Illustrated, 170 pages. Small 8vo, original green wrappers; spine split and book is in two sections. Paris, 1904. A good copy. An early discussion on radium and radioactivity, especially in its medical applications, i.e., in the treatment of venereal diseases and cancer, its influence on the human skin, and its dangers.- Library stamp on title, on the last text-page, and on the page with the printer's address.