Several years ago we began a systematic examination of the heart and lungs of infants and children in our out-patient services in the Howard and Polyclinic Hospitals, with a view to confirming certain observations which we had made, some of which had not been sufficiently emphasized in the literature, and others of which were at variance with the results reported.
CONDITIONS IN THE LUNGS.
Our observations relate exclusively to normal or functional conditions. In relation to the lungs, they are three in number: First, an area of impaired resonance under the left clavicle. Second, the area of transmission of the bronchial type of breathing as heard over the root of the lung. Third, the influence of position on the percussion note in infants. An Area of Impaired Resonance Under the LeftClavicle.—This sign was first noted accidentally by one of us in a child convalescent from bronchopneumonia. In this instance, owing to the absence of all other signs