In January 1933 I obtained from the physician in charge permission to try roentgen therapy on a patient who was ill with lobar pneumonia. Unable to find any references in the literature to guide me in dosage, I used a technic which had proved valuable in the treatment of carbuncles. However, I increased the filtration and skin-target distance, so as to irradiate more homogeneously the large mass of tissue that is involved in a consolidated pulmonary lobe. Within a few hours after the treatment the patient was relieved of much of his distress, and within twenty-four hours his tem- perature dropped by crisis. He then pursued an uneventful and complete convalescence.
I have since used roentgen radiation in 104 cases of acute lobar pneumonia and in thirty cases of bronchopneumonia. Only five of the patients with lobar pneumonia died, and those with bronchopneumonia showed a reduction in mortality from 30