The old vegetable neurotics : hemlock, opium, belladonna and henbane; their physiological action and therapeutical use, alone and in combination being the Gulstonian Lectures of 1868, extended and including a complete examination of the active constituents of opium / by John Harley.

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Credit: The old vegetable neurotics : hemlock, opium, belladonna and henbane; their physiological action and therapeutical use, alone and in combination being the Gulstonian Lectures of 1868, extended and including a complete examination of the active constituents of opium / by John Harley. Source: Wellcome Collection.