. Absorption of vapors and gases by soils . od. Moisturecontent. Bays. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. .167 27. 80 25. 40 •

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. Absorption of vapors and gases by soils . od. Moisturecontent. Bays. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. .167 27. 80 25. 40 • .10 , . .09 .12 DRY SOIL. .1 i .11 . .10 .10 97. 0 ; . 12 • ! • — — :::;.:::::::::::::: •. T/mC IN DAYS Fig. 1.—Curves for quartz flour, showing effect of humidity upon rate of evaporation. ABSORPTION OF WATER VAPOR. 17 Table III.—Change in moisture content of Podunh fine sandy loam soil exposed toatmospheres of different humidity at 2iP C. MOIST SOIL. Strength of sulphuric acid, with equivalent partial pressure of water vapor. Water alone. per cent per cent per cent per cent = mm. = mm. = 12 mm. = mm. Period. Moisturecontent. Period. Moisturecontent. Period. Moisturecontent. Period. Moisturecontent. Period. Moisturecontent. Days. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. Days. Per cent. .167 29. 20 27 50 29. 5 20

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