. Chemical embryology. Embryology. SECT. 4] HEAT-PRODUCTION OF THE EMBRYO 735 but the others equate well with those of Magnus-Levy, and form the basis of our knowledge of the process. The gradual rise of heat- production during pregnancy is particularly well shown in the figure of Root & Root, reproduced here as Fig. 163. From the 6th month it steadily rises until, at 6 weeks before birth, it is 23 per cent, higher than at 4 months. The total increase in weight, however, was only 14 per cent., and a non-pregnant woman showing a similar increase. Fig. 163. in weight would only have increase
. Chemical embryology. Embryology. SECT. 4] HEAT-PRODUCTION OF THE EMBRYO 735 but the others equate well with those of Magnus-Levy, and form the basis of our knowledge of the process. The gradual rise of heat- production during pregnancy is particularly well shown in the figure of Root & Root, reproduced here as Fig. 163. From the 6th month it steadily rises until, at 6 weeks before birth, it is 23 per cent, higher than at 4 months. The total increase in weight, however, was only 14 per cent., and a non-pregnant woman showing a similar increase. Fig. 163. in weight would only have increased her heat-production by 5 per cent., according to the tables of Harris & Benedict or Aub & Dubois. Similar results were obtained by Sandiford & Wheeler. Murlin & Carpenter had shown in 1911 that if the energy exchange of a preg- nant woman at the gth month were compared with the energy exchange of the mother post partum, the metabolism total in each case was exactly the same except for a balance of 4 per cent, in favour of the pregnant woman. This means that there is no de- flection in the energy consumption curve at birth, that the maternal organism and the foetus function as two separate units in their consumption of energy, arid that the rise of heat production during. 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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