101. NODULES, OR TUBERCLES, ON THE ROOTS OF SOY BEAN 



In these live the bacteria that may take nitrogen from the soil air, and turn it over to 

 the plant. Only "leguminous" plants as clover, pea, cowpea can do this 



102. COWPEAS ON " WORN-OUT" COTTON FIELD 



Note the tiny gullies; the fine soil has been mostly washed away. The cowpeas, when 

 plowed under, will give body to this thin soil and enrich it 



