tOK R. lOMEKSON AND 11. V. OHALMEKS 



time of a minute, do you think this could be first only a burst of oxygen and an 

 uptake of CO2 much later? It makes a great difference in the theory whether you 

 have only oxygen first or both oxygen and CO2 simultaneously. 



Emerson: The measurements certainly indicate the CO2 ma.ximum to which 

 you refer, but it appears for only a single minute, and is therefore establishnd with 

 much less certainty than maxima which last two or more minutes. 



Arnold: The throat of the two vessels that Emorson and Lewis designed is the 

 same, with a larger gas space in one vessel. 



Emerson : All these experiments were done with that same type of vessel and 

 equal amounts of fluid in equally shaped lower portions were shaken in vessels 

 with different overhead gas volumes. 



Kok : We have made some determinations of the equilibration of CO2 and oxygen 

 in a few vessels and there might be about a twofold difference between the two 

 gases. 



Whittingham : In half-time? 



Kok: In half-time. I want to ask you whether you have calculated quantum 

 yields on your pressure changes. Do you find an (apparent) quantum yield of 1 

 for your optimum carbon dioxide bursts, i.e., is the effect of the same magnitude 

 as found by Warburg? 



Emerson : If you calculate as he did from the maximum of respiration in the 

 dark and maximum in the light, making some allowance for diffusion, you can 

 calculate without difficulty, a quantum requirement of less than 1 . 



