31 



been made by Chester, and is shown in the table below taken 

 from Bulletin 66, Delaware College Agricultural Experiment 

 Station. 



Gains of nitrogen in nitrogen-poor media by certain nitrogen-assimilat- 

 ing organisms. 



In warm, well-aerated soils containing sugars, starches, and 

 cellulose from decaying grasses and other vegetation, and well 

 supplied with carbonate of lime or other bases and mineral foods, 

 these bacteria fix considerable atmospheric nitrogen. The 

 amount of course, depends upon the nature and amount of carbo- 



* The figures in this column are about 100 less than those given in the bulletin 

 ed and show the actual per cent, of gain in nitrogen. 



