During the six months from Oct. 12, 1917, to April 19, 1918, more than 1,000 chests have been examined roentgenologically in the roentgen-ray laboratory at Camp Devens, Mass. The findings in these cases have proved interesting enough to warrant summarization, and it is my purpose in this paper to give an account of the study. Some phases of the roentgen interpretation of pulmonary disorders here presented are not new, and the material presented is merely corroborative. Some of the phases, however, are practically new, and the ideas expressed are based on material previously not available. Where generalities seem to have been drawn without sufficient substantiation, I hope to establish and extend these conclusions by further and more detailed study.
The patients dealt with in this study are men between the ages of 21 and 30 — officers and enlisted men of the Army. A few rare cases of officers above