Cancer of the Lung and Other Intrathoracic Tumours.

When Adler wrote his monograph on "Primary Malignant Growths of the Lungs and Bronchi" in 1912, cancer of the lung was looked on by most physicians as an interesting rarity, almost as difficult of diagnosis as of treatment. Since that time the picture has changed in many respects, but most remarkably in regard to the frequency of primary, malignant pulmonary disease. Since 1918, the literature of the entire world has been flooded with articles on the subject, indicating a world wide increase in the frequency of this condition. Few authors are found to doubt that this increase is real and not one of the common false trails of medical statistics. Although admittedly the development of roentgenology has disclosed vastly more cases than were recognized ante mortem in earlier days, the routine autopsy observations throughout the world have shown that a vastly larger proportion of dead bodies examined during the past