INDEX. 



ABERTSTWITH, grey grit of, 95. 



Abich, 3, 193. 



Acanthopterygii, 504. 



Accessory minerals in mica schist, 376. 



in trachyte, 266. 



Acid granite of Croghan Kinshela, 246. 



Acidic rocks of North of Ireland, 314. 



Acidic volcanic rocks, 35. 



Acklington dyke, 339. 



Actinolite, 25. 



Actinozoa, orders of, 481. 



Adams, Professor J. C., 11. 



^Eolian rocks, 107. 



Agassiz, Alex., on young osseous fishes, 



501. 

 Louis, on antiquity of coral reefs, 



115. 

 Age of an upheaval, 332. 



of igneous rocks, 228. 



Agnostus, figure of, 493. 

 Agricola, 3. 

 Ailsa Craig, 251. 

 Aim of this work, 8. 

 Airey, Sir G. B., 9. 

 Aix, flora of, 474. 

 A line, 16. 

 Albite, 23. 



in Leinster granite. 245. 



in Scotch rocks, 362. 



Alcyonaria, 481. 



Aldabaran, 17. 



Alderley edge, copper of, 418. 



Aleutian province, 458. 



Allen, Joel Asaph, on Arctic region, 461. 



Alloys, 400. 



Allport on basalts, 278. 



on Brent Tor, 302. 



on carboniferous dolerites, 304. 



on diorites, 304. 



on greenstones, 280. 



on the Wolf Kock, 251. 



on the Wrekin, 291. 

 Alps, gneiss of, 394. 

 valleys in, 149. 



Alston Moor, dislocations of, 328. 



lead of, 411, 424. 



rivers of, 153. 



Alternation of beds, 89. 

 Alum, 46. 



Alum Bay, 46. 



sands of, 97. 



flora, 475. 



America, metamorphic rocks of, 395. 

 American andesites, 261. 



augite andesites, 275. 



birds, 519. 



dacites, 263. 



dinosaurs, 516. 



diorites, 226. 



forest region, 470. 



gneiss, 395. 



granite, 220. 



Jurassic bird, 519. 



marsupials, 520. 



propylite, 256. 



rhyolites, 272. 



trachytes, 265. 



Ammonites, divisions of, 500. 



figure of, 500. 



Amphibole in polarised light, 253. 



Anacanthini, 505. 



Analogy of distant deposits, 68. 



of mineral veins and trap dykes, 80. 



Analyses of albite, 362. 



of American andesites, 261. 



basalts, 282. 



dacites, 261. 



diorite, 256. 



propylite, 256. 



rhyolite, 272. 



trachyte, 265. 



of amphibole, 369. 



of andesine, 363. 



of andesite, 299. 



of anorthite, 364. 



of augite andesite, 259. 



of basalt, 277. 



of biotite, 365. 



of chlorite, 367. 



of clays, 206. 



of felsite porphyry, 270. 



of f oyaite, 224. 



of garnets, 369. 



of granite, 231, 238, 243, 244, 246. 



of haughtonite, 366. 



of labradorite, 363. 



of latrobite, 364. 



of lepidomelane, 365. 



of leucite basalt, 284. 



of magarodite, 365. 



of muscovite, 365. 



of oligoclase, 363. 



of orthoclase, 262. 



of phonolite, 251. 



