THE CHARACTERISTIC CURVE 



24T 



It may be noted here that a somewhat similar relation 

 was found between the increased photosynthetic evolution of 

 oxygen and the increasing intensity of light (p. 34). 



Fig. 56. Curve showing the Change of Volume of 1 Grm. of Water 

 at different temperatures 



The expansion-curve of water given in fig. 56 shows that 

 it is practically straight in the middle range ; limiting 

 conditions are, however, imposed towards the extreme ends 

 where the liquid becomes converted into a solid at the lower, 

 and into steam at the upper, end. 



Photosynthesis being a function of light, of C0 2 -con- 

 centration, and of temperature, we study the effect of 



