Abstract
That the activity of a plant in the function of assimilation is influenced to a certain extent by the temperature to which it is subjected, has long been recognised, but, in spite of the universal acceptance of this principle, comparatively little detailed study has been undertaken in confirmation of it. The present investigation was undertaken at the suggestion of Dr. F. F. Blackman and has been carried out in his laboratory. The problem proved to be much more complex than was anticipated and I have to acknowledge, with great pleasure, my indebtedness to Dr. Blackman for frequent valuable advice and several important suggestions.

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