There are two temperaments in respect to this drug. With persons whom opium violently constricts, or in whom it excites nausea, there is little danger that its use will degenerate into a habit. Those, however, over whose nerves it spreads only a delightful calm, whose feelings it tranquillizes, and in whom it produces an habitual state of reverie, are those who should be upon their guard lest the drug to which in suffering they owe so much should become in time the direst of curses. Persons of the first description need little caution, for they are rarely injured by opium. Those of the latter class, who have already become enslaved by the habit, will find many things in these pages that are in harmony with their own experience; other things they will doubtless find of which they have had no experience. Many of the particular effects of opium differ according to the different constitutions of those who use it. In De Quincey it exhibited its power in gorgeous dreams in consequence of some special tendency in that direction in De Quincey's temperament, and not because dreaming is by any means an invariable attendant upon opium-eating. Different races also seem to be differently affected by its use. It seldom, perhaps never, intoxicates the European; it seems habitually to intoxicate the Oriental. It does not generally distort the person of the English or American opium-eater; in the East it is represented as frequently producing this effect. It is doubtful whether a sufficient number of cases of excess in opium-eating or of recovery from the habit have yet been recorded, or whether such as have been recorded have been so collated as to warrant a positive statement as to all the phenomena attendant upon its use or its abandonment. A competent medical man, uniting a thorough knowledge of his profession with educated habits of generalizing specific facts under such laws--affecting the nervous, digestive, or secretory system--as are recognized by medical science, might render good service to humanity by teaching us properly to discriminate in such cases between what is uniform and what is accidental. In the absence, however, of such instruction, these imperfect, and in some cases fragmentary, records of the experience of opium-eaters are given, chiefly in the language of the sufferers themselves, that the opium-eating reader may compare case with case, and deduce from such comparison the lesson of the entire practicability of his own release from what has been the burden and the curse of his existence. The entire object of the compilation will have been attained, if the narratives given in these pages shall be found to serve the double purpose of indicating to the beginner in opium-eating the hazardous path he is treading, and of awakening in the confirmed victim of the habit the hope that he may be released from the frightful thraldom which has so long held him, infirm in body, imbecile in will,