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Abstract
Mean hourly activity every day and daily urinary volume and pH have been recorded for two groups of male hamsters between autumn 1966 and autumn 1967. The experiments took place under natural lighting conditions indoors with no specific climatic control. Lunar modulations appeared in all records. Urinary volume was greatest on the same day of the lunar month as the minimum for activity, while pH showed maxima around full moon.
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Notes
217 Chiswick Village, London W.4, Great Britain.