* X CONTENTS. 



171. Indices of refraction for fluorite 184 



, 172. " " " " " temperature coefficients . . . 184 



v 173. " " " " Iceland spar 'V . 184 



: 174. " " " " nitroso-dimethyl-aniline . . . . 184 



175. " " " quartz 185 



176. " " " " various monorefringents 186 



177. " " " " " uniaxial crystals 187 



178. " " " " " biaxial crystals 187 



179. " " " " solutions of salts and acids : 



(a) solutions in water . . . .188 



(b) " alcohol . . . .188 



(c) " " potassium permanganate . 188 



180. " " " " various liquids 189 



181. " " " " gases and vapors 190 



182. Reflection of light, perpendicular incidence : various values of n . . 191 



183. " " " incidence varying : n near unity .... 191 



184. " " " " " =i.55 .191 



185. Reflection from metals 192 



1 86. Transmission of Jena glasses . . . . . . . 193 



187. " " " 193 



188. " " " ultra-violet glasses 193 



189. " " alum, rock salt, sylvine, fluorite, Iceland spar, quartz 194 



190. Color screens (Landolt) 195 



191. " " (Wood) 195 



192. " " (Jena glasses) ........ 196 



193. Rotation of the plane of polarized light by solutions .... 197 



194. " " " " " " " " sodium chlorate and quartz 197 



195. Colors of thin films, Newton's rings 198 



196. Thermal conductivity of metals and alloys 199 



197. " " " various substances ...... 200 



198. " " " water and salt solutions . . . .200 



199. " " " organic liquids 200 



200. " " " gases 200 



201. Heat of combustion . . . . . . . . . . 201 



202. Heat values and analyses of various fuels : (a) coals .... 202 



(fr) peats . . . .202 

 (c) liquid fuels . . .202 



203. Chemical and physical properties of explosives . . . . . 203 



204. Heat of combination .......... 204 



205. Latent heat of vaporization 206 



206. " " " fusion 208 



207. Melting-points of the chemical elements 209 



208. Boiling-points " " " " 210 



209. Melting-points of various inorganic compounds . . .211 



210. Boiling-points " " " " 213 



211. Melting points of various mixtures of metals . . .-214 



212. " " " " " " " 214 



213. Low-melting-point alloys .. .214 



