The importance of the examination of the chest in children was forced on our attention in the Children's Department at the Massachusetts General Hospital because of the large number of patients brought to us by school nurses and friendly visitors to determine whether or not tuberculosis was present. It has been our custom in doubtful cases in addition to the customary physical examination to do a von Pirquet skin reaction and to have a roentgenogram made of the chest. We have recorded also the weights and tried to secure the morning and evening temperature. The same methods of examination have been employed in other patients having symptoms pointing to disease of the lungs. We have tabulated the results of our studies in 100 cases (all of these patients have been examined by one of us, and nearly all of them by both of us). The course of events has been