150 LIGHT, VEGETATION AND CHLOROPHYLL 



result of photosynthesis, showing how it is measured and the 

 various factors which influence it. 



We shall then be able, in a final and less technical chapter, 

 to consider the place of chlorophyll in the world and its role 

 in relation to ourselves. We shall see how much we depend 

 on it, since the energy which it collects, and by which we 

 benefit, enables us to occupy, close to it, our place in the sun. 



