CHAPTER XIV.. Absorption by Soils of Solids From Solutions. Absorption

ABSORPTION BY SOILS OF SOLIDS FROM SOLUTIONS. ABSORPTION OF GASES, AIR OF SOILS, 267.—Absorption of Solids, 267.—Desalination, 267.—Decolorization, 267.—Complexity of Soil-Action, Physical and Chemical, 268.—“Purifying” Action of Soils on Gases and Liquids, 269.—Waste of Fertilizers, 269.—Variation of Absorptive Power, 270.—Generalities Regarding Chemical Action and Exchange, 270.—Drain Waters, 271.—Distinctions not Absolute, 272.—Absorption or Condensation of Gases by the Soil, 272.—Proof of Presence of Carbonic and Ammonia Gases in Soils, 273.—Absorption of Gases by Dry Soils. Figure, 274.—Composition of Gases Absorbed by Various Bodies from the Air. Table, 275.—Discussion of Table, 277.—The Air of Soils, 279.—Empty Space in Dry Soils, 279.—Functions of Air in Soils, 279.—Insufficient and Excessive Aeration, 280.—Composition of the Free Air of Soils, 280.—Carbonic Dioxid vs. Oxygen, 281.—Relation to Bacterial and Fungous Activity, 281.—Putrefactive Processes, 282.