PHYSIOLOGICAL STUDIES 



45 



SO high that practically all the enzyme is combined and of 

 studying the effect of carbon dioxide concentration with an 



so 



O 

 so 



HO 



18,000 lux 



100 200 300 M^/0^ 



Concentration of carbon dioxide 



FIG. 4.2. The relationship between rate of photosynthesis and con- 

 centration of carbon dioxide at different Ught intensities in 

 Fontinalis antipyretica. (After Harder.) 



intensity of illumination so great that further increase does 

 not appreciably affect the rate. Under these conditions we 

 should expect the relationship between rate of photosynthesis 



