Recently radium, its emanations and the products of its decomposition or breaking-down have been coming more and more into consideration as therapeutic agents, not only in skin diseases and diseases with cutaneous manifestations, but also in various "internal diseases" of the most diversified nature, especially carcinoma and the arthritides, and as this interest seems distinctly on the increase and there seems to be a real hope that in some, at least, of these diseases a cure may be obtained by this means, it would seem of interest to know the exact effect of certain salts or products of radium on those substances of such vital importance to the body metabolism — the ferments.
As a slight contribution to this subject we have carried on a series of experiments on the effects of Radium-Lead, Radium D, E and F from radio-active ores, and Radium D, obtained from emanations, on certain of