In the 1870s Louis Pasteur and Robert Koch showed that microscopic germs cause diseases like anthrax, rabies, tuberculosis. Sixty years later and with vastly improved microscopes, bacteriologists are unable to see any germ positively responsible for smallpox, measles, infantile paralysis, the common cold. That invisible, specific contagia cause these diseases and many an-other is certain. Medical scientists call those submicroscopic substances viruses. But they do not know their true nature, and hence cannot scientifically prevent common colds or infantile paralysis (see p. 36).
Last winter Chemist Wendell Meredith Stanley of the Rockefeller...
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