TEMPERATURE CHARACTERISTIC FOR PRODUCTION OF CO(2) BY PHASEOLUS SEEDLINGS.

The temperature characteristic for respiratory production of CO(2) by young seedlings of Phaseolus aureus (Roxb.) is micro = 16,500 calories, 12-21 degrees C., even when the analyses depend upon the use of many seedlings crowded in a small respiration chamber, provided reasonable precautions are taken to avoid injury and to permit proper thermal adaptation. There is evidence of a definite critical temperature at 20-21 degrees . These findings agree quantitatively with those obtained with other similar seedlings, and contradict the results reported by Kurbatov and Leonov (1930); the reasons for this are analysed.