Proteid, absorption of, in dogs on low proteid diet, 233, 262 absorption of cleavage products, 47 amounts of food required to supply needs of body for, 272 as food, 3 as fuel, 6 as glycogen former, 130 as source of energy, 122, 123, 124, 129 as source of energy, in fasting, 81 availability of, 12 body-weight on diet low in, 170–175, 181, 185, 190, 199, 245, 249, 250, 251 carbon moiety of, 129 chemical basis of protoplasm, 51 circulating, 134 cleavage products of, 70 composition of, 3, 69 consumption by fruitarians, 217 consumption by Japanese, 219, 221 decomposition by oxygen, 59 decomposition in work, 58 excessive consumption of, relation to disease, 269 effect of diet exclusively of, on rats, 239 effect on dogs of diet low in, 233, 234, 237, 245–255 fat absorption in dogs on diet low in, 261 food, real need of body for, 272 formation of carbohydrate from, 129 fuel value of, 15 fuel value of, metabolized during fasting, 86 influence of chemical character of, on nutrition, 256 diet exclusively of, upon progeny of rats, 240 diet low in, on high proteid animals, 231, 233, 243 on excretion of nitrogen, 59, 87, 90 on metabolism, 83 on metabolism of, 88 in foodstuffs, 7 katabolism, 75 luxus consumption of, 59 metabolized during fasting, 86 minimum requirement, 59 morphotic, 134 need of body for, 268 nitrogen equilibrium on diet low in, 176, 177, 181, 200, 201, 245, 249, 250, 251, 252, 255 overfeeding with, 98 reconstruction of, during absorption, 42 relation of endurance to diet low in, 210, 212 relation of fatigue to diet low in, 208 respiratory quotient of, 107 resistance of body to poisons on diet low in, 226 safety in relation to diet low in, 231 significance of complete cleavage of, 35 storing of, 92, 98, 99, 100 strength tests on diet low in, 203, 206 synthesis, 48, 49, 68 utilization of fat in dogs on diet low in, 261 utilization of nitrogen in dogs on diet low in, 262 work done at expense of, 58 Proteid diet, experiments of Neumann on low, 286 body-weight of dogs on low, 245, 249, 250, 251 body-weight of men on low, 170–175, 181, 185, 190, 199 in relation to nitrogen excretion during hard work, 123, 124 vegetable foods in relation to, 291 Proteid metabolism, influence of carbohydrate on, 92, 94, 95, 96, 97 influence of fat on, 92, 93, 96, 97 influence of proteid on, 59, 87, 90 Folin’s theory of, 144 Pflüger’s theory of, 138 significance of, 131 Voit’s theory of, 134