. Chemical embryology. Embryology. SECT. 3] AND ORGANISATION 551 Murray's presentation of the facts does bring an order into a realm where order is much needed. But it is not ahogether easy to see why increase in dry weight should be regarded as "chemical growth", for water is just as much a chemical compound as anything else. Why should the title of chemical compound be restricted to those bodies which do not happen to be liquids at room temperature? And the wetness. Deyas 11 13 Incubation age Fig. 94- of the embryonic body must also exercise a profound influence on the speed and na
. Chemical embryology. Embryology. SECT. 3] AND ORGANISATION 551 Murray's presentation of the facts does bring an order into a realm where order is much needed. But it is not ahogether easy to see why increase in dry weight should be regarded as "chemical growth", for water is just as much a chemical compound as anything else. Why should the title of chemical compound be restricted to those bodies which do not happen to be liquids at room temperature? And the wetness. Deyas 11 13 Incubation age Fig. 94- of the embryonic body must also exercise a profound influence on the speed and nature of the chemical reactions going on within it, as is emphasised in the work of Ruzicka and his school. There is therefore some reason for objecting to the term "chemical growth", though the simple fact that rate of increase in dry weight follows an opposite course from rate of increase in wet weight ( "growth") is plainly of importance. There is less reason for objecting to the term "chemical differentiation", for Murray uses it to refer to such entities as percentage of ash and percentage of fat, and shows that, although for by far the greater part of the embryonic period 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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