Poison-gas, [413]

Poitiers, [432]

Poitiers, battle of, [253], [259]

Poland, [288], [327], [353], [434]

Poles, [288], [419]

Political experiment, age of, [318] et seq.

Political ideas, development of, [370] et seq.

Political science, founder of, [144]

Political worship, [412]

Polo, Marco, [299-300]