182 



Btjlletin 80 



Fig. 7. — Bean cultures grown in soils containing copper as precipitated 

 carbonate, from none to 1.5 per cent Cu. 



TABLE XIX 



Copper Carbonate Series (1907), Corn 



roots 



40.00 



152.00 



728.00 



745.00 



Containing traces of copper, .0025%. 



Fig. 8. — Corn cultures grown in soils containing copper as precipitated car- 

 bonate, from none to .2 per cent Cu. 



