HYDRATION, PHOTOSYNTHESIS AND RESPIRATION 233 



and respiration are causally connected with permanent differences in 

 hydration of cells of the assiniilatory tissue of different parts of the leaf- 

 blade. A quantitative comparison of relationships between the above values 

 of photosynthesis and respiration rates is quite compHcated. It must be 

 borne in mind, however, that the locahsation of sites for which the 

 intensity of photosynthesis and respiration was determined was somewhat 

 different from methodological reasons (see Fig. i). 



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