This article is essentially on the lines of the paper read at the German Congress of Radiologists ("Deutscher Röntgenkongress") at Münster. It deals with the visual interpretation of the contents of roentgenographic films of widely different origin. On going deeper into the subject, it was found that by examining the pictures for structural contents as far as the image permits, it becomes possible to obtain a survey of all the usually prepared x-ray photographs--a viewpoint which has so far been greatly neglected. Knowledge of the conditions of observation and of the prerequisites is promoted at the same time. The need for radiation protection is re-emphasized from a new angle.