778 



PRINCIPLES OF SOIL MICROBIOLOGY 



non-spore forming bacteria, sarcina, actinomyces and fungi commonly 

 associated with processes of decomposition of organic matter. How- 



Fig. 73. Influence of temperature upon nitrification in the soil (from Pan- 

 ganiban). 



ever, nitrifying, denitrifying, nitrogen-fixing, cellulose decomposing 

 and pathogenic bacteria were absent. A careful study of the flora 

 of the soil of northern Greenland and of the island of Disko near Cape 



