Roentgen Photography

A systematic study of the transparency of different substances to the X rays has been wade by Maurice Meslans, whose paper appears in Comptes Rendus. He found that carbonaceous organic substances containing only carbon, hydrogen, oxygen and nitrogen were relatively transparent; that sulphur, iodine and inorganic substances generally were opaque, and that the introduction into the molecule of an organic compound of one or more atoms of sulphur...