52.

Pontifical power sustained by physical force, i. 300.

Popes, biography of, from A.D. 757, i. 378.
Had no faith in the result of the Crusades, ii. 23.

Porphyry, his writings, i. 214, 404.

Porsenna takes Rome, i. 244.

Posidonius, i. 232.

Praxagoras wrote on the pulse, i. 397.

Pre-existence, Plato's notion of, i. 160.

Press, liberty of, secured, ii. 250.

"Principia," Newton's, quotation from, i. 120.
Publication of, ii. 272.
Its incomparable merit, ii. 275.

Printing, invention of, ii. 198.
Effects of, ii. 200.

Problems of Greek philosophy, i. 217.

Proclus burns Vitalian's ships, i. 215.
His theology, i. 215.

Procopius, the historian, secretary to Belisarius, ii. 58.

Profatius, a Jew, appointed regent of the faculty of
Montpellier, ii. 125.

Prosper Alpinus writes on diagnosis, ii. 285.

Protestant, origin of the name, ii. 211.

Provincial letters of Pascal, influence of, ii. 286.

Psammetichus overthrows the ancient policy of Egypt, i. 75.

"Psammites," a work of Archimedes, i. 195.

Psychology, origin of, i. 101.
Solution of questions of, ii. 344.

Ptolemies, political position of, i. 186.
Biography of, i. 200.

Ptolemy, his "Syntaxis," i. 203.

Puffendorf, author of the "Law of Nature and Nations," ii. 286.

Pulpit, influence of, affected by the press, ii. 201.
Decline of eloquence of, ii. 203.
Its relation to the drama, ii. 249.
State of, an index of the mental condition of a nation, ii. 249.

Punic wars, results of, i. 245.

Puranas, i. 65.

Pyramids of Egypt, size of, i. 75.
The Great, its antiquity and wonders, i. 81.
What they have witnessed, i. 84.
Their testimony unreliable as to the age of the world, ii. 327.

Pyrrho, the founder of the Sceptics, i. 164.

Pyrrhus, the Epirot, i. 244.

Pythagoras, biography of, i. 111.
The service he rendered us, i. 230.

Quintus Sextius, i. 258.

Quipus, a Peruvian instrument for enumeration, ii. 185.

Quito, why it was regarded as a holy place, ii. 185.

Rab, a Jewish anatomist, i. 400.

Rabanus, a Benedictine monk, sets up a school in Germany, i. 437.

Rabbis cultivate medicine, ii. 122.

Radbert, his views on transubstantiation, ii. 10.

Railways, ii. 387.

Rain, quantity of in Europe, i. 25.
Maximum points of, i. 25.

Rainless countries, agriculture in