118 



The Maximum Efficiency of Photosynthesis 



j>co2 Cubic mm. of CO2 produced by the action of AJ x fin the cell Sus- 



pension. 



-r quantum requirement per molecule O2 produced \~pt~\ 



yo 2 and jyco2 were computed by use of Eqs. 10 and 11, JJ by use of 

 Eq. 13, and^by use of Eq. 14. 



In all experiments the temperature of the thermostat was 20° C. and the spectral 

 region of the added red light of the intensity IJwas 630-660 m//. . IJshould usualla 

 not exceed 6 cu. mm. 02/min. (0.27 microeinsteins/min.) under our prevailing 

 conditions. 



Experiment 1 



May 30, 1949 



Acid culture medium. 270 cu. mm. of cells in each vessel. 5% CO2 in air. 



47 = 5 - 4 



AJ = 5.4 



No. 5 

 Respiration over-compensated 



No. 3 

 Respiration over-compensated 



yoz + 46.3 cu. mm. 

 _yco2 — 47.6 cu. mm. 



— 1.03 







AJ x 25 

 46.3 



= 2.9 



