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APoisons may exert a twofold action. This may be either local, or remote, or both local and remote.
The local action of a poison is usually one of corrosion, inflammation, or a direct effect upon the sensory or motor nerves.
The remote actions of poisons are usually of a specific character, though some writers group the remote effects of poisons under two heads, and speak of the common and the specific remote effects of a poison.. The local action of a poison of the corrosive class is usually so well marked and obvious that the fact of the administration of a poison of this class is generally unmistakable.
The symptoms produced by the mineral acids and the alkalies are almost altogether referable to local action; but some corrosive poisons, such as carbolic acid, produce, besides a local action, remote and specific constitutional effects.
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