Novatus the heretic, i. 284.

Number the first principle according to the Pythagorean
philosophy, i. 113.

Numenius, a Trinitarian, i. 211.

Numerals, Arabic, derived from the Hindus, ii. 40.
Introduced into different countries, ii. 49.

Oaks, objects of adoration among the German nations, i. 241.

Obelisks, Egyptian, prodigious height of, i. 76.

Observatories first introduced into Europe by the Arabs, ii. 42.

Ocean, its size, ii. 371.

Octave, the grand standard of harmonical relation among the
Pythagoreans, i. 116.

Oliva, John Peter, his comment on the Apocalypse, ii. 78.

Olympian deities, their nature, i. 50.

Omar, Khalif, takes Jerusalem, i. 335.
His behaviour contrasted with that of the Crusaders, ii. 22.

Opinion and Reason, Parmenides's work on, i. 121.

Optics, discoveries in, ii. 379.

Oratory supplanted by journalism, ii. 204.

Orchomenos, ruins of, i. 32.

Orders, monastic, rise and progress of, i. 433.

Orestes compelled to interfere to stop a riot in Alexandria, i. 322.

Organ, the, invented by Sylvester, a Benedictine monk, i. 437.

Organisms, permanence of, due to external conditions, i. 8.
Control of physical agents over, i. 9.
Dates of various, ii. 321.

Orpheus, legend of, i. 37.

Osiris, daily ceremony before tomb of, i. 89.
One of the divinities of the Egyptian theology, i. 91.
Site of temple of, given to the church, i. 319.

Osporco changes his unseemly name into Sergius, ii. 143.

Ostrogoth monarchy overthrown, i. 351.

Otho III., Emperor, contemplates a reform in the Church, and is
poisoned by Stephania, ii. 6.

Otranto taken by the Mohammedans, ii. 109.

Oxus, its drying up, i. 29.

Pacific Ocean crossed, ii. 171.

Paganism, attitude of, i. 268.
Death-blow given to, by Theodosius, i. 312.

Pagans, accusation of, against the Christians, i. 301.

Painting and sculpture, relation of the Church to, i. 360.

Palaeontology, historical sketch of early, ii. 314.

Palatine library burnt by Gregory the Great, i. 357.

Pandataria, Sylverius banished to, i. 354.

Pantheism, theology of India underlaid with, i. 59.
Adopted by Parmenides, i. 121.
Greek, i. 223.

Papacy, history of, i. 290.
Consolidation of its power in the West, i. 362.
Signal peculiarity of, i. 378.
Human origin of, i. 382.

Paper, invention of,