The preparation of plant and other acid-insoluble microfossils for microscope study commonly involves the mounting of chemically processed residues on glass slides. Mounting media more commonly comprise a single layer of Canada balsam, diaphane, glycerin jelly, or other material mixed with the residue between the slide and the cover slip. These may discolor, may be too fragile, or may result in the occurrence of specimens at many different level "Cellosize," a powdered hydroxyethyl cellulose (HEC), used in two-layered mounting, acts both as a dispersing agent and as a thin film-former which adheres firmly to both glass and plastic. HEC is water soluble so that aqueous residues do not need to be dehydrated. Several varieties are available for obtaining a range from low to high viscosity. HEC is reported to be clear, colorless, and insensitive to light. Basic phases in the maceration process of sample to obtain microfloras and associated acid-insoluble microfossils are described.

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