Abstract
The scientific selection of operative therapy in pulmonary suppuration is still in a state of development. Standardization is often a poor principle when applied to any phase of surgical work except the technic, and possibly even here it is particularly out of place in dealing with conditions the pathologic anatomy and biologic status of which show such fine distinctions as do those encountered in suppurative infections of the lungs. The frequent complication by disease of other structures, particularly of the pleura, adds still another problem to this perplexing question. I need not discuss an exact classification of the various types of suppuration, although the blood-borne and the air-borne sources—the one beginning in the parenchyma of the lung and the other beginning in the bronchial tree and its ramifications—may roughly be recognized. To these may be added infection from contiguous structures. When changes related to the stage of the process
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