1078 THE LIGHT FACTOR. I. INTENSITY CHAP. 28 



inhibition agree with this simple explanation; the same is true of the 

 fluorescence measurements. It is, for example, not clear why the concen- 

 trations of cyanide needed to markedl}^ affect fluorescence are so much 

 higher than those needed to inhibit photosynthesis. These and the results 

 obtained with several other poisons and narcotics require so many ad hoc 

 explanations that we do not want to attempt them here. Parallel measure- 

 ment of gas exchange and fluorescence in the presence of various inhibitors 

 seems to be a very promising approach to the unravelling of the complex 

 happenings in the photosensitive chlorophyll complex; but the presently 

 available results are hardly sufficient to warrant a detailed attempt. 



Franck — to whom we owe both the fundamental concepts of fluorescence 

 and the demonstration of how these concepts can be usefully applied to the 

 study of photosynthesis — has WTitten two reviews of this subject (1949, 

 1951), which contain many observations and interpretations that could not 

 be covered in the above presentation. 



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Light Factor I. Light Intensity 



A. Light Curves of Photosynthesis 



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