se of, 4;
attention to individual hygiene in, and decline in death rate, 159;
mortality statistics of, 286, 292.

Sweetbreads, excess of acids produced by, 39;
among the worst foods, 48.

Sweets, table of food values of, 182;
time for taking, 220.

Swimming, as exercise, 94;
an example of healthful activity and relaxation, 101-102;
for overweight, 217.

Syphilis, destructive effect of, 78;
resistance to, weakened by alcohol, 240.

Systemic injuries from mouth infection, 80-81.

Table, posture in sitting at a, 61.

Tea, degree of injury from, 66.

Teeth, benefits to, from hard foods, 41;
evils of insufficient mastication, 44;
infection from decayed, 78-83;
danger from over-dentistried, 83;
method of cleansing, 84-85;
periodic examinations and cleanings, 86-87;
question of saving, at expense of other parts of body, 87;
correction of irregularities, 87-88;
care of temporary, 88;
results of teeth hygiene, 88;
malformation of, a cause of nasal obstruction and colds, 272.

Temperature of living-rooms and work-rooms, 11.

Tents for outdoor sleeping, 23-24.

Thinking, exercise in, 97.

Thoughts, effect of character of, on sleep, 104-105.

Ticks, diseases spread by, 74.

Time, taking of, for hygienic living, 132-133.

Tobacco, injury from poison in, 65;
ill effects of, 68-69;
derivation of, 250-251;
composition of, 251-255;
effects on animals and on man, 255-265;
increase in use of, 267-268;
references concerning, 268-271.

Tobacco heart, risks accompanying, 263.

Tobacco smoke, air vitiation from, 13;
amount of nicotin in, 254-255, 260-261.

Toeing out and toeing in, 60, 223.

Tomatoes, cellulose in, 41;
vitamins supplied by, 42;
food value of, 176.

Tongue, cleansing, with tooth-brush, 85.

Tooth powders and pastes, use of, 85.

Toxaemia, autointoxication distinguished from, 81-82.

Traits, subdivisibility of each individual into, according to
Mendelian discovery, 295;
rules resulting from inheritability of, 296;
physical, known to act hereditarily, 297;
mental, 297-298;
moral, 298;
laws governing inheritance of, 293;
distribution of, 298-300;
socially noble and ignoble, 300-301;
mating of, in marriages, 304-305;
maturing of, at certain ages, 306;
dominant and recessive, 317-319;