing a body similar to No. 2, wdiich seems to hold the relation of a nucleus, and also a quantity of gi'anular matter (fig, 1, d). The cells in question present a more or less dark grey appearance, and have some resemblance to the bodies occUi'dng in organs: during inflam- mation—the compound granular cell. When isolated, they com- monly present a I'ound or oval shape, but when aggregated togetlier they appear to be more or less angular. The granular matter tiiey contain is sometimes present in such quantity, as to obscure the nucleus, or conceal it entirely from view. They vary considerably in size. • In many, the contained gi'anules ftre nearly all large, and present the angular character already described; in; othei's, they are smaller and round. , Tliese bodies, which piay be termed embryonic or primary cells, liave been divided by Prevost and Lebert into two classes. The one is termed by them the vitelline globules, the other, the organo- plastic globules. The former, Hccordipg to these, observers, is splierical or ova! ; the spherical measure about O-Oo to 0-0875 of a millimetre in dianieter; in those which are not spherical, the longi- tudinal diameter is about 012o of a millimetre, while theii-trans- verse dianieter varies between 0075 and 0875. The granules with wJiich they a.re, filled belong chiefly to the larger oblong variety. IJ'he organo-plastic globules are perfectly spherical, measure from 0;02 to 0-03 of a millimetre in diameter, have a brownish-vellow colour, or brown colour, and contain a nucleus which resembles those in, ,thei vitelline globules, exce])ting that; ill is smaller, nicasur-