class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">Brilliancy of the Diamond, 191. —Philosophy of Gunpowder, —New Pear-flavouring, 192. —Methylated Spirit, 193. —What is Phosphate of Lime? —What is Wood? —How long will Wood last? 194. —The Safety Match, 195. —Pottery, —Wedgwood, 196. —Imposing Mechanical Effects, 197 —Horse-power, —The First Practical Steam-boat, 198. —Effect of Heavy Seas upon Large Vessels, 199. —The Railway, —Accidents on Railways, 200. —Railways and Invasions, 202. —What the English owe to naturalized Foreigners, 203. —Geological Growth, 204. —The Earth and Man compared, —Why the Earth is presumed to be Solid, —“Implements in the Drift,” 205. —The Centre of the Earth, 206. —The Cooling of the Earth, 207. —Identity of Heat and Motion, 208 —Universal Source of Heat, 209. —Inequalities of the Earth’s Surface, 210. —Chemistry of the Sea, 212. —The Sea: its Perils, 213. —Limitations of Astronomy, 214. —Distance of the Earth from the Sun, 215. —Blue Colour of the Sky, 216. —Beauty of the Sky, 217. —High Temperatures in Balloon Ascents, —Value of Meteorological Observations, Telegraph, and Forecasts, 218. —Weather Signs, 220. —Barometer for Farmers, 222. —Icebergs and the Weather, 223. —St. Swithun: his true History, 224. —Rainfall in London, 225. —