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The amount of ethylene glycol retained by a clay is used as an index of interlayer swelling. Potassium montmorillonites after drying at 100° C show markedly lower glycol retention than do calcium and hydrogen montmorillonites. X‐ray diffraction data indicate that these potassium clays are in part unsolvated between silicate layers, and in part solvated with two layers of ethylene glycol.

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This paper reports the occurrence of mica leptyls as the principal constituent and wavellite a minor constituent of the clay fraction from Gainesville loamy fine sand of Florida. The mineralological compositions of clay fraction from seven soils of the lower Gulf Coastal Plain are compared. Methods used for identification are differential thermal analysis, X‐ray diffraction, surface area measurements, chemical analysis, and observation under the electron microscope. Leptyls of mica comprise 60 to 80% of the mineralogical composition of the clay fraction of Gainesville loamy fine sand. Four to 7% of the clay fraction consists of wavellite. Ten to 15% of the clay fraction is kaolinite with some quartz present in the 2‐ to 0.2‐µ fraction. The clay fraction from the seven soils of the lower Gulf Coastal Plain is predominantly kaolin or kaolingibbsite mixtures.