The physiology of photosynthesis / by Sir Jagadis Chunder Bose.

  • Jagadish Chandra Bose
Date:
1924
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Licence: In copyright

Credit: The physiology of photosynthesis / by Sir Jagadis Chunder Bose. Source: Wellcome Collection.

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    are at the same temperature, there being no variation of temperature in the plant-vessel caused by the passage of light which had its heat-rays previously absorbed by a thick stratum of water ; the experiment, moreover, lasts for three minutes only. T hese precautions are sufficient to maintain a constant temperature of the water in the vessel. Finally, the serious and unknown loss through transpiration is com- pletely absent in aquatic plants immersed in water. The efficiency of the photosynthetic organ is the ratio of the energy stored to the total energy absorbed. The energy stored can be accurately determined from the photo- synthetic evolution of oxygen. The energy absorbed is found from the difference in intensity of the incident and of the transmitted light, as measured by the two inde- pendent methods of the Calorimeter and the Radiometer. I will describe the experimentation for the determina- tion of photosynthetic efficiency in the following order : Experimental methods and appliances. The Bubbler. The Magnetic Radiometer. The Calorimeter. Measurement of energy by the Calorimeter. Thermo-electric couple for measurement of temperature. Elimination of loss of heat by radiation. Determination of coefficients of transmission and absorption. (1) By Calorimetric Method. (2) By Radiometric Method. Determination of the stored energy. Determination of the photo synthetic efficiency. Experimental Methods and Appliances A diagrammatic representation of the apparatus and method of experimentation is given in the illustration (fig- 55)- A is tlie aPerture 2x1-5 cm. through which
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