COXTKNTi. TXIII 



. 200. Metallic Colours . . 283 



.201. Non-metallic colqurs . . 284 



. 202. Series of Colours . . 292 

 . 203. Several other peculiarities in the occurrence of 



Colours . . . 293 



. 204. The Streak . ... 296 



. 205. Degrees of Transparency . . 297 



CHAPTER II. 



Oftlie Physical Properties of Miner ah. 



. 206. Explanation . . .298 



. 207. State of Aggregation . . 299 



. 208. Hardness . . .300 



. 209. Specific Gravity . . 307 



. 210. Magnetism . . .310 



. 211. Electricity ... 310 



. 212. Taste . . . .311 



. 213. Odour . . 312 



PART II. 

 THEORY OF THE SYSTEM. 



. 214. Identity , . . .314 



.215. Difference . . . 314 



. 216. Degrees of Difference . . 315 

 . 217. Mutual relations of the Natural-Historical Pro- 



perties in certain Individuals . 317 

 . 218. Individuals brought under the idea of Identity 318 



. 219. Connexion of several Series of Individuals . 320 



. 220. Species ... 324 



.221. Transitions . . .325 



. 222. Homogeneity from the Transitions . 326 



. 223. Principle of Classification . . 329 



. 224. Degrees of Natural-Historical Resemblance 330 



. 225. Genus . . .331 



. 226. Mineral Kingdom . . 334 



.227. Order . . * . . 337 



