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Article
January 16, 1892

A NEW METHOD OF INDUCING LOCAL ANÆSTHESIA.

JAMA. 1892;XVIII(3):83-84. doi:10.1001/jama.1892.02411070023005

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Abstract

Dr. Leonard Corning has described in the New York Medical Journal, December 26,1891, a novel procedure by which he obtains a protracted loss of sensation, without freezing the tissues. He uses a double hypodermic syringe with a single needle. One barrel of this syringe contains a solution of muriate of cocaine, while the other has a pure, non-irritant oil, preferably the oil of theobroma, or "cacao butter," as it is commonly named. The strength of the cocaine solution should be two or three parts of the salt to one hundred parts of water. The oil of theobroma in the larger barrel of the syringe is maintained in a fluid state by occasionally dipping the syringe into water of about 110° F. The cocaine is first thrown into the tissues that are to be made insensitive, then, without removing the needle, the cacao oil is made to follow along the same

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