MANUFACTURE OF ORGANIC FOOD 51 



such green cells. These compounds, however, may 

 be appropriated by an animal or by a plant or animal 

 parasite. In all these cases the green plant, the 

 normal animal and the parasitic plant or animal 

 the organic compounds formed by their decomposition 

 when dead, form the food of saprophyta or saprozoa. 

 The final products of decomposition of all dead 

 organisms, as well as those resulting from the general 

 liberation of energy in all living organisms are, as 

 we shall see in the next chapter, carbon dioxide, 

 water, and inorganic salts, which replace the original 

 simple compounds absorbed by the green plant from 

 the soil and air. There is thus a constant circulation 

 of material from the inorganic, through the organic, 

 back once more to the inorganic world. We shall 

 see presently that there is also a circulation of 

 energy. 



