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The writer is especially grateful to Professor D. R. HOAGLAND for making the facilities of the Division of Plant Nutrition available for the work and for his interest and suggestions, to Mr. P. R. STOUT for suggesting the method and preparing the K2SiO3 used in experiment 4, and to Drs. MAX GARDNER and C. M. TOMPKINS for suggestions concerning the control of damping-off of the seedlings in sand. This work was done while on sabbatic leave from Cornell University.