Bui. 149, Bureau of Chemistry, U. S. Oept. of Agriculture. 



PLATE VIII. 



Fig. a. Comparison of entire pan of wheat plants grown in (1) distilled water; (2) potassium 

 sulphate; and (3) potassium sulphate + calcium carbonate. 



Fig. b. Clover plants grown with wheat in (1) distilled water; (2) distilled water + calcium 

 carbonate; (3) potassium sulphate; (4) potassium sulphate + calcium carbonate. 



