Blyth’s Classification (after Pammel).
A.—Poisons causing death immediately or in a few minutes: Prussic acid, cyanides, oxalic acid, and occasionally strychnine.
B.—Irritant Poisons, with symptoms chiefly pain, vomiting, and purging: Ergot, digitalis, colchicum, yew, laburnum.
C.—Irritant and Narcotic Poisons, with symptoms of an irritant nature, with more or less cerebral indications: Oxalic acid or oxalates.
D.—Poisons more especially affecting the Nervous System:
1. Narcotics.—Symptoms: insensibility, which may be preceded by more or less cerebral excitement. Opium.
2. Deliriants.—Delirium, for the most part, a prominent symptom: Belladonna, hyoscyamus, stramonium, and other Solanaceæ, Lolium temulentum, Oenanthe crocata, poisonous fungi.
3. Convulsives.—Almost every poison has been known to produce convulsive effects, but the only true convulsive poisons are the alkaloids of the strychnine class.
4. Complex Nervous Phenomena.—Aconite, digitalis.