The topics chosen for discussion represent the most common problems referred by family doctors to chest clinics. It was taken for granted that the reader will be familiar with the symptoms, signs, and natural history of respiratory diseases, so that the stress is on differential diagnosis and treatment. Tuberculosis once occupied nearly all the time of chest physicians. At present weeks go by without a single case presenting itself. There has been no comparable improvement in cancer of the lung, which remains one of the most intract- able problems. Asthma was seldom referred to out-patient...