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Benzoic acid, as it exists in the resin, is the natural production of the plant from which the resin is derived.
Dr. Gregory considers the following process for obtaining benzoic acid the most productive.
If the solution of the salts of this acid is too dilute and warm, none or only a portion of the benzoic acid will be separated.
Then procure a small quantity of benzoic acid, which exists in the shape of snowy crystals.
These crystals, except for a slight sweetness of taste, correspond in characters and tests to benzoic acid.
