Icons, [163], [186], [236], [308]
Idolatry, early Christian aversion to, [75], [84], [107], [125], [185]; later Christian practice of, [75], [101], [125], [163], [177], [184] sq., [241]
Ignatius, Epistles of, [3], [4], [5]; character of, [83] Imitatio Christi, the, [86], [211], [212]
Immaculate Conception, [188]
Immortality, doctrine of, [27], [35], [49], [57], [58], [59], [62], [196]
Imperialism, Roman, [41], [86], [110], [119], [127], [139], [140], [160], [183]; modern, [204], [242] Impostors, The Three, [234]
Incarnation, [38]
"Incorruptibilist" controversy, [153] Index Expurgatorius, [275]
India, religions of, [42], [56], [61]; Christianity in, [292] sq.
Indulgences, doctrine of, [182], [192]; traffic in, [193], [249] sq.