. Analysis of development. Embryology; Embryology. Blood Island. Fig. 165. A, Ventral view of an axolotl, stage 31, showing blood island (dark) stained by benzidine. B, Amblystoma punciatum, stage 32, showing blood island (stippled) and area excised in experimental production of bloodless embryos. (A, after Slonim- ski, '31; B, after Goss, '28). marization by McDonald, '39). On the basis of their defect experiments on amphibians, Federici ('26), Goss ('28), Slonimski ('31) and Fernald ('47) do not attribute any eryth- rogenic potency to endothelium. Their ex- tirpations of blood-forming cells
. Analysis of development. Embryology; Embryology. Blood Island. Fig. 165. A, Ventral view of an axolotl, stage 31, showing blood island (dark) stained by benzidine. B, Amblystoma punciatum, stage 32, showing blood island (stippled) and area excised in experimental production of bloodless embryos. (A, after Slonim- ski, '31; B, after Goss, '28). marization by McDonald, '39). On the basis of their defect experiments on amphibians, Federici ('26), Goss ('28), Slonimski ('31) and Fernald ('47) do not attribute any eryth- rogenic potency to endothelium. Their ex- tirpations of blood-forming cells undoubtedly included endothelium-forming cells of the yolk region but approximately normal ves- sels developed within this region, presum- ably from cells migrating from the edge of the wound. Neither the endothelium of the regenerated vessels of the operated field nor that of any other region produced eryth- rocytes. Two views exist concerning the nature of the first free blood cells which develop in the blood islands: (1) the primitive cell is a hemocytoblast with potency to form primi- tive erythroblasts and leukocytes; or (2) the earliest free cell is a primitive erythro- blast (megaloblast). The controversy results. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
