THAT man has daily rhythms of body temperature, excretion and many other functions has been known for a very long time. Only recently has it been widely appreciated, however, that these rhythms are driven from within by a elocklike mechanism — that they are not simply a response to the environmental periodicities associated with the rotation of the earth, to which all life on this planet is subjected and wherein it has evolved. The role and importance of these living clocks in human physiology is only beginning to be appreciated. Today especially, in the age of jet and space travel, . . .
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