SI AND H EXPERIMENTATION, 21 MAY 1951 (ROOM 20, BUILDING 13)

.7. TO: Files Subject: SI and H Experimentation, 21 May 1951 (Room 20, Building 13) On Monday, 21 May 1951, 11111111111% an ond c ed ex- erime ts in SI .4 H betw4 en Y2, PM An :3 M Wit s volunteer subjects. - Since this was their initial experiment and test, they were very thoroughly briefed on the nature of the work, the methods, and, to a certain extent, the ultimate aims of the D problem...