An easily constructed device permits the flat-face embedding of four specimens in epoxy resins. Either pieces of tissue or cells grown on cover slips can be used. After polymerization, the flat-surfaced capsules may be examined under high magnification for selection of areas to be sectioned. Specimens difficult to orient can be cut out and re-embedded in the proper position. The use of thick-walled BEEM capsules and the clamping action afforded by four screws prevent leakage of the resin.
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Harley G. Sheffield (1965) studied this question.
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