The Jumna River at Agra, India, abounds with cholera germs. Some three miles below Agra the river is almost clear of them.
Last week Professor Felix d'Herelle—scarcely a name to the public but at Yale a tallish, dark, impatient, much respected protobiologist—gave the New York Academy of Medicine his explanation of such phenomena. Completely invisible parasites which he calls bacteriophage (TIME, May 28, 1923; Aug. 30, 1926) infest the microscopically visible germs and in some unknown way kill them. The microbes seem to dissolve into clear liquid....
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