ee OyAe i © 4 ys vi . . THE HOSPITAL OF THE ROCKEFELLER FOR MEDICAL RESEARCH 66TH STREET AND YORK NEW AVENUE, YORK ms CASLE ADDRESS | ROKBTITIUTE. INSTITUTE 21. N. \ Y. lay 13, 1949 Dr, Jonn 2. Sowers, Director of Biology ond “edicine Atomic EnergyBonnission Tashineton 25,°D. ©, Dear Dr. Bowers: Your letter of lay 4 reached ne only yesterday. ‘We sn-ll endeavor to have a report reedy for vou-br the 2Sth, It will necessarily be tentative Beccouse of the clhort tine aveilable for ~-reraration. Yours sincerely, Donald D>. Van Slyke ae 1 50048926 ho an ‘ag ie a : oS neo el fermi { + bd wh +} aba aa ed wh Was Le ye