The patient, an adult, white male, 42 years of age, was well until three days before admission to the Montreal General Hospital. On rising in the morning, he had vomited, soon suffered from headache, and had chills, warm flushes and sweats, cough, and expectoration. The temperature ranged between 101.4° and 104.4°, and signs of consolidation appeared at the left base on the day following admission. The patient's condition became steadily worse and he died 38 hours after admission to the hospital, on the sixth day of the illness. At autopsy, the entire upper lobe of the right lung and large