. The elements of experimental embryology. Embryology, Experimental; Embryology. 8o ORIGIN OF POLARITY, SYMMETRY, AND ASYMMETRY between these results and those on the newt is doubtless to be ex- plained as a result of the precocious appearance of bilaterality in the egg of Amphioxus, extending to chemo-diiTerentiated substances, which is established immediately after fertilisation. As suggested. Fig. 34 Double monster of Amphioxus, produced by mechanical disarrangement and partial separation of the blastomeres in the 2-cell stage. Note that both com- ponents show normal asymmetry, i^, ist gill
. The elements of experimental embryology. Embryology, Experimental; Embryology. 8o ORIGIN OF POLARITY, SYMMETRY, AND ASYMMETRY between these results and those on the newt is doubtless to be ex- plained as a result of the precocious appearance of bilaterality in the egg of Amphioxus, extending to chemo-diiTerentiated substances, which is established immediately after fertilisation. As suggested. Fig. 34 Double monster of Amphioxus, produced by mechanical disarrangement and partial separation of the blastomeres in the 2-cell stage. Note that both com- ponents show normal asymmetry, i^, ist gill-cleft; eg, club-shaped gland; m, mouth; p, preoral pit. (From Conklin, Journ. Exp. Zool. lxiv, 1933.) in the preceding paragraph, this rigid bilaterality might establish an equally rigid asymmetry-gradient (fig. 34). §4 The conclusions arrived at from a consideration of the results obtained from experiments on amphibian development are sup- ported and extended by experiments on Echinoderm larvae. In. 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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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
