Letters Sent to Huck Mackay, July 12, 1926

M stail lo mottustiA 10° dosidu2 lo .omaM July 12th, 1926. Dr. Hugh Macicay, 215 MeIntrye Block, Winnipeg, Man. Canada. Dear Dr. Nackay:- Enclosed herewith you will find an article entitled "Radio Active Naterial an Industrial Hasard?", by Dr. Frederick B. Flinn, Ph. D., Assistant Professor of Physiology in Industrial Hygiene, College of Physiciens and Surgeons, Columbia University, which traats of the so called "gadivm necrosis" or radium poisoning cases. The investigation by Dr. Flinn, which formed the basis of his article, has been by far the most thorough and far reaching vork undertaken on this subject. This article will appear in one of the early issues of the Journal of the Americen Medical Association. While it seems that the charge of #radium poisoning" caused the death of several girls (which charge was widely advertised through the press a fow months ago) is entirely unfounded, we naturally hesitate - without further investigation - to malce the broad statement that radium in luminous material is unharmful, although ve believe this to be the dase. Therefore in order to be on the safe side, we caution you, if you have not already done 30, to order your operators not to point their application brushes betwem their lips. Thenever we receive any further authentic information on the subject, we shall be glad to pasa it along to you. Yourn very truly. President. CBLEE-OB Enclosure (1)