INDEX. 



247 



Pleiades, the, 77. 

 Plurality of Worlds, 57. 

 Polar Ice, Immensity of, 181. 

 Polar Iceberg, 180. 

 Polarisation of Light, 33. 

 Pole, Open Sea at the, 181. 

 Pole-Star of 4000 years ago, 76. 

 Profitable Science, 139. 

 Pterodactyl, the, 130. 

 Pyramid, Duration of the, 14. 



QUARTZ, Down of, 42. 



EAIN, All in the World, 155. 

 Eain, an Inch on the Atlantic, 156. 

 Bain-Drops, Size of, 154. 

 Rain, How the North Wind drives 



it away, 154. 

 Rain, Philosophy of, 153. 

 Rainless Districts, 155. 

 Rain-making Vapour, from South 



to North, 152. 



Rainy Climate, Inordinate, 154. 

 Red Sea and Mediterranean Levels, 



175. 



Red Sea, Colour of, 176. 

 Repulsion of Bodies, 216. 

 Rhinoceros of Britain, 135. 

 River- water on the Ocean, 181. 

 Rose, no Fossil, 142. 

 Rosse, the Earl of, his "Telescope," 



96-99. 

 Rotation - Magnetism discovered, 



199. 

 Rotation, the Axis of, 11. 



ST. PAUL'S CATHEDRAL, how pro- 

 tected from Lightning, 167. 



Salt, All in the Sea, 179. 



Salt Lake of Utah, 113. 



Salt, Solvent Action of, 115. 



Sal tn ess of the Sea', How to tell, 

 179. 



Sand in the Hour-glass, 20. 



Sand of the Sea and Desert, 106. 



Saturn's Ring, Was it known to 

 the Ancients? 81. 



Schwabe, on Sun-Spots, 68. 



Science at Oxford and Cambridge, 



Science of the Ancient World, 1. 



Science, Theoretical, Practical Re- 

 sults of, 4. 



Sciences, Plato's Survey of, 2. 



Scientific Treatise, the Earliest En- 

 glish, 5. 



Scoresby, Dr., on the Rosse Tele- 

 scope, 99. 



Scratches, Colours of, 36. 



Sea, Bottles and Currents at, 172. 



Sea, Bottom of, a burial-place, 177. 



Sea, Circulation of the, 170. 



Sea, Climates of the, 170. 



Sea, Deep, Life of the, 174. 



Sea, Greatest ascertained Depth 

 of, 175. 



Sea, Solitude at, 172. 



Sea, Temperature of the, 170. 



Sea, Why is it Salt? 177. 



Seas, Primeval, Depth of, 234. 



Sea-breezes and Land-breezes il- 

 lustrated, 150. 



Sea-milk, What is it? 176. 



Sea-routes, How shortened, 184. 



Sea-shells and Animalcules, Ser- 

 vices of, 234. 



Sea-shells, Why found at Great 

 Heights, 106. 



Sea-water, to imitate, 235. 



Sea-water, Properties of, 179. 



Serapis, Temple of, Successive 

 Changes in, 111. 



Sheep, Geology of the, 138. 



Shells, Geometry of, 232. 



Shells, Hydraulic Theory of, 233. 



Siamese Twins, the, galvanised, 

 203. 



Skin, Dark Colour of the, 63. 



Smith, William, the Geologist, 126. 



Snow, Absence of in Siberia, 159. 



Snow, Impurity of, 158. 



Snow Phenomenon, 158. 



Snow, Warmth of, in Arctic La- 

 titudes, 158. 



Snow-capped Volcano, the, 119. 



Snow - crystals observed by the 

 Chinese, 159. 



Soap-bubble, Science of the, 48. 



Solar Heat, Extreme, 63. 



Solar System, Velocity of, 59. 



Sound, Figures produced by, 28. 



Sound in rarefied Air, 27. 



Sounding Sand, 27. 



Space, Infinite, 86. 



Speed, Varieties of, 17. 



Spheres, Music of the, 55. 



Spots on the Sun, 67. 



Star, Fixed, the nearest, 78. 



Stars' Colour, Change in, 77. 



Star's Light sixteen times that of 

 the Sun, 79. 



Stars, Number of, 75. 



