One feature in the diet compelled by the circumstances of the case also needs to be referred to, namely, the necessity of keeping the men thoroughly satisfied, so that there should be no feeling of hunger, no craving for food. With a person interested in the experiment and desirous of ascertaining the effect of a low nitrogen intake, there would naturally be a willingness to endure, if necessary, for a time some personal discomfort; but with this detail of the United States Army it could not be expected that the men would remain satisfied if they were compelled to undergo the pangs of hunger even for a day or two. Consequently, it was necessary in prescribing the daily diet to see that the quantity of the food was such as to completely satisfy the appetite. This necessitated the use of considerable bulky food of low fuel, and low nitrogen, value. In this way only was it feasible to reduce the nitrogen intake, as well as the fuel value of the food, to the desired level. Practically during the entire six months’ period, with the possible exception of a few days, the men were given sufficient food to completely satisfy their appetites. Throughout the entire period of the experiment, the men all manifested a keen appetite and utilized their food to good advantage, with establishment of the nitrogen metabolism indicated by the foregoing results. Still confining our attention to the average results regarding nitrogen excretion, we may ask the question, what was the excretion of metabolized nitrogen per kilo of body-weight in the different individuals? This is easily calculated and the data are shown in the following table, in which the figures standing for body-weight are either the data for the month of April, 1904, or else the average between the October and April weights, as in those cases where the body-weight fell off during the experiment. Average daily Metabolized Nitrogen Body-weight. Output of Nitrogen. per kilo November-April. Body-weight. kilos grams gram Fritz 74.0 7.84 0.106 Oakman 64.0 7.42 0.116 Bates 68.0 8.08 0.118 Morris 59.0 7.03 0.119 Broyles 60.0 7.26 0.120 Henderson 71.0 8.91 0.125 Loewenthal 59.0 7.38 0.125 Cohn 63.5 8.05 0.126 Steltz 53.0 7.13 0.134 Sliney 60.0 8.39 0.138 Coffman 58.0 8.17 0.140 Davis 58.0 8.61 0.148 Zooman 55.0 8.25 0.150