. The elements of experimental embryology. Embryology, Experimental; Embryology. Fig. 153 Partial twinning in trout brought about by reduced oxygen supply during pre- gastrulation stages. Left, unequal components, anterior duplication. Centre, anterior duplication, unequal components: component on the left has a very small head and is cyclopean. Right, a subnormal individual, with only one eye, no mouth, gills or tail fin, and much reduced trunk, is attached to the surface of the yolk-sac opposite to the larger normal individual. (Redrawn after Stockard, Anat. xxviii, 1921.) depres
. The elements of experimental embryology. Embryology, Experimental; Embryology. Fig. 153 Partial twinning in trout brought about by reduced oxygen supply during pre- gastrulation stages. Left, unequal components, anterior duplication. Centre, anterior duplication, unequal components: component on the left has a very small head and is cyclopean. Right, a subnormal individual, with only one eye, no mouth, gills or tail fin, and much reduced trunk, is attached to the surface of the yolk-sac opposite to the larger normal individual. (Redrawn after Stockard, Anat. xxviii, 1921.) depressant agencies, brings about the depression of its level of activity below that of the immediately neighbouring regions. These, in all cases where the original embryonic area is a flat plate or blastoderm, as in fish, birds or mammals, will be symmetrically situated right and left of the original apical point. Interesting confirmation of the truth of this interpretation is pro- vided by the cases of twinning presented by the Oligochaetes. As mentioned above, these worms are characterised by the presence of. 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 Huxley, Julian, 1887-1975; De Beer, Gavin, Sir, 1899-1972. New York [Hafner Pub. Co. ]
Size: 984px × 2538px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
