The tube A (12 mm.) projects up through the stopper and to the 5. The intake C should be 4 mm. or as small as possible and still give Note.-All calibrations are outside measurements. bottom of the bottle. sufficient flow. Its height determines the height of the water-table. F. C. CLAPP. DIVISION OF SOILS, MINNESOTA AGRICULTURAL EXPERIMENT STATION. SI. PAUL, MINNESOTA. [CONTRIBUTION FROM THE CHEMICAL LABORATORY OF THE UNNERSITY OF CALIFORNIA.
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