─────────────────────────────────────────────────────────────────────── CLASS I. POISONS WHICH ACT PRIMARILY, THROUGH THE MEDIUM OF THE NERVES, WITHOUT BEING ABSORBED; OR EXCITING LOCAL INFLAMMATION. _Order 1._ _By which the functions of the Nervous System are suspended, or destroyed._ (_Death by Suffocation from paralysis of the Respiratory muscles._) Alcohol. Aconite. Oil of Tobacco. Essential Oil of Almonds.[220] Camphor.[220] Opium?[220] Salts of Lead? Croton Tiglium.[221] _Order 2._ _By which the heart is rendered insensible to the Stimulus of the Blood._ (_Death by Syncope._) Infusion of Tobacco. Upas Antiar. CLASS II. POISONS WHICH, BY ENTERING THE CIRCULATION, ACT THROUGH THAT MEDIUM, WITH DIFFERENT DEGREES OF ENERGY, ON THE HEART, BRAIN, AND ALIMENTARY CANAL. (_Death in many forms._) Arsenic. Emetic Tartar. Muriate of Baryta. Hellebore. Savine. Meadow Saffron. Squill. Opium?[221] Lettuce. Henbane. Prussic Acid. Deadly Nightshade.[221] Hemlock. Camphor.[221] Coculus Indicus. CLASS III. POISONS WHICH, THROUGH THE MEDIUM OF THE CIRCULATION, EXPEND THEIR ENERGIES UPON THE SPINAL MARROW, WITHOUT DIRECTLY INVOLVING THE FUNCTIONS OF THE BRAIN. (_Death by Tetanic Convulsions._) Nux Vomica—and the whole tribe of _Strychnus_. CLASS IV. POISONS WHICH PRODUCE A DIRECT LOCAL ACTION ON THE MUCOUS MEMBRANE OF THE ALIMENTARY CANAL. (_Death by Gangrene._)