Abstract
IF a section of a dry sodium montmorillonite film is placed in a solution of sodium chloride it will swell parallel to the c-axis, the swelling increasing as the salt concentration is reduced, until at a sufficiently low concentration (about N/100) complete dispersion occurs. This swelling has now been observed under a microscope. Fractions less than 2µ from samples of Wyoming and Dakota bentonites were washed with N sodium chloride and then freed from chloride by dialysis through a cellulose casing, keeping the pH. of the dialysate about 7.0 by adding dilute sodium hydroxide. An aliquot of the suspended clay was then slowly dried to form an orientated flake about 0.01 cm. thick.
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