II. BLOOD POISONS.

1. Blood poisons interfering with the circulation in a purely physical manner, such as peroxide of hydrogen, ricine, abrine.

2. Poisons which have the property of dissolving the red blood corpuscle, such as the saponins.

3. Poisons which, with or without primary solution of the red blood corpuscles, produce in the blood methæmoglobin; such as potassic chlorate, hydrazine, nitrobenzene, aniline, picric acid, carbon disulphide.

4. Poisons having a peculiar action on the colouring matter of the blood, or on its decomposition products, such as hydric sulphide, hydric cyanide, and the cyanides and carbon monoxide.

III. POISONS WHICH KILL WITHOUT THE PRODUCTION OF COARSE ANATOMICAL CHANGE.

1. Poisons affecting the cerebro-spinal system; such as chloroform, ether, nitrous oxide, alcohol, chloral, cocaine, atropine, morphine, nicotine, coniine, aconitine, strychnine, curarine, and others.

2. Heart Poisons; such as, digitalis, helleborin, muscarine.

IV. POISONOUS PRODUCTS OF TISSUE CHANGE.

1. Poisonous albumin.