MODIFICATION OF AN IMPROVED ANAEROBE JAR.
In the filtrates of typhus-infected tissues of guinea pigs can be occasionally found a substance which produces in these animals thermic reactions, lesions characteristic of experimental typhus, and, still less frequently, inimunity to later injections of active virus. The general indications are that this substance is not a living organism.
Brown
J H
JH
Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.