European bacteriologists have been aware for some years of the important researches of Dr. F. d'Herelle, of the Pasteur Institute, Paris, but it was not until an English translation of his book* was recently published that American medical men became aroused to its significance.

It is well known to miscroscopists that bacteria are sometimes destroyed—apparently dissolved—in the blood stream. The process is called " autolysis" and the unknown causal agent a " lysin." D'Herelle's theory is simply that this lytic agent is an ultra -microscopic organism...

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