26 



FUNDAMENTALS OF AGRICULTURE. 



This food then diffuses slowly to all the living cells 

 of the plant, there to be used up as described above, 

 or to be made use of in making new protoplasm, or 



E9 



PATHWAYS OF WATER AND FOOD MATERIALS. 



in building the cell walls. This manufacturing of 

 food takes place only in the light. The substances 

 out of which it is made are water, which the plants get 

 from the ground if they are not water plants, and 



