Thoroughly washed elementary bodies of vaccinia were inactivated by sonic vibrations with a frequency of about 8900 cycles per second; the inactivation was not accompanied by a disruption of the bodies. Adventitious substances, notably protein, prevented or hindered the inactivation. There is some evidence that oxidation might have played a rôle in the inactivation.
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Copyright, 1937, by The Rockefeller Institute for Medical Research New York