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as guides, prepare three fresh portions of I O grams each and add lime-water as before, escept that the amount added to a dish differs from that added to another by I or 2 cc. Dry, take up with 100 cc. of water, allow to stand, dram off, and treat exactlJas hefore. The smallest amount of !ime-water which gives the cliaracteristic pink color is taken as the acidity equivalent of the soil. Each cubic centimeter of standard lime-Jvater is equivalent to an acidity of 0.01 per cent. expressed asdoi:10.1021/ja01996a006 fatcat:bpd7ult6krc6dgttemshguqx2y