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The procedure adopted consists in placing 1 ml. of an acidified amnioniacal liquor on an acidified Celite column and elution with cyclohexane to obtain all the monohydric phenols in one band, except phenol which follows as a separate band. The dihydric phenols are then eluted separately or in groups of isomers by the addition of butanol in successively increasing amounts to the cyclohexane eluent. The monohydric phenols are separated on a second Celite column impregnated with sodium silicate solution by elution with cyclohexane. Amounts of all the compounds are determined directly in the eluates by ultra‐violet spectrophotometry.

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