Moon: practical observations, 2; newly studied, 3; distance, 4–6; size, 5, 6, 140, 156; shadows (_q. v._), 36, 125; in sun-eclipse, 41; planetary relations, 117–174; and Jupiter, 127; photograph, 137; full, 141, 144, 147; Man in the, 143; mountains, 144; craters, 147, 148; temperature, 159; airless, 160; landscape (_q. v._), 169; age, 171; broken up, 192; like comet, 215. (See _Lunar_.) Moslem Traditions, 175, 194. (See _Arab_.) Moss, 160. Mouchot’s Engravings, 109, 112. Mountain Sickness, 50, 53. Naples, 155, 157. (See _Vesuvius_.) Napoleon, 80, 134. Nasmyth’s Researches, 11, 12, 14, 24, 25, 140. Nativity of Jesus, 229. Nature’s Laws (_q. v._), 176. Nebulæ, 247. Needle, 228. (See _Cambric_.) Neptune, 121. Nerves, none in camera, 47. Nerve Transmission, 5, 6. New Astronomy, 4, 75, 76, 117, 121, 171, 193, 222, 224, 227, 235, 246, 248. (See _Old_.) Newcomb, Professor, 55. Newspapers, printed by the sun, 74. Newton, Professor, 191, 195–197. Newton, Sir Isaac, 136, 203, 211; on Comets, 215, 219. Nightmare, 67. Northern Crown, 208, 211, 230. Novelists, theme for, 193, 228. Nucleus, 11, 19, 216. (See _Comets_, _Corona_.) Oceans, 179. Old Astronomy, 199, 203, 233. (See _New_.) Organisms in sun (_q. v._), 13. Orion, 238, 239, 247. Oxygen, 73. 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_.) Planetoids, 196, 197, 229. Planets: condition, 97; pulverized, 100; and moon, 117–174; isolated, 176. (See _Jupiter_, _Mars_, _Mercury_, _Saturn_, _Sirius_, _Stars_.) Plants, 72, 73. (See _Flowers_.) Plato Crater, 147, 148, 151, 152. Pleiades, 17, 231, 245. (See _Lost_.) Plume, The, 19, 23, 24, 55. Pointers, 208. (See _Dipper_.) Poison, 222. Polariscope, 49. Polarization, 18. Polarizing Eye-piece, 14, 18. Polar Star, 230. (See _Great Bear_.) Polyp, 152. Pores, 24. Pouillet’s Invention, 93. Printing, indebtedness to the sun, 74. Prism, 63, 64. (See _Colors_, _Scarlet_.) Proctor’s Observations, 14, 59, 69, 87.