Part 33

Pacific Ocean, 180.

Palinurus, 243.

Parable, 224.

Paris: Observatory, 42, 233, 247; Exposition, 112.

Parker’s Lens, 103.

Peirce, Professor, 44.

Pennsylvania Coal, 97.

Penumbra, 11, 19, 20.

Perpignan, France, 42.

Perseus, 196.

Persian Rugs, 70.

Philadelphia, 88.

Philosopher’s Stone, 92.

Phœbus, 34.

Phosphorus, 221.

Photographic Plate, 71.

Photography, 9, 19, 128, 236, 237, 241, 244, 247, 248; rapid, 242.

Photometer, 56, 108.

Photometry, 230.

Photosphere, 7, 17, 64.

Pickering, Professor, 132, 227, 228, 246.

Pico Summit, 148.

Piffard, Dr. H. G., 245.

Pike’s Peak, 50, 53–57, 60.

Pilgrim Fathers, 5.

Pine-boughs, 25.

Pine-trees, 60, 72.

Pittsburg Observations, 18, 19. (See Allegheny, Langley.)