by decomposition of, in the colon, 56;
in cheap foods, 131;
list of foods high, moderate and deficient in, 171;
experiments to determine value of, in diet, 197-199.

Prunes, food value of, 30, 179;
laxative quality of, 52.

Prussia, mortality statistics of, 286, 290-291.

Public hygiene, 157;
what is included under, 157-158;
progress made in, 158;
various important measures of, 161-163.

Puddings, table of food values of, 179.

Pumpkins, cellulose in, 41.

Purins, in flesh food, leading to production of uric acid, 39;
found in some vegetable foods, 40.

Pyorrhea, action of, 79-80;
treatment for, 85-86.

Pyridin in tobacco smoke, 260-261.

Quack remedies, to be avoided in case of colds, 280.

Quacks and quack advertising, movement against, 162-163.

Quarantine, included in public hygiene, 158.

Quensel, Ulrik, on disagreement of work and alcohol, 244.

Quick lunches, an institution of civilization, 150;
relative energy values and cost of different orders at, 184-190.

Quinine, use of, deleterious in case of colds, 280.

Race hygiene. _See_ Eugenics.

Races, effects of indoor living on different, 146-147;
varied conditions in different, with respect to resistance to
disease, 323.

Raw foods, value of, 42.

Reading, choice of, for recreation, 99.

Reading on trains, eye-strain caused by, 93.

Ready-to-serve foods, analysis and cost of, 184-190.

Recreation, outdoor, 19;
necessity for, 89, 98;
importance of enjoyment of, 98-99;
forms of, 99;
advantages possessed by games, 99;
reading, dancing and card-playing, 99-100;
suicidal amusements, 100.

Regime, demand for a well-balanced, 125-126.

Relatives, marriage of, 305-306.

Relaxation, cultivation of power of, 101;
bathing a help to, 102.

Religion, as a help in field of mental hygiene, 114;
of healthy-mindedness, 114-115.

Reproduction, rules of, under a eugenic program, 167.

Rest and sleep, the two great forms of inactivity, 89.

Rheumatism, traceable to focal infection, 82.

Rice, not a laxative food, 52;
food value of, 180.

Richards, Mrs., on cost of food, 130.

Roosevelt Conservation Commission on National Vitality, report of, 136.

Rosenau, Dr., on sex instruction, 77.

Rowing-machine, home exercise on, 94.

Rubner, Prof., on injuries from overabundance of