There are three classes of persons interested in the correct diagnosis of the nontuberculous form of pulmonary disease, the physician who is the responsible adviser in the case, the friends of the patient and the patient himself. It is true that this community of interest obtains in practically all diseases, but in tuberculosis there is the question of sanatorium treatment, a protracted illness and much time lost from one's occupation in order to effect a cure, to say nothing of other possible results, so that more than ordinary interest attaches to cases in which the question of tuberculosis is raised. The answer is not infrequently difficult.
With this group of three, another may be mentioned, the sanatorium physician to whom these patients with tuberculosis are sent. Reports from various sanatoriums show that patients with nontuberculous pulmonary diseases are constantly being sent to these institutions and constitute from 25 to 50