=Autopsy 467.=—P. C., white, aged twenty-five, a farmer from Missouri, had been in military service three months. Illness began September 27, thirty days before death, and the patient was admitted the day following onset with headache, backache and cough. Pneumonia with consolidation in the right lower lobe was recognized on the sixth day of illness. On the ninth day 500 c.c. of fluid were withdrawn from the right pleural cavity; there were cyanosis and dyspnea. On the eleventh day 700 c.c. of fluid were withdrawn. On the twelfth day thoracotomy was performed and 100 c.c. of greenish fluid were removed. The patient’s condition improved for a time, but on the twenty-sixth day 1,000 c.c. of straw colored fluid were aspirated from the left pleural cavity and on the twenty-eighth day the same amount of seropurulent fluid was withdrawn. =Anatomic Diagnosis.=—Healing abscess of right lower lobe communicating with the pleural cavity; acute purulent pleurisy with closed thoracotomy wound on the right side; purulent pleurisy on the left side; acute bronchopneumonia with lobular consolidation in the left lung; purulent bronchitis; bronchiectasis with formation of spherical bronchiectatic cavities; acute splenic tumor. At the base of the right chest is a closed thoracotomy wound 2 cm. in length; the right pleural cavity contains 200 c.c. of thick creamy pus and the cavity is lined by a thick tough membrane. The left pleural cavity contains 800 c.c. of white purulent fluid thinner than that on the right side. The right lung is compressed into the posterior and inner part of the chest. The upper lobe is pink and air containing; the posterior and lower part of the lower lobe is red and atelectatic, and fibrous septa are more conspicuous than elsewhere. The pleura of the external surface near the basal edge, in an area 2 cm. across, is depressed and yellowish gray in color. In the center of this area is a small opening communicating with a pocket 0.5 cm. across within the substance of the lung. In the lower lobe beneath the interlobular surface are two spherical bronchiectatic cavities, each about 1.5 cm. across, with smooth lining in continuity with two branches of the same bronchus of medium size. Bacteriologic examination showed the presence of S. hemolyticus in the blood of the heart. No growth was obtained from the left lung; the left pleural cavity contained hemolytic streptococci and S. aureus, the latter in small number. S. hemolyticus and B. influenzæ were grown from the left main bronchus.