[vanderleck] bacteria OF FROZEN SOILS 



Experiment IV. 

 Table IVc. 

 Plot Sown to Grass for Three Years. 

 ■ Moisture Content of different depths. 



17 



Experiment V. 



Table Va. 



Cultivated Black Muck Soil. 



Average number of bacteria (in millions) per gram of soil at different depths. 



Sec. IV. Sig. 2 



