VOLUME 2 2, NO. 4, APRIL 1950 567 cupric ions. Methods were also found whereby these metals could be determined in the presence of the other ions. A future pubiica-(ion will discuss the industrial applications of this reagent.

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Laboratory methods are presented for determining the amounts of boron that must be leached from soils to reduce their soluble boron concentrations to nontoxic levels. One method consists of an extraction of a soil sample with a 0.01M mannitol −0.01M CaCl2 solution. The second method consists of dialysis of a soil sample against a boron‐specific resin in the presence of 0.01M CaCl2 solution. Some of the soils studied were observed to “regenerate” toxic levels of soluble boron following reclamation.

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