PLATE XL 



Fig. I. — Root systems of two mature corn plants. These plants stood 6 feet high, 

 and the grain was in the glazed condition. Seed planted on May 23, 1914. Root 

 systems obtained on August 25, 1914. Greatest lateral extent of the roots, 3 feet. , 

 Greatest depth of root penetration, 6 feet. The lower portion of the root cage is not 

 shovvTi here, but the roots which penetrated the sixth foot are shown in a horizontal 

 position at the bottom of the cage. 



Fig. 2. — Root system of a com plant at the tim.e of "shooting." Height of plant, 

 5 feet 6 inches. Seed planted on May 23, 1914. Root system obtained on August i, 

 1915. Greatest depth of root penetration, 4 feet. Greatest lateral extent of the roots, 

 2 feet 6 inches. 



