us flesh abstainers, tests of, 197-199.

Fletcher, Horace, interest in mastication revived by, 46;
experiment with method of, of thorough mastication, 200-209.

Flies, diseases carried by, 71;
guarding against typhoid germs carried by, 73;
methods of destroying, 73-74.

Focal infection, as a cause of disease, 81;
diseases traceable to, 82;
caution necessary in accepting principle too literally, 83;
physical examinations to detect, 292.

Food, quantity of, 28;
measurement of, by calories, 28;
values of common foods, 29-30;
the daily amount needed per person, 30;
precautions regarding, in case of overweight, 32-33, 215-216;
rules regarding, in case of underweight, 33, 219-220;
diet in middle life, 33-34;
diet in hot weather, 34;
comparative amount needed by brain-workers, 34-35;
eating when fatigued, 35;
protein foods, 35-40;
advantages of hard foods, 40-41;
bulk a necessity in, 41-42, 148-150;
objection to concentrated, 41;
value of raw foods, 42;
cooking necessary for some, 43;
thorough mastication of, important, 44-47;
enjoyment of, desirable, 46-47;
choice of foods influenced by slow eating, 47;
"good" and "bad" foods, 47-48;
digestibility of so-called indigestible, 49;
avoidance of fads as to, 50;
consultation of physician regarding, 50;
regulation of bowels by, 52;
harmful preservatives and adulterants in, 65;
comparative cost of, 129-131;
drawbacks of civilization illustrated by, 148;
soft and concentrated foods artificial, 148-150;
the hurry habit and eating of, 150-151;
misleading of appetites for, 151-152;
tabular classification of common foods, 171;
ideal proportion of the three elements in, 173;
tabular list of values of, in daily diet, 175-183;
relative energy value and cost of ready-to-serve foods, 184-190;
minimal cost of, 190-194;
calories consumed daily by different classes of workers, 195;
experiments with mastication and instinctive eating, 200-209;
references on, 209-211;
negative value of alcohol as, 241-242.

Fowl, a high-protein food, 38;
special objections to too great an amount of, 39.

France, consumption of alcohol in, 236;
mortality statistics of, 286.

Franklin, Benjamin, views of, concerning colds, 124.

Fruit, to be eaten in middle life, 33;
suitable for eating when