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HARVARD UNIVERSITY SCHOOL OF PUBLIC HEALTH 55 VAN DYKE STREET DEPARTMENT OF PHYSIOLOGY BOSTON, MASSACHUSETTS July 14, 1924. Mr. Arthur Roeder, United States Radium Corporation, 30 Church Street, New York City. C you Dear Mr. Roeder : Thanks ever so much for the minnows. I am sending them to my brother, and perhaps he will give us a report upon them. Anyhow, I know he will be interested in making a trial. Sincerely yours, Ceil N. Du. her Cecil K. Drinker, M.D.