248 



INDEX. 



Stars seen by Daylight, 102. 



Stars that have disappeared, 76. 



Stars, Why created, 75. 



Stereoscope and Photograph, 47. 



Stereoscope simplified, 47. 



Storm, Impetus of, 164. 



Storms, Kevolving, 164. 



Storms, to tell the Approach of, 

 163. 



Storm-glass, How to make, 164. 



Succession of Life in Time, 128. 



Sun, Actinic Power of, 62. 



Sun and Fixed Stars' Light com- 

 pared, 64. 



Sun and Terrestrial Magnetism. 64. 



" Sun Darkened," 64. 



Sun, Great Size of, on Horizon, 61. 



Sun, Heating Power of, 62. 



Sun, Lost Heat of, 103. 



Sun, Luminous Disc of, 60. 



Sun, Nature of the, 59, 238. 



Sun, Spots on, 67. 



Sun, Translatory Motion of, 61. 



Sun's Distance by the Yard Mea- 

 sure, 66. 



Sun's Heat, Is it decreasing ? 65. 



Sun's Kays increasing the Strength 

 of Magnets, 196. 



Sun's Light and Terrestrial Lights, 

 61. 



Sun-dial, Universal, 65. 



TELEGRAPH, the Atlantic, 226. 



Telegraph, the Electric, 220. 



Telescope and Microscope, the, 38. 



Telescope, Galileo's, 93. 



Telescope, Herschel's, 95. 



Telescope, Newton's first Reflect- 



Telescopes, Antiquity of, 94. 



Telescopes, Gigantic, proposed, 99. 

 ing, 94. 



Telescopes, the Earl of Rosse's, 96. 



Temperature and Electricity, 208. 



Terrestrial Magnetism, Origin of, 

 200. 



Thames, the, and its Salt-water 

 Bed, 182. 



Threads, the two Electric, 215. 



Thunderstorm seen from a Bal- 

 loon, 169. 



Tides, How produced by Sun and 

 Moon, 66. 



Time an Element of Force, 19. 

 Time, Minute Measurement of. 



194. 



Topaz, Transmutation of, 37. 

 Trilobite, the, 138. 

 Tuning-fork a Flute-player, 28. 

 Twilight, Beauty of. 148. 



UNIVERSE, Vast Numbers in, 75. 

 Utah, Salt Lake of, 113. 



VELOCITY of the Solar System, 59. 

 Vesta and Pallas, Speculations on, 



82. 



Vesuvius, Great Eruptions of, 119. 

 Vibration of Heated Metals, 188. 

 Visibility of Objects, 30. 

 Voice, Human, Audibility of, 27. 

 Volcanic Action and Geological 



Change, 118. 



Volcanic Dust, Travels of, 119. 

 Volcanic Islands, Disappearance 



of, 117. 

 Voltaic Battery and the Gymno- 



tus, 206. 



Voltaic Currents in Mines, 206. 

 Voltaic Electricity discovered, 205. 



WATCHES, Harrison's Prize, 229. 



Water decomposed by Electricity, 

 208. 



Water, Running, Force of, 114. 



Waters of the Globe gradually de- 

 creasing, 113. 



Water-Purifiers, Natural, 234. 



Waterspouts, How formed in the 

 Java Sea, 160. 



Waves, Cause of, 1 83. 



Waves, Force of, 184. 



Waves, Rate of Travelling, 183. 



Wenham-Lake Ice, Purity of, 

 161. 



West, Superior Salubrity of, 150. 



" White Water," and "Luminous 

 Animals at Sea, 173. 



Winds, Transporting Power of, 

 163. 



Wollaston's Minute Battery, 204. 



World, All the, in Motion, 11. 



World, the, in a Nutshell, 13. 



Worlds, More than One, 56. 



Worlds to come, 58. 



