THE SOIL. 



65 



roots suited for the entrance and activity of those bacteria 

 are apparently the leguminous plants, like the bean, 

 berseem, lupin, lentil, earthnut and fenugreek. After 

 entering the root of a suitable plant the bacteria increase 



FIG. 3. BERSEEM ROOTS (AFTER FIFTH CUTTING) SHOWING "XODULES. " 



in number and the tissue in which they reside swells 

 forming little nodules. 



The accompanying illustration shows the little nodules 

 on the roots of berseem after the fifth cutting of the crop. 



