Canadian Practitioner Volume 27

Canadian Practitioner Volume 27

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ...what is True, that is, until Beard's rather startling observations upon the origin of leucocytes is confirmed. According to this observer the first, and indeed the main development of leucocytes is to be found as a process of proliferation and metamorphosis of the hypoblastic epithelium of the follicles of the fetal thymus gland. Beard's observations were published eighteen months ago, but to the best of my knowledge they still lack confirmation. Leo Loeb, also Arch./. EntacUngt, ifech., 1898, 'Bd. vi., and Medicine, April, 1890), has thought to see connective tissue cells undergoing origin from the Malpighian layer of the skin: his observations have not gained acceptance. In lower forms of life, however, some definite cases have of late been brought forward of regeneration of hylic from lepidic tissues. the original tissue from which a heterotopic glandular tumor has had its origin, but we are absolutely sure that that original tissue giving rise to a glandular tumor has not been of the connective tissue type. We may therefore, I think, lay this down with confidence that tumors in which the cell arrangement is of the lepidic type, presenting columns or groups of cells, devoid of any stroma between the members of these columns or groups, have been developed from one or other lepidic tissue, and not from one of the hylic or pulp tissues. 4. We cannot, with equal confidence, make the converse statement, that tumors of the hylic type have always originated from hylic tissues and not from lepidic. 4a. I believe that I am right in stating that lepidic tumors of epiblastic and hypoblastic origin, however rapidly they grow, however extensive and distant be their metastases, always even in their most aberrant portions, retain lepidic properties....show more

Product details

  • Paperback | 328 pages
  • 189 x 246 x 18mm | 585g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236839676
  • 9781236839671