Abstract
Summary
The O2-consumption of individual embryonated eggs was measured continuously for 3 days in constant conditions, including pressure. Superimposed on linear daily trend for Days 5, 6, and 8 was a mean pattern in hourly rates possessing a characteristic morning minimum and 7 P.M. maximum. This 7 P.M. deviation from daily trend was related to the concurrent 2-6 P.M. rate of atmospheric pressure change. This indicates that the solar daily variations of oxidative metabolism in the intact egg are a manifestation of extrinsic rhythmicality.
The author gratefully acknowledges the valuable suggestions and criticisms of Dr. F. A. Brown, Jr.
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