A probationary essay on the formation of new blood-vessels : submitted, by the authority of the President and his Council, to the examination of the Royal College of Surgeons of Edinburgh, when candidate for admission into their body, in conformity to their regulations respecting the admission of ordinary Fellows / by Allen Thomson.

  • Thomson, Allen, 1809-1884.
Date:
[1832]
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Licence: Public Domain Mark

Credit: A probationary essay on the formation of new blood-vessels : submitted, by the authority of the President and his Council, to the examination of the Royal College of Surgeons of Edinburgh, when candidate for admission into their body, in conformity to their regulations respecting the admission of ordinary Fellows / by Allen Thomson. 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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    The most complete series of microscopical observations on the formation of new vessels that has hitherto been published, is contained in a Dissertation by Dr Kaltenbrunner, on the state of the Blood and Vessels during Inflammation'. The observations of this author on Adhesion, Suppuration, &c. made on the web of the foot and on the mesentery of the frog, on the tail-fin of the mudfish, on the gills of the water- newt, on the mesentery of rabbits and mice, and on many other parts of these and of other animals, though mixed up with much theory and new nomenclature, and by no means de- scribed in a clear style, must be considered as a valuable con- tribution to our knowledge of these subjects, and seem to ren- der the isolated origin of bloodvessels in lymph very pro- bable. The researches of Doctors Gruithuisen and Kalten- BRUNNER concerning the mode in which vessels are formed in adhesive inflammation, derive additional support from the investigation of the growth and development of vessels in the state of health. The very beautiful observations of Harvey, Wolff, Pander, and others, have long ago shewn that the blood and vessels appear simultaneously in the vascular area of the yolk in the incubated egg, and that their origin is, to a certain extent, independent of that of the heart and general circulation. It is now well known that those vessels in which the first circulation begins, exist, though in a somewhat im- perfect condition, and contain a fluid which afterwards be- comes blood, before they directly communicate with the heart, and before motion commences in that organ; and it is therefore obvious, that the formation of the vessels does not, in this instance, depend on any impulsion, or vis a terg-o, from the heart. Spallanzani 2 appears to have been the first who made 1 Experimenta circa statum Sanguinis et Vasorum in Inflamniatione, cum 9 tab. Monachii, 182G. 2 Kxperiments on the Circulation of the Blood, translated by R. Hall, M.D. Lond. 1811.