This, the second volume issued by the chair of roentgenology of the Kirov Postgraduate Institute in Leningrad, is a collection of papers dealing predominantly with problems of experimental character. The subjects investigated are those of experimental vasography, roentgenologic study of the physiology of respiration and the circulation, the study of the diagnosis and the course of the diseases of the gastrointestinal tract, and, in particular, of ulcerative disease, as well as the study of the biologic effects of the roentgen rays. The roentgenologic approach to physiologic problems opens up possibilities heretofore but superficially investigated. The shift from investigations of a purely morphologic character to those of the functional activities of the human organism was made possible thanks to the recent advances in the roentgenologic methods and technic. The papers present much that should be of interest to the scientific roentgenologist. They are well illustrated and supplemented with exhaustive bibliographic references.