I OBSERVATIONS ON THE PATHOLOGY AND BACTERIOLOGY OF INFLUENZA.* BY LlEUT.-COLONEL E. D. W. GREIG, c.i.e., m.u., d.sc, i.m s., Officia'ing Director, Pasteur Institute oj India, Kasauli, Punjab. [Received for publication, August 25, 1920.] The observations recorded in this paper were made at Karachi amongst the Indian troops during the autumn of 1918 and beginning of 1919. Since it was written I have studied the literature, recently published in America, dealing with the results of the pathological mvestigations in the various military camps in connexion with Influenza and Pneumonia. Further, I have had the advantage of seeing the specimens and discussing the results with various investigators during my recent visit to the United States of America. My conversations with Professor W. G. MacCallum at the Pathological Department, Johns Hopkins Hospital, were particularly instructive, as he himself has made a very extensive study of the pathology of Influenza and Pneumonia. In his important monograph on the Pathology of the Pneumonia in the United States Army Camps during the winter of 1917-18 (') he clearly shows that the Pneumonia, associated with this great epidemic of Measles, had well-marked pathological features and was caused by a haemolytic streptococcus. In a further paper (2) he distinguishes the pathology of Pneumonia following Influenza from that associated with Measles. I also had the benefit of discussing with Professor S. Burt Wolbach, of Harvard, this question and seeing his specimens. He investigated the cases at Camp Devens, Mass. (•') ♦ I'lipi^r road at tlio SoHsioii pl^iiiljro, Commission Sanitaire des Pay« AUi&s, Paris, March 1910, as Dclogatc of the Oovornnient of India. ( 320 )
