Dimethyl hydantoin formaldehyde resin dissolved in water or in 70 ml ethyl slcohol+30 ml wster is put forward as a solution suitsble for the mounting of insects, smsll crustacea, &c. Its chief advantage over other water-soluble resins is its high solubility in water, its excellent adhesion to glass, its low viscosity even in high per-centage solutions, snd its hsrdness on drying.

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