INDUCTION PHENOMENA IN ALGAE 411 



shortened the half-time for the attainment of the steady state, re- 

 moving or at least obscuring the initial burst. The effect of fluoride 

 was observed only if added at the beginning of the preceding dark 

 period and not if added immediately before illumination. 



The data are consistent with the views of Calvin et at. if we sup- 

 pose that the oxygen production of the initial burst is related to re- 

 duction of PGA by some path other than reduction to triose, e.g., 

 formation of alanine, malic, or oxalacetic acids. (See diagram I.) 



Reference 



1. Franok, Pringsheim, and Lad, Arch. Biochem., 7, 103 (1945). 



