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STAPHYLOCOCCAL ANTIHEMOLYSIN IN OSTEOMYELITISmembranes through the adsorption of a large amount of protein, is impossible to determine. Summary.The virus of equine encephalomyelitis, both the Eastern and the Western strains, was found to pass collodion membranes with an average pore diameter of 66 mp, but was completely held back by those of 60 mp. The results indicate that this virus has the same filtration end-point, and consequently the same particle size, as that of St. Louis encephalitis, which was shown by Bauer, Fite, and Webster,' and Elford and Perdrau' to be 20 to 3Omp.

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