188 Report of the Department of Bacteriology of the 



BACTERIA 1913 19W 



ttAft. APR. MAY 



noiSTURt 



40 

 30 



20 



10 



FROZEN 



fftOZLN 



TEhPCRATOftC 



15 e 

 10" 

 5° 



0' 



-10' 

 -15 



Graph VI. — Bacterial Counts in Aerated Soil, Pot Experiment, 



1913-14. 



Bacteria in millions per gram; moisture content in percentage, dry basis; 

 temperature in degrees Centigrade, average per week. 



