. The elements of experimental embryology. Embryology, Experimental; Embryology. Fig. 73 A, Two dorsal gastrula-halves of Triton grafted together so that the directions of invagination of their blastopores are directly opposed. B, The resulting embryo, showing crossed doubling, or duplicitas cniciata; each half-gastrula has produced a posterior trunk region with spinal cord, but two heads and brains are formed, at right angles to the axis of the trunks, each formed partly from both half-gastrulae. (Redrawn from Morgan, Experimental Embryology, New York, 1927, after Spemann.) of the neural plat
. The elements of experimental embryology. Embryology, Experimental; Embryology. Fig. 73 A, Two dorsal gastrula-halves of Triton grafted together so that the directions of invagination of their blastopores are directly opposed. B, The resulting embryo, showing crossed doubling, or duplicitas cniciata; each half-gastrula has produced a posterior trunk region with spinal cord, but two heads and brains are formed, at right angles to the axis of the trunks, each formed partly from both half-gastrulae. (Redrawn from Morgan, Experimental Embryology, New York, 1927, after Spemann.) of the neural plate and the width of the primitive gut-roof in different groups of Vertebrates:^ the former is dependent on the latter. Turning to experimental results, the production by operative 1 Marx, 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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