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Summary .Reference is made to the difficulty that exists in describing the bronchial branches in terms used in comparative anatomy. The apparent inconstancy of the tertiary bronchi is deemed to be a cause of the failure of text‐books to standardize the anatomy of the bronchial tree. The work of Kramer and Glass is elaborated and a separate area, the snbapical, of the lower lobe of the lung is described. It has a bronchial supply hitherto unrecorded. The bronchi of this area are located, and their homologues shown in mammalia other than the human being. The recognition of this bronchus and its variants allows the anatomy of the bronchial tree to be described with the surety of ordinary anatomical description. methods are described of making metal casts of the bronchial tree, of showing the distribution of the bronchi by inflation, and of filling single bronchi by means of lipiodol. A method is described of instilling into the lung antiseptics in isotonic solution in large amounts that are absorbed by the lymphatics. A plea is made for the recognition of bronchiectasis in early life, and suggestions are offered for its preventive treatment.

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