THE ENERGETICS OF PHOTOSYNTHESIS 



45 



Fig. 25. The interior of the Ulbricht sphere (photograph taken in Prof. Warburg's institute). 



If we write «/'„ = /, we findf 



E = iFt (6) 



The value of E can be expressed in cal or in /xl quanta. If red light with 

 a wave-length of 6600 A is used, then, according to Table 1, 



1 mole quanta = 43300 cal 



f Henceforth the intensity absorbed will be denoted by i 



