In an experiment reported in 1889 by Carl Voit[56], on a vegetarian weighing about 57 kilos, it was found that with a purely vegetable diet the subject was able, for a few days at least, to maintain his body in essentially a condition of nitrogen equilibrium on a daily diet containing 8.4 grams of nitrogen, corresponding to 52.5 grams of proteid. In addition, there was a large consumption of starchy food with some fat. Klemperer,[57] experimenting with two young men, having a body-weight of 64 and 65.5 kilos, respectively, was able to keep them in a condition of nitrogenous equilibrium for a period of eight days on 4.38 grams and 3.58 grams of nitrogen per day. The diet, however, had a large fuel value, 5020 calories per day, and contained in addition to the small amount of proteid, 264 grams of fat, 470 grams of carbohydrate, and 172 grams of alcohol. Breisacher,[58] in an experiment on himself, using a mixed diet composed of 67.8 grams of proteid, 494.2 grams of carbohydrate, and 60.5 grams of fat per day, with a total fuel value of 2866 calories, observed a daily excretion of nitrogen during thirty days of 8.23 grams. This corresponds to a metabolism of 51.4 grams of proteid, thus showing that the 67 grams of food-proteid taken was quite sufficient to maintain nitrogen equilibrium for the above length of time. [56] Carl Voit: Ueber die Kost eines Vegetariers. Zeitschrift für Biologie, Band 25, p. 232. [57] Klemperer: Untersuchungen über Stoffwechsel und Ernährung in Krankheiten. Zeitschrift für klin. Medizin, Band 16, p. 550. [58] L. Breisacher: Ueber die Grösse des Eiweissbedarfs beim Menschen. Deutsche med. Wochenschrift. 1891. No. 48.