Outlines of physiology and pathology; with a supplement to the physiology. Embracing an account of the most recent additions to that science / [William Pulteney Alison].

  • Alison, William Pulteney, 1790-1859
Date:
1836
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of physiology and pathology; with a supplement to the physiology. Embracing an account of the most recent additions to that science / [William Pulteney Alison]. Source: Wellcome Collection.

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    9. When lymph has been effused from injured or in¬ flamed vessels, files of globules of blood often gradually make their way through it, and the tracks which they follow become capillary vessels, nearly in the same way as the first globules of the blood arrange themselves on the germi¬ nal membrane of the chick in ovo, before the heart acts or the bloodvessels are formed.* ‘ Even if it be granted that several of these observations may have been fallacious, there will remain enough un¬ contested to establish a proposition which is so strongly supported by the analogy of the lower animals, and the ap¬ plication of which to the difficulty above stated, as to the local determinations of blood in the higher animals, is so obvious and satisfactory. The contracted condition of the arteries of a stump, or of the main artery of a limb which has been tied, when con¬ trasted with the distended state of the collateral branches in the latter case (see p. 30), seems also inexplicable, if the blood, at any part of the arteries, is supposed to be moved only by a vis a ter go. And the microscopical observations of Haller, and of Kaltenbrunner, on the manner in which the blood deserts the branch of a vessel, so obstruct¬ ed—licet lumine hiet aperto—and passes into anastomosing branches, clearly indicates the efficacy of some attracting power, modifying the effect of the vis a tergo.\ This would be strongly confirmed if it should be found that a foetus, however imperfect, could exist without a heart, and alone in the womb. Such cases are stated to have oc¬ curred, but have not been reported with sufficient care to entitle us to rely on them.j That the peculiar chemical changes, which are wrought on the blood in all parts of the body, should be, to a certain * * Haller, Mem. &c. Exp, 180. Kaltenbrunner, Exp. &c. p. 22, et seq. Gendrin, Hist, des Inflammations, § 1566, et seq. Royer Col- lard, Essai d’une Systeme de Zoonomie, p. 80. ■f Haller, Mem., &c. Exp. 54. Kaltenbrunner, 1. c. § 20, 21. £ “ Cohaeret. in vix non omnibus talibus monstris funiculus cum placenta infant is gemelli normalis.”—Eli? in, De Acephalis, 8qc. p. 116.