What we wish to bring to attention is not so much the theoretical aspect of the Roentgen diagnosis of gastroduodenal lesions, or a complete review of what others have done in this field, but just what we have found of practical value in our study of this part of the tract. We are frank to confess that there has been, as in all pioneer work, considerable criticism as to the value of this method. Undoubtedly many errors have been committed, and much discredit has thereby been cast on this procedure. This state of affairs has largely been brought about by several conditions.
In the first place, the pioneers in this work developed a technic which relied largely, if not exclusively, on fluoroscopic examination. By this means they worked out a system of diagnosis which may be called "diagnosis by symptom-complexes"; by this, we mean basing the diagnosis chiefly on the