. Diseases of the ear : a text-book for practitioners and students of medicine. lead, cocaine, menthol, oil of eucalyptus, dilute carbolicacid, veratrine, and, in fact, all the drugs of the pharma-copoeia which have a real or imagined analgesic local must be remembered that the absorption of any remedyfrom the unbroken skin takes place verv slowly and produces,therefore, when applied to the cutis, almost no effect asidefrom that due to the evaporation of the liquid, with the con-sequent production of a certain amount of cold. The smallamount of benefit to be derived from such applica
. Diseases of the ear : a text-book for practitioners and students of medicine. lead, cocaine, menthol, oil of eucalyptus, dilute carbolicacid, veratrine, and, in fact, all the drugs of the pharma-copoeia which have a real or imagined analgesic local must be remembered that the absorption of any remedyfrom the unbroken skin takes place verv slowly and produces,therefore, when applied to the cutis, almost no effect asidefrom that due to the evaporation of the liquid, with the con-sequent production of a certain amount of cold. The smallamount of benefit to be derived from such applications ismore than counterbalanced, in my opinion, by the soddencondition of the epidermis, which is produced by the reten-tion of the liquid in the canal, making subsequent instru-mental manipulations much more difficult, and masking to avery great degree the local appearance upon speculum ex-amination. No remedies should be employed locally unless the epi-dermis has already been exfoliated over a considerable sur-face, a condition with which we not unfrequently meet as the. Fig The Leiter coil. 230 CIRCUMSCRIBED EXTERNAL OTITIS. result of a previous chronic inflammation. When this condi-tion is present, any of the before-mentioned drugs, eithersingly or in combination, may be beneficial. They are mostconveniently used in the form of gelatin bougies, as advocatedby Gruber* under the name of amygdale aurium. They con-sist essentially of small conical suppositories of gelatin, thedrug being incorporated in their substance; the heat of thecanal dissolves the gelatin, and the drug is thus broughtdirectly into contact with the walls of the canal and evendistributed over the inflamed surface. Previous to their in-sertion the canal should be thoroughly cleansed with a mildantiseptic solution, after which the suppository is inserted andthe orifice of the meatus closed by a small pledget of method is certainly preferable to the use of oleaginouspreparations, and may to an ex
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