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Properties of colloidal soil materials-Continued. Electrical charge 27 Hydrogen-ion concentration 31 Relations between the properties of soil colloids 32 Relation between properties and chemical composition 36 Character of colloids 42 Summary 43 Literature cited 44 to 12 inches. Six miles west of Fallon* Churchill County, Nev. Sharkey clay. Depth to 4 inches. Near Valley Park, Issaquena County, Miss. Marshall silt loam. Depth to 14 inches. Two miles west of Mynard, Case County, Nebr. Sassafras silt loam. Depth 8 to 22 inches. Near Easton, Talbot County, Md. Huntington loam. Depth to 8 inches. One mile west of Seneca, Montgomery County, Md. Norfolk fine sandy loam. Depth 12 to 36 inches. One-fourth mile south of Scottsville, Wayne County, N. C. Susquehanna clay. Depth about 4 feet. Takoma Park, Montgomery County, Md. Aragon soil. Depth 1314 to 17 feet. Turrialba, Costa Rica.

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