. The elements of experimental embryology. Embryology, Experimental; Embryology. Experimental imposition of a new primary axis in Corymorpha. In fragments of stem immediately after cutting {a) or after regeneration to form biaxial (c) or single hydranths, immersion in dilute alcohol causes dedifferentiation {b, g). On replacement in sea-water, redifferentiation occurs with a new axis at right angles to the old, with apical region at the centre of the free surface {c, d, h, i). (From Child, Physiological Foundations of Behavior, New York, 1924.) polarity must have been induced by external facto
. The elements of experimental embryology. Embryology, Experimental; Embryology. Experimental imposition of a new primary axis in Corymorpha. In fragments of stem immediately after cutting {a) or after regeneration to form biaxial (c) or single hydranths, immersion in dilute alcohol causes dedifferentiation {b, g). On replacement in sea-water, redifferentiation occurs with a new axis at right angles to the old, with apical region at the centre of the free surface {c, d, h, i). (From Child, Physiological Foundations of Behavior, New York, 1924.) polarity must have been induced by external Similar results have been obtained with hydroids (figs. 27, 132; see also p. 281). Thus, apart from the cogent theoretical reasons advanced by Child, there is abundant evidence, experimental and circum- stantial, for the view that the initial determination of an axis of polarity, or axiation, is due to the action of factors external to the developing organism. ^ Huxley, 1926; Brien, 1930. 2 H. V. Wilson, 1907, 1911; Child, 1928 b; Huxley, 1911, 1921 a. HEE 5. 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. ]
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