Soma, 33.

Soul, origin of idea of, 265-267.
Species, 29-30, 40, 46-49; human
and other, 40; origin of, 29-30.
Speech, origin of articulate, 111-

114.

Spencer, B., & Gillen, F. J., cited,

255, 256, 258; quoted, 255.
Spirits, ancestor-worship, 195, 269,
284-285; belief in, 251, 264; con-
tinuous theory of spiritual exist-
ence, 269; retributive theory of
spiritual existence, 269.
Sports, biological, 9-10.
Spy cranium, 58.

Stable variation, 6, 9-10.
Statistics, and study of biological
phenomena, 4, 8–9.

Stimuli, 108-109; primary, 108;
secondary, 109.

Stimulation and response, 108-109.
Stone implements, 76-101, 241.
Stone ages, 76-101, 227.
Strehlow, C., cited, 256.

Strépyan epoch, 76.

Struggle for existence, 20-38; among
plants and animals, 20; among
men, 22-24, 46-49, 87-91; and
natural selection, 20-38; and
survival of the fit, 21, 24, 87-91,
114-116.

Suetonius, cited, 185.
Suggestion, 185-186, 187, 188-190;
conditions of suggestibility, 187-
190; defined, 187-188.

Summary of theory of natural se-

lection, 30-31.

Sumner, W. G., cited, 181, 182;

quoted, 177, 183.

Sun's rays and skin color, 221-222.
Superstition, 116, 117, 118, 165,
166-169.

Surplus, economic, 150, 276, 293-
294.

Survival of the fit, 21, 24, 87-91,
114-116.

Swanton, J. R., cited, 246.

Taboo, 245, 250, 255, 275.
Tacitus, cited, 289.

Tarde, G., cited, 190, 191, 192, 193,
194, 195, 292; quoted, 192–193,
194, 195.

Tertiary period, 52, 57.
Teutonic race, 217-218, 223.
Thomson, J. A., & Geddes, P., cited,
5, 6, 9, 13, 15, 17, 25, 32.
Thorndike, E. L., cited, 7.
Topography, 146-149, 152, 165, 166;
and isolation, 152; and migration,
146-149.

Torrid region, 133.

Totem, 245-258; in Australia, 254-
257; in British Columbia, 246-
254; defined, 245.
Transylvania, 154.

Tradition, 57, 83-86, 117, 137, 154,
171-202, 247-248, 254, 255, 279.
Transmigration of souls, theory of,
269.

Tribal society, 233-277.
Tribe, 241.

Tylor, E. B., cited, 264, 267, 268,
280.

Type, 6, 7, 8, 27, 28, 117, 203-204,
213, 221.

Unlike response, 110.

Usages, 116, 117, 145, 165–169, 171-
202, 291, 292.

Variation, 1-19, 36-37, 106-107,
117, 118, 182; congenital, 36–37;
continuous, 4-7; discontinuous, 6,
10; fluctuating, 3-8; germinal, 6,
36-37; and selection, 23, 31, 106-

107, 117, 118; stable, 6, 9-10.
Von Treitschke, H., cited, 160.
Vestigial structures, 40-43.

Waitz, T., cited, 229.
Wallace, cited, 103.