. Chemical embryology. Embryology. SECT. 4] HEAT-PRODUCTION OF THE EMBRYO 663 that in the early stages the eggs had a lower gaseous exchange during the 2nd hour than during the ist, but that in the later stages the reverse was the case, and the 2nd hour readings were greater than the ist. This was interpreted to mean a decreasing 60 cs 50 30 20 â bc 10 Temperature 30°C. Temperature 10° C 10 20 30 40 50 60 70 80 Time in hours Fig, 123 a (Buglia). 100 110 120 130 sensitivity with age to the effects of carbon dioxide in the ambient sea water. Returning to Fig. 123 a, the curve at 21° should be
. Chemical embryology. Embryology. SECT. 4] HEAT-PRODUCTION OF THE EMBRYO 663 that in the early stages the eggs had a lower gaseous exchange during the 2nd hour than during the ist, but that in the later stages the reverse was the case, and the 2nd hour readings were greater than the ist. This was interpreted to mean a decreasing 60 cs 50 30 20 â bc 10 Temperature 30°C. Temperature 10° C 10 20 30 40 50 60 70 80 Time in hours Fig, 123 a (Buglia). 100 110 120 130 sensitivity with age to the effects of carbon dioxide in the ambient sea water. Returning to Fig. 123 a, the curve at 21° should be taken as normal, and from that it is clear that there are three periods in the change of respiratory rate with time in the case of Aplysia, {a) from o to 35 hours, {b) from 35 to 50 hours and [c) from 50 hours onwards. The point marking the transition of period {a) to period {b) is the complete surrounding of the endoderm by the ectoderm, while. 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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