Project Nos. 2 (2-7, 11, 13, 15, 17, 19). Report on sub-project no. 2-7 -- Determination of water and salt requirements for jungle operations : 2-11 -- Influence of high temperatures upon the efficiency of personnel : 2-13 -- Effect of training upon the efficiency of performance at high temperatures : 2-15 -- Study of the effects of drugs and accessory food factors on efficiency of personnel at high temperatures : 2-17 -- Study of the physiologic effects of high temperatures : 2-19 -- Study of efficiency of performance and rate of deterioration under conditions of water limitation