SEASONAL VARIATION OF THE CHLOROPLAST PIGMENTS IN SEVERAL PLANTS ON THE MALL AT WASHINGTON, D. C

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Abstract
The amount of carotin, xanthophyll, and total chlorophyll present in 5 plants was determined, about every 2 weeks, during the growing season. There was considerable fluctuation in the amount of chloroplast pigments present in green leaves, but the study was not sufficient to establish the factors which influence pigment formation.