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Read before the Public Health Engineering Section of the American Public Health Association at the Sixty-sixth Annual Meeting in New York, N. Y., October 6, 1937.
†
This study is supported by a grant from the Commonwealth Fund to the University of Pennsylvania for investigations on air-borne infection with the laboratories in the Department of Bacteriology, the Children's Hospital, and the Henry Phipps Institute for the Study, Treatment and Prevention of Tuberculosis.