Pisces, map of, 71. mythology of, 74. Piscis Australis, 67. Plato, 135. Pleiades, 10, 22, 89, 95. names of the, 100. mythology of, 100. and the Flood, 101, 102. and the Great Pyramid, 101. picture of the, 103. common motion of the, 104. Pleione, 102, 103. Pole-star, 10, 26. Pollux, 17. Praesepe (the Manger), 15. Prime Meridian, 74. Proclus, 127. Procyon, 9, 20. Pyramid of Cheops and the Pleiades, 101. Pyrenees Mountains, 128. Ras Alhague ([alpha] Ophiuchi), 42. Rays of the Moon, 131. Regulus, 9, 11. Revolution of the heavens, 7, 30. Rho Ophiuchi, 33. Rigel, 91, 94, 98, 108. Ring Nebula, 50. "Royal Family," 63, 75. Rutherford, photograph of the moon, 122. Sadalmelik ([alpha] Aquarii), 67. Sagitta, map of, 56. Sagittarius, map of, 34. mythology of, 34. Saiph, 90. Saturn, 142. Scorpio, map of, 34. mythology of, 32. pair of stars in sting of, 37. Schickhard, 130. Sea of Clouds, 130. Sea of Cold, 129. Sea of Fertility, 127. Sea of Humors, 130. Sea of Nectar, 128. Sea of Serenity, 128. Sea of Showers, 129. Sea of Tranquillity, 127. Sea of Vapors, 129. Secchi, Father, types of the stars, 106. description of a star-swarm, 39. Seiss, Rev. Dr., on Canis Minor, 21. description of Auriga, 23. Sheratan ([beta] Arietis), 75. Sidus Ludovicianum, 27. Sirius, 9, 22, 91. color of, 111. size and distance of, 112. the companion of, 21, 114. its light compared with the sun's, 46. Sigma Tauri, 99. Sixty-one Cygni, 56. Smyth, Admiral, on Capricorn, 67. description of Aldebaran, 98. description of 35 M, 18. Solstice, summer, 16, 19. winter, 38. Sobieski's Shield, 39. Solar system, voyaging of, in space, 43. Southern Cross, 91, 116. South Sea, 130. Spectroscopic analysis, 3, 98. Spica, 10, 24, 26, 51. Spring, map of the stars of, 8. Square of Pegasus, 69. St. Paul, acquainted with the constellations, 19. Star-Clusters (see Nebulae, etc.). Star-Cluster, light in a, 45. Summer, map of the stars of, 31. Sun, opera-glass observations of the, 145. the, a variable star, 72. Sword of Orion, 107. Taurus, map of, 93. mythology of, 102. the "Golden Horns" of, 96. Poniatowskii, 42. Tau Aquarii, 68. Taygeta, 103. Temporary stars: 134 B. C. the first on record, 35. 393 A. D., 35. 827, 35. 1203, 35. 1572, Tycho's star, 87. 1578, 36. 1604, 36, 42. 1860, 35, 81. 1885, 80. Temple, discovers a nebula in the Pleiades, 104. Tennyson, describes the Pleiades, 105. Theophilus, 135. Theta Orionis, 107. Serpentis, 43. Tauri, 99. Tobias Mayer, sees the planet Neptune, 69. Triangles, map of the, 71. mythology of, 75. Twenty-two Canis Majoris, 112. Scorpii, 33.