A powerful protoplasmic poison. It destroys life by producing paralysis of the heart and respiration ; preceded by vertigo, roaring in the ears, profuse sweat, contracted pupils and collapse. It sometimes produces convulsions. The blood is disorganized, had haemoglobinuria results (black urine). It produces an inflammation of mucous membrane, characterized by hard, shriveled membranous patches of exudation. Applied to the skin, anaesthesia results. The stomach is sometimes paralyzed, so that one can not vomit.