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Published in the Journal of American Medical Association, Volume 73, Number 6, Aug. 9, 1919. Pages 396 – 401. Read before the Joint meeting of the section on Pharmacology and Therapeutics, the section on Pathology and Physiology, and the section on Preventative Medicine and Public Health at the Seventieth Annual Session of the American Medical Association, Atlantic City, New Jersey. June 1919.This is members-only content. Please log in above to access the full PDF.