It may arouse wonder that another contribution to this much discussed subject should be offered so long after the subsidence of the pandemic form of this disease in view of the excellent reports on the pathology of the disease already presented by numerous investigators, including Goodpasture and Burnett,1Goodpasture,2Winternitz,3Klotz,4MacCallum,5and Opie and associates.6Excellent material, however, was obtained at Camp Devens during the epidemic, and although Wolbach7has published a preliminary report on the pathology and bacteriology of these cases, the more complete study of this material has only just been made. As this study has brought out some interesting points which have not been emphasized by other workers, and as it is possible from this material to form a definite opinion in regard to the course of the lesions in the different organs and their relation to various bacteria present, it seems advisable to publish the