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acid actinium action activity actual AFFECTING PHOTOGRAPHIC PLATES alpha rays aluminium foil angioma apparatus atomic weight autunites barium Becquerel beta rays bismuth calcium cancer commercial COMPARATIVE SKIAGRAPHS SHOWING crystal cure discharge discovery of radium disease effect of radium electricity electrometer electroscope emanation experiments extracted fact fluorescence forms gamma rays gases GRAMMES OF URANITE Guarda investigation ionizing chamber known laboratory layer lodes Madame Curie ment metal methods millimetres MINERALS AS AFFECTING mines nium obtained Paris particles peculiar penetrate PHOSPHATE phosphorescent physical pitchblende polonium Portugal present Professor properties purely QUADRANT ELECTROMETER quantity of radium radiation radio radio-active bodies RADIO-ACTIVE ESTIMATION radio-active substances radium bromide radium chloride Radium Institute radium rays radium salt radium treatment residue Rontgen rays scientists Sir Frederick Treves solution source of radium suffered sulphates supply surgeons thickness thorium tissue treated tube tumour U(U04)2 EQUIVALENT ulcer URANITE URANIUM uranium content valuable Wickham X-rays