Abstract
The gas exchanges which accompany the reduction of ferricyanide by Chlorella and Anabaena have been reinvestigated using a recording mass spectrometer. In the dark there was an oxygen dependent production of excess carbon dioxide; in the light an equivalent amount of oxygen production occurred. When ferricyanide was added in the light in the absence of both oxygen and carbon dioxide, production of carbon dioxide began immediately while oxygen production exhibited the usual induction period associated with prolonged an-aerobiosis.

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