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.

  • Allen Thomson
Date:
[1832]
Catalogue details

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.

    18/64 (page 12)
    attention, and, from the examination of the principal experi- ments which have been related concerning it, I think we shall be induced to adopt the last of these opinions, or that which supposes that the new vessels originate in the organizable lymph itself, and do not arise by loops from the primitive vessels or by a prolongation of their extremities, though their formation is not altogether independent of the general cir- culation or primitive vessels. Mr Hontkii was led by his observations to form an opinion somewhat resembling this. In observing the red isolated points that indicate the com- mencement of vessels in the organizing lymph, he remarked the similarity between their appearance and that of the rudi- ments of vessels on the surface of the yolk of the egg after about forty hours of incubation, and, by comparing these two processes, he endeavoured to explain the mode in which vessels are formed during adhesion ^. The observations on which this comparison was founded were not, however, suf- ficiently extensive or minute fully to] establish the analogy ; and, though many authors agreed with Mr Hunter in be- lieving, that, in the first stage of the formation of new ves- sels in lymph, no connection can be traced between them and the primitive capillaries, yet many supposed that this ought to be attributed to the imperfect opportunities and difficulty of investigation, rather than to the circumstance of these vessels being really isolated ; and, at the same time, some ob- servations made by others, such, for example, as that in the conjunctiva already alluded to, seemed to give more probabi- lity to the opinion that the new vessels are formed by the ex- of new vessels in lymph and cicatrices, established by artificial injections, the fact of their connection, when fuUy formed, with the primitive vessels. Dr Moxno has represented the new vessels in Ijnnph effused on the pen- toneum of the pig, which were fiUed from the epigastric arteries, and Dr SoKMMERiNG injected the new vessels on false membranes of the pleura from the intercostal arteries. These facts had also been established by the experiments of Duiiamel and Hunter—See Moano onihe Nervom Sys- tem, Plates 46 and 47- 1 Hunter on Inflammation, p. 92.