Abstract
Willstatter and Stoll have studied the rate of photosynthesis as a function of chlorophyll content, but their experiments fail to reveal any regular relationship between these 2 quantities, probably because, in order to obtain material differing widely in chlorophyll content, they were obliged to use leaves which were not comparable in other respects. A method is described for varying the chlorophyll content per unit volume of cells of Chlorella vulgaris, maintaining other factors constant. Experiments show that the maximum rate of photosynthesis is a smooth function of the chlorophyll content.

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