12 In Figure 2 the temperature was 200 and, although only 2 days were recorded in DD, the period is obviously very close to 24 hours. Another experiment indicated a period of 25 hours at 18.50 C. 13 C. S. Pittendrigh, "Perspectives in the Study of Biological Clocks," in Symposium on Perspectives in Marine Biology (Berkeley: University of California Press, 1957) (in press).
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