The Maximum Efficiency of Photosynthesis 125 



Then 17.5 mg. KNO3 was added to each vessel, to give 2.5 g. KNO3/I. 



This experiment shows that there is no striking effect of KNO3 in the medium on the photo- 

 synthetic efficiency. In very prolonged experiments, of course, removal of a necessary constituent 

 from the culture medium must infiuence the efficiency. 



Continued, but compensated mainly from below with light from an incandescent lamp filtered 

 through a red glass which transmitted wavelengths longer than 560 mit. 



No. 5 No.3 



5' J 4- 18 5 / C7 + 47) + 22.5 



5' J + 16.5 5' (jf + Jjf) + 25.0 



5'J + 16.0 5'(J + ZlJ) + 20.0 



15' J + 50.5 15' C7 -r JJ) + 67.5 

 20' H' + 22.7 



^02 = + 32.3 cu. mm. ) _ _ Q2 

 .V0C2 = — 33.0 cu. mm. J ^ 



1 = i ö L x_20_ =35 

 32.3 



