Note xiii.—Metallic Veins.
Specimens of native iron, § 212, 213. Margraaf's specimen, § 214. Kirwan's hypothesis, § 215. Increase of the specific gravity of native gold by fusion, no argument against its igneous origin, § 216. Specimens of gold and silver shooting through quartz, an argument in favour of the Huttonian theory, § 218, 219. Proof in favour of the same from chalcedony including calcareous spar, § 220. Matter that fills veins not from above or from either side, § 221. Opinion of the Neptunists, § 222. Supposed fact that veins are less rich as the depth increases, § 223. No marks of horizontal deposition in veins; their coating differs from stratification, § 224. Neptunists appear to be misled by the term Stratification, § 225, 226. Veins heave or shift one another, § 227. Vast force employed for that purpose, § 228. Veins of different formation, § 231. Pieces of rock insulated in veins, § 232. Supposition that veins have been filled by infiltrations, absurd, 233. Lenticular veins, and Pipe veins, § 234.
Note xiv.—On Whinstone.
Whinstone, neither of volcanic nor aqueous formation, § 235. Zeolite and carbonate of lime included in whinstone, but not in lava, ib. Not introduced by infiltration, § 236. Disposition of whinstone mountains differs from that of streams of lava, § 237. This argument first employed by Mr Strange, § 238. His general views of this subject, § 239. Explanation of the regular structure of whinstone hills, according to Dr Hutton's theory, § 240. Many hills supposed to be extinguished volcanoes, are rocks of real whinstone that has flowed deep under the surface. Vein of whinstone mistaken for a stream of lava by Faujas, § 241, 242. Submarine volcanoes of Dolomieu, § 243. Objections to this theory, § 244, 245. Dolomieu in another place contends for the aqueous formation of basaltes, § 246. His arguments answered; also those of Bergman, § 248, 249. Argument of Werner for the aqueous origin of basaltes, § 250. Remarks on the supposed gradual transition of basaltes to argillaceous schistus, § 251, 252. Of the shells said to be found in basaltes, § 253. Instances from Portrush in Ireland, and from Cerigo on the Coast of Greece, ib. and 254,—from the Veronese, § 255. Objections to the Neptunian formation of whinstone, founded on the difference between it and the contiguous stratified rocks, § 256. On the resemblance of the strata below and above certain masses of whinstone, § 257. On the irregularity of the thickness of those masses, § 258. Wedge form masses of whinstone included between strata, § 259. Consequences of this wedge form, § 260. Sandstone fragments included in whin, § 261, 262. Bending of the strata contiguous to whinstone, § 264. Induration, § 265, 266. Charring of coal by whin, § 267. Of the manner in which the bitumen may have been driven off by heat, § 268. Two kinds of fossil coke, § 269. Graduation into plumbago, ib. and 270. Only remaining objection obviated by Sir James Hall's experiments, § 271.
Note xv.—On Granite.
Granite veins of two kinds, § 274. Veins Of which the communication with large masses of the same stone is not visible: At the Isle of Coll in the Hebrides, § 275,—at Portsoy, § 276,—in Cornwall, § 277,—in Glentilt, § 278. Veins visibly connected with larger masses. Argument furnished by them in favour of this theory, § 279, 280. Impossibility of their being formed by infiltration, § 281. Veins of this kind in Arran, § 282,—Galloway, § 283,—sides of Loch Chloney, Invernessshire, §284,—St Michael's Mount, Cornwall § 285. Fragments of schistus contained in granite, § 287.
2. Granite of Portsoy.