Distillation over, the alkaloids, glucosides, and their allies would next be naturally sought, since they can be extracted by alcoholic and ethereal solvents in such a manner as in no way to interfere with an _after_-search for metals. The metals are last in the list, because by suitable treatment, after all organic substances are destroyed, either by actual fire or powerful chemical agencies, even the volatile metals may be recovered. The metals are arranged very nearly in the same order as that in which they would be separated from a solution--viz., according to their behaviour to hydric and ammoniac sulphides. There are a few poisons, of course, such as the oxalates of the alkalies, which might be overlooked, unless sought for specially; but it is hoped that this is no valid objection to the arrangement suggested, which, in greater detail, is as follows:-- A.--POISONOUS GASES. 1. Carbon monoxide. 2. Chlorine. 3. Hydric sulphide. B.--ACIDS AND ALKALIES. 1. Sulphuric acid. 2. Hydrochloric acid. 3. Nitric acid. 4. Potash. 5. Soda. 6. Ammonia. 7. Neutral sodium, potassium, and ammonium salts. In nearly all cases of death from any of the above, the analyst, from the symptoms observed during life, from the surrounding circumstances, and from the pathological appearances and evident chemical reactions of the fluids submitted, is put at once on the right track, and has no difficulty in obtaining decided results. C.--POISONOUS SUBSTANCES CAPABLE OF BEING SEPARATED BY DISTILLATION FROM EITHER NEUTRAL OR ACID LIQUIDS. 1. Hydrocarbons. 2. Camphor. 3. Alcohols. 4. Amyl-nitrite. 5. Chloroform and other anæsthetics. 6. Carbon disulphide. 7. Carbolic acid. 8. Nitro-benzene. 9. Prussic acid. 10. Phosphorus. The volatile alkaloids, which may also be readily distilled by strongly alkalising the fluid, because they admit of a rather different mode of treatment, are not included in this class. D.--ALKALOIDS AND POISONOUS VEGETABLE PRINCIPLES SEPARATED FOR THE MOST PART BY ALCOHOLIC SOLVENTS. DIVISION I.--VEGETABLE ALKALOIDS. 1. Liquid volatile alkaloids, alkaloids of hemlock, nicotine, piturie, sparteine, aniline. 2. The opium group of alkaloids. 3. The strychnine or tetanic group of alkaloids--strychnine, brucine, igasurine. 4. The aconite group of alkaloids. 5. The mydriatic group of alkaloids--atropine, hyoscyamine, solanin, cytisine. 6. The alkaloids of the veratrines. 7. Physostigmine. 8. Pilocarpine. 9. Taxine. 10. Curarine. 11. Colchicin. 12. Muscarine and the active principles of certain fungi.