Abstract
Bacteriologic and microscopic examination of the blood has given no constant results. Nevertheless the injection of a few drops of blood invariably causes death in two or three days. Indeed, the mere insertion of a needle into the blood suffices to carry over sufficient virus to cause death. Fatal infection by way of the stomach follows the mixing of a few drops of blood with the food, and the clearest serum is as infectious as the whole blood. By inoculating a series of animals, one from another, Centanni shows that it does not concern a toxin or enzyme, but a viable virus capable of endless reproduction. He further found that the infectious agent passes through Berkefeld and Chamberland (F) filters in virulent form. Maggiora and Valenti find that the Chamberland filter K under a pressure of 11/2 atmospheres holds back the infectious agent. Lode and Gruber made the
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