. Anaesthetics : their uses and administration. , under ether spray it is difficult tosee and secure blood-vessels, and painful to do this whenthe analgesia has passed off. Unless care be taken, theskin may be so much frozen that a slough like that of frost-bite will follow. * Richardson recommended anhydrous ether, sp. gr. 0720. mixed with an equalpart of hydride of amyl (rhigolene). 44^ ANESTHETICS. Various agents have been employed which produce a certaindegree of analgesia by freezing the tissues upon which theyare sprayed. We may mention methyl chloride and ethylchloride. Coryl is a name
. Anaesthetics : their uses and administration. , under ether spray it is difficult tosee and secure blood-vessels, and painful to do this whenthe analgesia has passed off. Unless care be taken, theskin may be so much frozen that a slough like that of frost-bite will follow. * Richardson recommended anhydrous ether, sp. gr. 0720. mixed with an equalpart of hydride of amyl (rhigolene). 44^ ANESTHETICS. Various agents have been employed which produce a certaindegree of analgesia by freezing the tissues upon which theyare sprayed. We may mention methyl chloride and ethylchloride. Coryl is a name given by G. Joubert to ethylchloride mixed with methyl chloride so as to lower itsboiling point from io° C. to o° C. ; Anesthyle is the namegiven by Dr. Bengue to a mixture of i part methyl chlorideto 5 ethyl chloride—its use is similar to that of coryl ;Rhigolene, a product of the distillation of petroleum, wasintroduced by Richardson, who employed it with ether in hisatomising spray. These substances are kept in tubes with specially con-. FiG. 84.—Ether spray. structed stop-cocks, which allow of spraying over the area tobe frozen. A large number of drugs have been proposed aslocal analgesics, but as few have special advantages no furthermention need be made of them here. Faradic currents directed for some minutes through anarea of skin or mucous membrane produce some degree ofanalgesia. At one time this method was in vogue amongdentists ; it has now fallen into disuse. A recent attempt hasbeen made to revive this plan, improved apparatus being em-ployed, but the success achieved seems to have been so slightas to make it hardly necessary to particularise its features. CHAPTER XII. MEDICO-LEGAL ASPECTS OFTHE ADMINISTRATION OF ANESTHETICS. Legality of Patients. In the present state of the law there is no restriction imposedupon any one with regard to the giving of anaesthetics. Afurther anomaly exists with respect to such powerful drugs ascocaine. Their use
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