or kingdom they may be derived, it has become the custom to arrange the several poisons according to the most characteristic effect they produce on the animal economy, and to divide them into the IRRITANT POISONS, the NARCOTIC POISONS, and the NARCOTIC-ACRID POISONS, thus embracing all deleterious substances under one or other of the above classes. IRRITANT POISONS Are those that excite inflammation in some part, or the whole of the alimentary canal. Nitric Acid Muriatic Acid Sulphuric Acid Phosphorus Sulphur Chlorine Iodine Hydriodate of Potass Bromine Oxalic Acid The fixed Alkalis Nitre Alkaline and Earthy Chlorides Lime Ammonia and its Salts Alkaline Sulphurets Baryta Euphorbia Castor Oil seeds Croton Bryony Colocynth Elaterium Ranunculus Anemone Clematis Mezereon Cuckoo-Pint Gamboge Savin Cattha Poisonous Fish Compounds of Arsenic Compounds of Mercury Ditto of Antimony Ditto of Tin, Zinc, Silver, Bismuth, and Chrome Compounds of Lead Ditto of Copper Venomous Serpents and Insects Daffodil Jalap Cantharides Decayed Animal Matter Mechanical Irritants. NARCOTIC POISONS Are those poisons that produce an immediate and continued disorder of the nervous system. Opium Lactuca Solanum Nitric Oxide Gas Chlorine Gas Ammoniacal Gas Sulphuretted Hydrogen Carbonic Acid Cyanogen Hyoscyamus Hydrocyanic Acid, and all vegetables producing it, as bitter almonds, cherry laurel, peach, and mountain ash, carbonic oxide, and oxygen. NARCOTIC-ACRID POISONS. The poisons of this class produce a double action, that of a local irritation, and a secondary, or after effect on the nervous system. Nightshade Hemlock Tobacco Water Hemlock Monkshood Squills Ipecacuanha Meadow Saffron Foxglove Nux Vomica Camphor Cocculus Indicus Upas Secale Cornutum Darnel Grass Alcohol Ether Thom-Apple Fool’s-Parsley Hellebore, Black Hellebore, White Strychnia False Angustura Poisonous Fungi Mouldy Bread Seeds of the Laburnum, and some empyreumatic oils.