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UNIVERSITY OF MINNESOTA SCHOOL OF CHEMISTRY DEC 26 1930 MINNEAPOLIS December 24, 1930 OFFICE OF THE DEAN Dr. H. H. Barker United States Radium Corporation 535 Pearl Street New York City Dear Barker: Many thanks for your letter of December 20 in regard to Dr. Moore. I am very much disappointed to get such discour- aging news, and I hope that there has been some improvement since then. I will appreciate it if you will keep me informed of his condition from time to time. I presume that the reaction resulting from the first ra- dium treatment was due to the destruction of abnormal cells. I am informed that normal brain cells are very resistant to radiation. Sincerely yours, A. C Lind S. C. Lind, Director. scl:en