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P R O O F Silence is an OK of this Proof FRO M THE BOSTON The section in which this is to appear goes to press Thediral and Surgiral and must be received by us before JOURNAL that date to insure any corrections you wish made Return to JAMAICA PRINTING COMPANY BOSTON 30, MASS. JAMAICA PRINTING COMPANY RADIUM Radium salts of the highest purity for use in surgery and gynecology. Deliveries on the basis of U. S. Bureau of Standards measurement. We guarantee that the radiations of our Radium salts are due solely to Radium element and its own decomposition products. Our Medical Staff will give instruction in the physics and therapeutics of Radium. "The National Radium Bank" instituted by this corporation. We manufacture improved applicators, screens and other special equipment made with alloys of our own development, also apparatus for the purification and con- centration of Radium emanation. Information on request. THE RADIO CHEMICAL CORPORATION 56-58 Pine Street, New York Plants and Laboratories: Orange, N. y. Telephone, John 3141 Mines: Colorado, Utah