. The elements of experimental embryology. Embryology, Experimental; Embryology. 66 ORIGIN OF POLARITY, SYMMETRY, AND ASYMMETRY Once the axis of polarity has been determined in an egg, it often becomes manifested by a stratified and graded distribution of egg- contents, some of which may be visibly distinct, such as pigment, fat, yolk, etc. ( Arbacia). It is to be noted, however, that this stratification of materials is only an effect and not a cause of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co

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. The elements of experimental embryology. Embryology, Experimental; Embryology. 66 ORIGIN OF POLARITY, SYMMETRY, AND ASYMMETRY Once the axis of polarity has been determined in an egg, it often becomes manifested by a stratified and graded distribution of egg- contents, some of which may be visibly distinct, such as pigment, fat, yolk, etc. ( Arbacia). It is to be noted, however, that this stratification of materials is only an effect and not a cause 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. ]

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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology