A technique has been devised by which fine, hydrodynamically heterogenous grains may be mounted on a microscope slide in such a way that their distribution on the slide is random. The grains are settled from a well-mixed suspension onto the microscope slide where they are held in place by a thin film of gelatin. This technique allows the investigator to use any part of the slide as a representative subsample, and obviates the need for repeated splitting of samples and the counting of a very large number of grains.

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