Abstract
1. 1. Analysis of anthrone-responsive sugar concentration in the blood of Carcinus maenas shows that the haemolymph sugars exhibit a cyclic pattern which is related to tidal state, with peak values associated with the low tide period. 2. 2. The rhythm is maintained for several days in constant darkness and can be entrained by tidally-phased laboratory cycles of hydrostatic pressure. 3. 3. Both characteristics establish the endogenous nature of the blood-sugar rhythm.
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