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A great deal of research has been done on the diurnal variations in different forms of animal and human activity. The first diurnal variation to be observed was the one in body temperature, and it is the one most widely recognized today. Similar diurnal variations have been observed in a series of other physical processes. Extensive surveys of the literature have been given by Holmgren (1936), Jores
Bjerner et al. (Fri,) studied this question.
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