Abstract
Although abscess, gangrene and bronchiectasis belong to the rarer lung diseases, their study is acquiring a greater interest and importance, because we are becoming more familiar with their causation and also because of the increasing possibility of curing them by operative procedures. In the textbook description of these diseases, they are usually accorded individual notice as though these three were distinct and separate conditions. In the attempt to carry out this classification in the individual case, however, the clinician at once encounters difficulties. In a large percentage of these cases—which may comprehensively be described as cases of "lung suppuration"—abscess formation, bronchiectasis and gangrene coexist, and it is not at all an easy matter to assign the predominating rôle to any one of them. In order to make clear some of the more salient points in the pathology and etiology of these affections, it may be of value to analyze a

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