Consider for a moment what this lowered consumption of proteid food really amounts to, as compared with ordinary usage and the so-called dietary standards. The latter call for at least 118 grams of proteid or albuminous food daily, of which 105 grams should be absorbable, in order to maintain the body in a condition of nitrogen equilibrium, and in a state of physical vigor and general tone. This would mean a daily metabolism and excretion of at least 16 grams of nitrogen. Our subject, however, excreted per day, during nine months, only 5.69 grams of nitrogen, which means a metabolism of 35.6 grams of proteid; _i. e._, about one-third the amount ordinarily deemed necessary to meet man’s requirement for proteid food. But was our subject in nitrogen equilibrium on this small amount of proteid food? We answer yes, as the following balance period shows: Output. Nitrogen in Nitrogen through Weight of Excrement Food. Kidneys. (dry). March 20 6.989 grams. 5.91 grams. 3.6 grams. 21 6.621 5.52 .. 22 6.082 5.94 12.0 23 6.793 5.61 18.5 24 5.057 4.31 23.0 25 6.966 5.39 16.9 ----- ---- ---- 74.0 grams contain 6.42% N. 38.508 32.68 + 4.75 grams nitrogen. ------ -------------------------- 38.508 grams nitrogen. 37.43 grams nitrogen. Nitrogen balance for six days = +1.078 grams. Nitrogen balance per day = +0.179 gram. In this particular period of six days, the body was really gaining a little nitrogen, _i. e._, storing away a small amount of proteid for future use, although it may be granted that the amount was too small to have any special significance. During this period, the average daily intake of nitrogen was 6.4 grams, equal to 40 grams of proteid food. The average daily output of nitrogen through kidneys and excrement was 6.24 grams. The average daily output of metabolized nitrogen, through the kidneys, was 5.44 grams, corresponding to the breaking down of 34 grams of proteid material. Further, it should be stated that the total calorific value of the daily food during this period was less than 2000 calories. Let me add now a final balance period taken at the close of the nine months’ trial: