TESTING CULTURES OF NODULE-FORMING BACTERIA. D 
ton wool. The leguminous plants grow well, and if the culture used 
for inoculating is in proper condition normal nodules are soon formed. 
By this procedure it has been possible to distinguish sharply be- 
tween the inoculating power of apparently identical strains of bac- 
Fic. 1.—Jars for testing the inoculating power of different strains of Baciilus radicicola. 
In the jar at the right are inoculated garden-pea plants, while at the left are uninocu- 
lated ones, each 8 weeks old. 
teria, and in future all stock cultures intended for distribution by the 
Office of Soil-Bacteriology and Plant-Nutrition Investigations to 
farmers and other experimenters in the United States will be tested 
in this manner. 
[Cir. 120] 
