279, 280, 432
Innocent IV, Pope, 281
Innsbruck, 313
Inquisition, the, 276, 349
Insects, 26, 31
Interdicts, papal, 275
Interglacial period, 44
Internationalism, 380
Invertebrata, 13
Investitures, 275
Ionic Greeks, 108, 130
Iowa, 385
Ireland, 106, 405
Iron, 80, 87, 94, 97, 102, 104,