. Chemical embryology. Embryology. 4o8 ON INCREASE IN SIZE [PT. Ill shown in Fig. 45. And the growth-rate per gram of embryo (Minot growth-rate divided by 100?) was also proportional to the amount of yolk remaining. Gray himself indicated a number of criticisms which might be brought against his views. Thus there is little a priori reason for sup- posing that the growth-rate of the embryo should be determined by the amount of yolk in the yolk-sac, for apart from anything else, the. 10 20 30 40 50 60 70 Fig. 45. Days of development. 80 90 100 amount and nature of the syncytium in the yolk-sac w
. Chemical embryology. Embryology. 4o8 ON INCREASE IN SIZE [PT. Ill shown in Fig. 45. And the growth-rate per gram of embryo (Minot growth-rate divided by 100?) was also proportional to the amount of yolk remaining. Gray himself indicated a number of criticisms which might be brought against his views. Thus there is little a priori reason for sup- posing that the growth-rate of the embryo should be determined by the amount of yolk in the yolk-sac, for apart from anything else, the. 10 20 30 40 50 60 70 Fig. 45. Days of development. 80 90 100 amount and nature of the syncytium in the yolk-sac wall might be a limiting factor. One would also expect that in the beginning when the yolk is very large compared to the embryo, the yolk would be present in excess, and would not exert any influence on growth-rate. 2-7. The Autocatakinetic Formulae The workers mentioned so far might be divided into three groups, those who have elaborated empirical formulae, those who have adopted the Minot point of view, and those who have treated the. 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 Needham, Joseph, 1900-. New York: The MacMillan Co.
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