Dogs, effects of low proteid diet on, 232–236, 245–255 fasting experiments on, 82 fat absorption in, on low proteid diet, 233, 261 fuel value requirement of, 234, 236, 245–255 influence of low proteid diet upon body-weight in, 245–255 influence of vegetable diet on, 254, 256 nitrogen requirement of, 234, 235, 236, 245–255 photographs of, 248 proteid absorption in, on low proteid diet, 233, 262 proteid requirement, experiments by Munk, 232 proteid requirement, experiments by Rosenheim, 234 proteid requirement, experiments by Jägerroos, 236 proteid requirement, experiments by author, 243 utilization of fat in, on low proteid diet, 261 utilization of nitrogen in, on low proteid diet, 262 Disaccharides, utilization of, 40 E Edestin, cleavage products of, 70 Efficiency of body, as a machine, 111 Egg albumin, cleavage products of, 70 Endogenous metabolism, 145, 146 Endurance, relation of, to low proteid diet, 210, 212 Energy, availability of carbohydrates, as source of, 45 basal exchange, 104 carbohydrate as source of, 128 carbohydrate as source of, in fasting, 81 conservation of, in man, 103 exchange, effect of muscular work, 109, 110, 113, 115 exchange, factors modifying, 105, 106 exchange, in relation to work, 119 exchange proportional to body surface, 104, 105 fat as source of, 128 fat as source of, in fasting 81 foods as source of, 15 metabolism of, in man, 103 of muscle contraction, 121 origin of, in fasting, 81 output, in man, 103 produced by man, 106 proteid as source of, 122, 123, 124, 129 proteid as source of, in fasting, 81 source of, in body, 21, 121 source of, during fasting, in work, 125 Enterokinase, 33 Enzymes, deamidizing, 71, 72 in gastric juice, 25 in pancreatic juice, 32 in saliva, 20 intracellular, 63, 71, 72, 75 reversible action of, 21 specificity of, 21 Equilibrium, carbon, 84 nitrogenous, 78 of body, 78 Erepsin, 34 Exchange, basal energy, 104 of energy, as affected by work, 109, 110, 113, 115, 119 of energy, factors modifying, 105, 106 of energy, relation to body surface, 104, 105 Exogenous metabolism, 145, 146 F Fasting, carbohydrates as source of energy in, 81 excretion of carbon during, 84 excretion of nitrogen during, 80, 82, 84 experiments on dogs, 82 experiments on man, 80, 84 fat as source of energy in, 81 fuel value during, 86 fuel value of fat, metabolized during, 86 metabolism of fat during, 84 nitrogen excretion during, 80, 82, 84 origin of energy in, 81 proteid as source of energy in, 81 proteid metabolism during, 83 relation of nitrogen excretion to work during, 125 source of energy for work during, 125