formed thereby rapidly disappear, but if the sample is adulterated the bubbles continue some time before they burst. Pure olive oil is pale and a greenish yellow. If equal volumes of strong nitric acid (this may be obtained from any chemist) and olive oil are mixed together and shaken in a flask the resulting product has a greenish or orange tinge which remains unchanged after standing for ten minutes. But if cotton-seed oil is present, the mixture is reddish in colour, and becomes brown or black on standing. Olive oil is slightly laxative, and therefore useful to sufferers from constipation. It is also an excellent vermifuge. Olive oil has been used with great success in the treatment of gall stones. A Dr. Rosenberg reported that of twenty-one cases treated by "the ingestion of a considerable quantity of olive oil, only two failed
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