Experimental Researches on Vegetable Assimilation and RespirationIIIOn the Effect of Temperature on Carbon-Dioxide Assimilation . e leaf chamber in any of the experiments attemperatures below 0°. (If • * Where the respiration at a particular temperature has not been found experimentally, the amounthas been calculated from the respiration curve given in fig. 2. t The following experiment shows that this lack of water had no inhibitory effect (at low temperatures)on the assimilation. A leaf was set up in the chamber in the usual way, but without water. Three readings of the assimila- VEGETABLE A
Experimental Researches on Vegetable Assimilation and RespirationIIIOn the Effect of Temperature on Carbon-Dioxide Assimilation . e leaf chamber in any of the experiments attemperatures below 0°. (If • * Where the respiration at a particular temperature has not been found experimentally, the amounthas been calculated from the respiration curve given in fig. 2. t The following experiment shows that this lack of water had no inhibitory effect (at low temperatures)on the assimilation. A leaf was set up in the chamber in the usual way, but without water. Three readings of the assimila- VEGETABLE ASSIMILATION AND KESPIRATION. 65 The detailed results given in these tables are represented in the curve (fig. 2).The latter embodies the mean result of every experiment, Each point represents theaverage of the readings obtained in a single experiment only. Although, without exception, every experiment made is represented in fig. 2. yetthere are only two numbers which are anomalous, namely, two experiments at 14° C.(located by error at 12°5 in the figure) and of these the mean falls perfectly into line. <$ 20 Fig. 5 ou +y Temperature. -fio +15° +20° -¥Zf +30° +35° +40° tion were taken at the temperature of 5°8 0. Water was then introduced into the chamber, and, afterallowing the conditions to become constant, readings were again taken at the same temperature. Theresult was conclusive; no rise at all was produced in the assimilation, rather there was the inevitablefalling off, due to the length of the experiment. Experiment XXV,—February 18. 5°-8 0. i Time. All amounts are expressed in grammes of C02. Weight and area. CO? supplied. C02unassimilated. ApparentassimilatioD. Time. Temp. Controltubes. Tubes fromchamber. Difference. 1st weight, 1*57 , 43*0 sq. centims. „ ,, „ 5°-6 5-75-75-8 6-06-1 „ „Water 8
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