Part I I. Studies on the Condiiions of Life of Poliomyelitis Virus outside the Human Organism.From the precediag it seems to be obvious that the presence of the poliomyelitis virus during an epidemic can without any great difficulty be demonstrated in sewagean observation which in our opinion indicates a massive, if also temporary, occurrence of this agent in the said medium. Our epidcmiological observation.s, made in connexion with the establishment of the virus content of Stockholm sewage in the autumn of 1939, gave US cause to assume that the virus, after leaving the human organism and passing into the sewage, afterwards in some way or other has un,dergone a multiplication. But this process of life can only be realised by the presence of an organism, in which this infectious agent, being of an ultra virus nature, finds good conditions for its growth. Where is one now to look for this vector, and of what kind is it? Does it live above the surface of the sewage or is it perhaps to he f0un.d within this vehicle itself?When Levaditi became acquainted with our fin.d of poliomyelitis virus in Stockholm sewage, and commented upon it in Academie de Medecine he put forward the suggestion that there must be LOC. citat.

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