A. Barley firown in container with waxseals at (i-incii iiilcrvals. 



B. Same with upper jjortion of container removed. 



C. Wax seal at depth of 2 feet (left) showing the penetration of the 



their alnmdance under field conditions. Fertilized soil at 2. 

 with copiously branched roots. 



D. Arrangement of containers in greenhouse experiment, 1920-21 



seal bv roots and 

 5 feet deijth filled 



