In these informal clinics considerable trouble is often caused by patients who arrive just before closing time, and expect to be examined. It is unwise to encourage this sort of tardiness, and a time limit should be set and strictly adhered to. All patients arriving after a specified hour should be directed to come another day, except such patients as are recognized by the nurse as worthy of exception from this rule. The most frequent offenders are not the patients who come from a distance, but those who live just around the corner. Unless punctuality be insisted upon, there will be endless overtime work for both doctor and nurse. =Tuberculin Classes.= At some of the large dispensaries, selected cases are formed into what are called Tuberculin Classes, and given special treatment. These patients are very carefully chosen, both from a financial as well as a physical standpoint, and intensive work, of a curative rather than a preventive nature, is put upon them. The treatment is carried out in their homes, where as nearly as possible sanatorium conditions are attained. Unruliness, or failure to comply with the regulations, means being dropped from the class. These patients live on a carefully planned routine, carried out under close supervision of both doctor and nurse. They report to the dispensary at certain intervals, once a week or so, and there tuberculin is administered, weights taken, and examinations made. Each patient keeps a little book containing a daily record of his doings, including the number of hours spent in the open-air, food—kind and amount, exercise, temperature, cough, and other symptoms. This book is presented at each visit to the dispensary, and the nurse also inspects it when she visits his home. These class patients often do extremely well, and excellent results are often obtained. Like all work of a curative nature, however,—in which the subjects are carefully selected and as carefully rejected,—it deals with so few people that it makes no real impression on the situation. The tuberculosis problem is, what can be done for a thousand patients, not for twenty. It is always possible to select a handful of cases and maintain them indefinitely at a high level of health, by a considerable outlay of money, energy, and time—an expenditure from which the community as a whole derives little benefit. To establish a tuberculin class is purely a physician’s affair, and all directions in regard to it come from the doctor himself.