PLATE 3 



A. — Soybean plants inoculated with Bacillus radicicola contrasted with uninoculated 

 plants grown 55 days in soil held approximately at the temperatures indicated. The 

 pots are grouped according to temperature, with the control on the left and the inocu- 

 lated pot on the right in each set. 



B. — Nodules from 9 soybean plants grown 55 days in soil held at approximately the 

 temperatures indicated. 



