NO. 24 TIME COURSE OF PHOTOSYNTHESIS McALISTER 9 



is a function of light, surely it would be a function of light intensity, 

 which here it is not. There is a progressive decrease of induction with 

 decreasing intensity. It should be pointed out that this induction period 

 or lag may be considered as due to a certain amount of carbon dioxide 

 lost to photosynthesis. When these amounts lost to photosynthesis 



Fig. 



-Comparison of efifect of temperature on the respiration of Honnidium 

 (Van der Paauw) and on wheat (circles). 



are properly calculated from the true assimilation rates, the values 

 plotted in the inset are obtained. This amount lost is approaching 

 zero at zero light intensity and is apparently approaching an asymp- 

 totic value at high intensity. This qualitatively checks with War- 

 burg's (1928) two experiments on Chlorella at about the same light 

 intensity. 



