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INDEX.
345
Diluvial period, theories accounting for the phenomena of the, i. 281, et seq. General considerations of the phenomena of, 316, et seq. Zoological and botanical characters of the period, 319. See Post-tertiary Strata. Lakes of the, ii. 48.
Diluvium, i. 278. 281. See Post-tertiary Strata.
Dislocations of strata, their direction considered, ii. 292, et seq. See under heads of the various Strata.
Disturbances of stratification in British Islands, tables of, ii. 152.
Dolcoath Mine, depth of, ii. 170. Its temperature, 271.
Dolgelly, valley of, i. 134.
Dolomitic limestone, description and origin of, ii. 133.
Donati, M., his researches in the Adriatic, i. 46. On deposits of the Rhone, ii. 29.
Drainage, effects of, ii. 21.
Dream Cavern, skeleton of a rhinoceros found in, i. 311.
Drift in post-tertiary strata, i. 281.
Dudley, corals found in rocks of, i. 138.
Dufrenoy, M., his remarks on the strata of the Pyrenees, i. 244. His memoir on the tertiaries of France, 257. 259. On the metalliferous veins of the Pyrenees, 162. On volcanos, 205.
Dünolly, cubic pyrites found at, i. 126.
Durham, dislocation of coal and limestone strata in, i. 50.
Dykes, another name for faults, i. 40. Their extent and frequency, 42. Their relation to disturbed rocks, 44. See Strata.
Dykes in igneous rocks, ii. 98. Singular combination of, at Kaghlin, 128. Remarkable one at Cockfield, 132.
E.
Earn, Loch, stratification in the quartz rock of, i. 115, 116.
Earth, strata of the, its age, how ascertained, i. 8. Physical changes of the, how determined, 18. 20. Chemical data for the exterior parts of the, 23. Composition of its mass, 23. Physical data of its interior constitution, 26. Its mass, whence derived, 28. Structure of its external parts, 33.
Historical view of stratified rocks in the crust of, 107. Granitic base of the crust of, 108. Disturbances in the crust at the close of the Silurian period, 149. Disturbances at the close of the Secondary period, 244. Disturbances during and after the Tertiary period, 276. Waste of the, ii. 9. Effects of rain, &c., as agents of disintegration of, 10, et seq. Unstratified rocks in crust of, 71. Huttonian hypothesis of its construction, 194. Modern effects of heat in, 200. See Heat, Volcanos. Experimental inquiries into heat of, 262. Its physical geography, 286. Its distribution into land and sea, 286. Heights and depths of, 288. Displacements of stratified rocks of, 289. Direction of anticlinal lines of, 292. Periods of ordinary and critical action of, 301. Modern period of ordinary action of, 304. Climate of, 305. Hypotheses advanced accounting for climates of, 305, et seq. See Heat. Aspect of the surface of, 319. Outline of the land and sea portions of, 320. Undulations of the interior of, 322. Scenery of, 324. Agriculture of, dependent on a proper knowledge of its geology, 326. Proper construction of roads, &c., dependent on a knowledge of its strata, 329. Knowledge of the various strata of, and their qualities, necessary for architectural and building purposes, 330. This knowledge requisite also for successful acquisition of its mineral and other products. 331.
Earths, proportions of oxygen contained in various, i. 24.
Earthquakes premonitory of volcanic eruptions, ii. 208. 221. Towns destroyed by, 221. Phenomena attending, 234, et seq. Account of various, 241. Movements of, described, 243. Theories accounting for, 243, et seq. Wave movements of, 243, 244.
Egypt, Lower, the gift of the Nile, ii.28.
Eifel, extinct volcanos of the, ii. 135. 202. 216. 220.
Electricity, currents of, their effects on metallic bodies, ii. 114. 195. Mr. Fox's theory accounting for, 114. 195, et seq.
Elevation of mountains, ii. 289. 290.
Elgin, fossil remains at, i. 92.
