He had first learned its seductions, as happens with the vast majority of Anglo-Saxon opium-eaters, through a medical prescription. An attack of inflamed cornea was treated with caustic applications, and the pain assuaged by internal doses of M'Munn's Elixir. When my friend came out of his dark room and bandages at the end of a month he had consumed twenty ounces of this preparation, whose probable distinction from the tincture known as laudanum I point out below in the note. [Footnote: Mr. Frank A. Schlitz has kindly made for me a special analysis of M'Munn's Elixir, which seems to prove that the process of its preparation amounts to more than the _denarcotization_ of opium, which is spoken of on the wrapper of each vial. As nearly as can be ascertained, M'Munn's Elixir is simply an aqueous infusion of opium--procured by the ordinary maceration--and preserved from decomposing by the subsequent addition of a small portion of alcohol. _Narcotin_ being absolutely insoluble in water is eliminated as the circular says. This fact alone would not account for the difference between its action and that of laudanum. This is explained by the fact that all the other alkaloids possess diverse rates of solubility in water, and exist in M'Munn's Elixir in very different relative proportions from those which they bear to each other in the alcoholic tincture called laudanum.] Here it may not be superfluous to say that the former preparation has all the essential properties of the latter, save certain of the constipatory and stupefying tendencies which, by a private process known to the assigns of the inventor, have been so masked or removed that it possesses in many cases an availableness which the practitioner can not despise, though compelled by the secrecy of its formula to rank it among quack medicines. The amount of it which my friend had taken during his month's eclipse represents an ounce of dry gum opium--in rough measurement a piece as large as a French billiard ball. I thus particularize because he had never previously been addicted to the drug; had inherited a sound constitution, and differed from any other fresh subject only in the intensity of his nervous temperament. I wish to emphasize the fact that the system of a mere neophyte, with nothing to neutralize the effects of the drug save the absorbency, so to speak, of the pain for which it was given, could so rapidly adapt itself to them as to demand an increase of the dose in such an alarming ratio. There are certain men to whom opium is as fire to tow, and my friend was one of these. On the first of October he sensibly perceived the trifling dose of fifty drops; on the first of November he was taking, without increased sensation, an ounce vial of "M'Munn" daily.