equilateral triangle. The site for the "E+" program added to the overall program in the Fall of 1950 was the northern apex. The existing airstrip, perpendicular to the east shore of the island and 1,500 feet south of the northern apex, was resurfaced and lengthened, The camp was located some distance south of the airstrip and on the east shore So as to catch the prevailing breeze. The tent quarters were placed in staggered rows parallel to the shore with the other camp facilities grouped farther inland. After the decision was made to use this site for the Military Structures program, the capacity of the camp was approximately doubled, This enlargement was required to accommodate the increase in personnel necessitated by the acceleration of the construction program. The additional tent quarters were placed in staggered rows inland from and parallel to the earlier tent installation. The enlarged population necessitated increasing the other camp facilities. An additional mess hall building was placed adjacent and parallel to the original, with a covered passage connecting the two. The recreation building was enlarged to include a post office and post exchange. The first aid station was moved out of the combined fire and first aid building and an infirmary replaced it. The quarters vacated became the timekeeper's office. The open air movie theater was enlarged beyond the original design. The other buildings (recreation tent, day room, and power plant) remained unchanged. Bogallua. The selection of a fourth experiment site had been one of the tasks assigned the Reconnaissance party. After investigation, the group recommended Bogallua, one of the islands west of Engebi, as the most suitable site, provided use could be made of the sand spit at the west end of the island. The main problem involved in the use of the sand spit was that of determining its stability. The age and ex- tent of the vegetation on the spit indicated that it was stable, and studies of aerial photographs taken six months and eighteen months before corroborated the opinion that the spit was stable. After conferences among representatives of Holmes & Narver, J-Division, and the AEC Engineering and Construction Division at Los Alamos, Bogallua was selected as the fourth experiment island. The planning of installations on Bogallua was based upon the fact that the time and nature of the experiment to be conducted there would require a less elaborate camp than those on other experiment islands. The camp was designed to house fewer than 50 men in tents, and provided for only a pit latrine and an open shower and lavatory slab. Storage and repair facilities were to be housed in tents. The weapons tower power plant were to be similar to those on other experiment islands. No movie theatre or airstrip was to be provided. On December 2, 1949, after the site layout had been approved and after some construction work had been done, a break was observed in the sand spit. On December 10, 1949, a second break was observed; and shortly thereafter the sand spit disintegrated almost entirely. An attempt was made to stabilize at least a portion of the spit, but this 5-53