Document 7R8Mpn6Eob8aaOdL23Y7eyKyE

September 14, 1946 l!r. Kempton.Dunn, Treasurer Atner loan Brake Shoe Company New York Office Ret Sideroois Replying to your letter of September 12 oonoSrnlng the artlole by Drs* Pendergast end Leopold on the subject of benign pneumoooniosls which appeared in the journal of the A.M.A., X have a oopy of this article in the Medical Journal on file here. This represents, along with the articles by Sander and Enser, about all that we have on the subject. I did notice on the same page of the Industrial Hygiene Digest a rather interesting note on an article by E. E* Harding from the British Journal of Industrial Medicine for January 1946 which dealt with some experimental work on rats. This oonsisted of intra tracheal injections of rouge (ferrio oxide). This substance produced rather atypical stippling or fine nodulation of the lungs with no detectable fibrosis as a result of the presence of iron oxioe for some eight months. This would tend to support the evidence we already have that Iron oxide may produce the results noted without actual fibrosis. This work will be along the lines of our proposed experiment with Dr. Gardner. I will discuss this more fully with you when you come to Chicago. t LIH/mr L. E. Hamlin, K. D. Medioal Director SPNY 000441