PLATE LXXX 

 Effect of various substances and combmations on the growth of cowpeas: 



Fig. I. — Effect of adding lime, phosphate rock, dextrose and lime, and phosphate 

 rock, dextrose, and lime to the soil. (Table XV.) 



Fig. 2. — Effect of adding nothing, lime, phosphate rock, and phosphate rock and 

 lime to the soil. (Table XV.) 



