CONTENTS. XI 



216. Transmissibility of radiation by alum, rock salt, sylvine, fluorite, Ice- 



land spar, quartz . 200 



217. Color screens (Landolt) 201 



218. " " (Wood) 201 



219. " " (Jena glasses) ........ 202 



2i9a. Transmissibility of radiation by water 202 



220. Rotation of the plane of polarized light by solutions .... 203 



221. " " " " ** " " sodium chlorate and quartz 203 



222. Colors of thin films, Newton's rings 204 



223. Thermal conductivity of metals and alloys 205 



224. Thermal conductivity at high temperature 206 



225. " " of various substances 207 



226. " " " water and salt solutions .... 207 



227. " " " organic liquids 207 



228. " " " gases 207 



229. Diffusivities ........... 208 



230. Heat of combustion .......... 209 



231. Heat values and analyses of various fuels : (a) coals .... 210 



(b) peats . . . .210 



(c) liquid fuels . .210 



232. Chemical and physical properties of explosives 211 



233. Heat of combination . . . . . . . . . .212 



234. Latent heat of vaporization .214 



235. " " " fusion 216 



236. Melting-points of the chemical elements . . . . . .217 



237. Boiling-points " " " " .... 218 



238. Densities, melting and boiling points, inorganic compounds . .219 



239. Effect of pressure on melting points . 220 



240. " " " " freezing point of water 221 



241. Melting points of various mixtures of metals 222 



2 4 2. " .<'" " " 222 



243. Low-melting-point alloys . . . . . . . . .222 



244. Densities, melting-points, boiling-points of organic compounds : 



(a) Paraffin series 223 



(b) Olefine series 223 



(c) Acetylene series 224 



(if) Monatomic alcohols 224 



(e) Alcoholic ethers 224 



(/) Ethyl ethers 224 



(g) Miscellaneous ......... 225 



245. Transformation and melting-points, minerals and eutectics . . . 226 



246. Lowering of freezing-points by salts in solution ..... 227 



247. Raising of boiling-points by salts in solution ..... 229 



248. Freezing mixtures ... 230 



249. Critical temperatures, pressure, volumes and densities of gases . .231 



250. Coefficients of linear expansion of the chemical elements . . . 232 



