Feb. 29 10.466 grams. 6.22 grams. Mar. 1 7.825 7.44 2 8.487 4.00 71 3 8.750 7.05 28 5 10.483 8.71 49 6 10.265 4.78 44 ------ ------ ------ 192 grams contain 6.61% N. = 12.691 gr. -1.813[36] 56.276 38.20 + = 10.878 grm. N. ------ ---------------------- 56.276 grams nitrogen. 49.078 grams nitrogen. Nitrogen balance for six days = +7.198 grams. Nitrogen balance per day = +1.199 grams. THIRD NITROGEN BALANCE. The last of March, a third nitrogen balance was tried on a slightly lowered nitrogen intake and with a slight increase in the fuel value of the daily food. In this period of five days, March 28 to April 1, the nitrogen taken in per day averaged 8.62 grams, or nearly one gram per day less than in the preceding period. The fuel value of the food averaged 2840 calories per day, or about 300 calories more than in the preceding period. The daily diet, with its content of nitrogen, etc., is detailed for each day under Oakman. Any deviation from this diet in the cases of the other men is indicated on the accompanying balance-sheets. The results obtained in this balance period indicate that the lowest level had been practically reached, at least under the conditions of body-weight, food, and work prevailing. Cohn, Fritz, and Broyles showed a distinct positive balance. Steltz and Loewenthal were practically in equilibrium, the deviation being within the limits of error. The remaining six men showed a minus balance, although in no case was it very marked. It is interesting to note in this connection that the average daily output of nitrogen through the urine for this five days’ period (Oakman’s case) amounted to 7.04 grams, being 0.2 gram less per day than in the preceding period. This figure for nitrogen in the urine means the metabolism daily of 44 grams of proteid.