2
Planets, 2
Plant lice, 13
Plants, 22, 23, 36
Platea, battle of, 136, 430
Plato, 140, 142, 144, 170, 370- 71
Platypus, duck-billed, 34
Plebeians, Roman, 176, 177, 187-88
Plesiosaurs, 29, 30, 36
Poison-gas, 413
Poitiers, 432
Poitiers, battle of, 253, 259
Poland,