subordination to, 609-702;
types of, 47-51;
unit of classification, 161-62;
unit of investigation, 212-13;
unity of, 198-200.
_See_ Groups, primary, Groups, secondary, Contacts, primary, Contacts,
secondary, also the names of specific groups.

GROWTH, SOCIAL, 26.

HABIT, as the individual will, 100-102.

HERD:
behavior of, 30;
contagion in, 885-86;
homogeneity of, 31;
instinct of the, 32, 724-45, 884-86;
milling in the, 788-90;
simplest type of social group, 30.

HEREDITY AND EUGENICS:
_bibliography_, 147-48.

HERITAGES, SOCIAL:
complex of stimuli, 72;
of the immigrant, 765;
investigation of, 51;
transmission of, 72.

HISTORICAL FACT, 7.

HISTORICAL PROCESS, and progress, 969-73.

HISTORICAL RACES:
as products of isolation, 257-60.

HISTORY:
a catalogue of facts, 14;
defined by Karl Pearson, 14;
and geography, 15;
as group memory, 51-52;
mother science of all the social sciences, 42, 43;
as a natural science, 23;
and the natural sciences, 6;
scientific, 4, 14;
and sociology, 5, 1-12, 16-24.

HOMOGENEITY:
and common purpose, 32;
and like-mindedness, 32.

HOUSING, and zoning studies, 328-29.

HUMAN BEINGS, as artificial products, 95.

HUMAN ECOLOGY, and competition, 558.

HUMAN NATURE:
_chap. ii_, 64-158;
_bibliography_, 147-54;
adaptability of, 95-97;
Aristotle's conception of, 140;
defined, 65-67;
described in literature, 141-43;
description and explanation of, 79;
founded on instincts, 77-78;
and the four wishes, 442-43;
Hobbes' conception, 140;
human interest in, 64-65;
investigations and problems, 139-46;
and law, 12-16;
Machiavelli's conception, 140;
and the mores, 97-100;
political conceptions, 140-41;
problems of, 47;
product of group life, 67;
product of social intercourse, 47;
product of society, 159;
and progress, 954, 957-58, 964-65, 983-1000;
religious conceptions of, 139;
and social control, 785-87; 848-49;
and social life, 69;
Spencer's conception, 141;
and war, 594-98.

HUMAN NATURE AND INDUSTRY:
_bibliography_, 149.

HUMAN SOCIETY:
contrasted with animal societies, 199-200;
and social life, 182-85.

HYPNOTISM:
a form of dissociation of memory, 472;
post-hypnotic suggestion, 477.
_See_ Suggestion.

IDEA-FORCES, 461-64.
_See_ Sentiment, Wishes.

IMITATION:
_bibliography_, 429-30;
active side of sympathy, 394-95