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acetylated oil acid contains aldehyde alkaline liquid alkaloids aqueous distillate atmospheric pressure BOILING TEMPERATURE borneol butyric aldehyde camphor caproic caprylic acid carvacrol cent alcohol cent of hydrogen cent of silver cent solution Chem cineol color crystallization from alcohol dipentene dissolved elementary analysis ester filtered flask fraction boiling geraniol grams Identification Jour ketone linalool melting point menthone methyl alcohol mixture nitrosochloride obtained odor suggestive oil boiling oil contains oil distilled OIL OF PYCNANTHEMUM oil which separated oily optical rotation original oil oxidation oxime pennyroyal percentage Pharm phenol physical constants physical properties pinene portion potassium hydroxide presence pulegone Pycnanthemum Incanum recrystallized redistilled removed residue resorcin solution salicylic acid samples of oil saponification saponification number semicarbazide hydrochloride semicarbazone shaken silver salt small amount sodium bisulphite solution of sodium species specific gravity steam distillation substance terpene terpineol tion tube University of Wisconsin volatile oil volume washed with water water bath yield