The test drug-proving of the "O. O. & L. Society". A reproving of belladonna, being an experimental study of the pathogenic action of that drug upon the healthy human organism, conducted under the auspices of the American Homœopathic, Ophthalmological, Otological, and Laryngological Society, with the indorsement and co-operation of the American Institute of Homœopathy and various state and local societies