Aug. 1909.] 



Soil Bacteriology. 



215 



TABLE V PLOT 5A. Stirred to a depth of eight inches. 



1. The large number of bacteria is^due to'manure. 



TABLE VI PLOT 6A. Stirred to a depth of ten inches. 



1. So many colonies that they could not be counted. 



TABLE VII PLOT B. Check plot, undisturbed. Preliminary experiment Marshall silt loam 

 ( U. S. Soil Survey) . Numbers indicate millions of bacteria per cubic centimeter. 



