Several techniques useful in the preparation of spores, pollen, hystrichospherids, and similar acid-insoluble microfossils are described. These include oxidation treatments to remove unwanted organic matter; 4 aids in the mechanical separation of organic and mineral matter; and 2 methods for making permanent slides using cover-glass smears. A feature of all of these techniques is that the residues are retained in a water-base medium throughout processing.

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