Radiographs, usually spoken of as skiagraphs, are not, as the latter name would imply, mere shadowgraphs or silhouettes; they are, rather, the result of the superimposition of semishadows or half-tones as they are called in photography, whose size, shape and intensity depend on the size, shape and molecular density of the object to be radiographed. But such pictures have never been interpreted as perspectives or "plastic" reproductions, and successful attempts have never been made to obtain "relief" effects except by means of stereoscopic reproductions.
Béla Alexander, a country practitioner hitherto unknown, living in an obscure part of Hungary, first published1 a method of obtaining "plastic x-ray" photographs. It is through the efforts of one of us (Rosenberg) that the substance of this and other contributions of Alexander and other Hungarian writers in the various Hungarian medical journals has been collected and abstracted. The method as they give it