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i6o BOTANICAL GAZETTE [FEBRUARY suspect, ABERSON, in reinvestigating the question,'5 sought only to determine the concentration of the H ions to which the solvent action must be due. By using the delicate electrometric method of NERNST he has found that the concentration of the H ions corresponds to that in water (8.5 to 0 . 5 X IO-8 in root excretions at I6-200, as against 7. 7X IO-8 in water at i80). He then proceeds to show that the H ions present in such a concentrated solution of H2C03 asdoi:10.1086/330142 fatcat:meuo5tklzzcyzchhledkas5sv4