The studies of MacNeal[7] have shown that the first epidemic of influenza in the American Expeditionary Force in France occurred about April 15, 1918, at a rest camp near Bordeaux, reached its height on April 22 and ceased May 5. The disease was of a mild character with few complications. Localized epidemics were reported from various camps and hospitals during May and June, when the disease, MacNeal states, had become widespread in all sections of the American Expeditionary Force in France and in the French and British armies as well. Influenza had become epidemic in the Italian navy in the first two weeks of May. The belief that the disease was introduced from America, the author thinks, is “probably completely disproved by the fact that the epidemic was subsequently introduced into America in August and September and found there a most fertile soil for its spread.” This view is disproved by the demonstration that influenza had appeared as scattered epidemics in the army camps in March, 1918. There is little reason to doubt that influenza in the American Expeditionary Force was brought from America. At the end of August our commission was transferred from Camp Funston to Camp Pike, where throughout the history of the encampment pneumonia had been so prevalent that it had given the camp the rank of third in death rate from lobar pneumonia and fourth in death rate from bronchopneumonia among 32 camps established in this country. We arrived at Camp Pike September 5 and were stationed at the base hospital. Our work was facilitated by the hearty cooperation of the commanding officer, Major Morton R. Gibbons, who neglected no opportunity to promote the investigation. Our work was cordially aided by Major Carl R. Comstock, Director of the Medical Service, and by Major Henry H. Lissner, who later occupied this position. Work in the laboratory of the hospital received the valuable cooperation of Major Allen J. Smith, Director of the Laboratory, who placed at our disposal every facility available. Lieutenant James R. Davis, who was for a time in charge of the laboratory, effectively assisted the work. The commission consisted of the following officers: E. L. Opie, Colonel, M. R. C.; Allen W. Freeman, Major, M. C.; Francis G. Blake, Major, M. R. C., James C. Small, Lieutenant, M. C. and Thomas M. Rivers, Lieutenant, M. C. Major Freeman acted as epidemiologist and will publish a report upon the epidemiology of influenza and pneumonia at Camp Pike. On October 11 the laboratory car “Lister” in charge of Lieutenant Warren H. Butz was assigned to the commission. Lieutenant Harry D. Bailey was attached to the commission on October 14 and later assisted in its work. Valuable technical assistance was given by Sergeant Charles Behre, by Wm. E. Hoy, detailed from the Army Medical Museum, and by Thomas Payne. Study of the pathology of the lesions concerned was completed in the Pathological Laboratory of Washington University School of Medicine.