[Immobility of society], [19], [20], [120], [144], [145]
Impulsive social action, [42], [48]
Indemnity, principle of, [95]
Indications of social change, [123], [143]
Indices of business, [125]
Individual reactions, [41], [51], [53], [55]
Industry, [31], [69], [118], [121], [144]
Industrial, accidents, [116], [135]; fatigue, [138]; hygiene, [135]
Insanity, [46]