6 3 8 



Index. 



GUASCO 



Guasco, elevation of, 261 



— secondary formation of, 550 

 Guiti u-gueyu, Sierra, 434 

 Guyana, gneissic rocks of, 424 

 Gypsum at Ascension, 61 



- — in volcanic strata, at St. Helena, 

 86 



— on surface of the ground at St. 

 Helena, 98 



• — nodules of, in gravel at Rio 

 Negro, 219 



— deposited from sea-water, 273 

 ■ — deposits of, at Iquique, 303 



— crystals of, in salt lakes, 304 



— in Pampean formation, 317 



— in tertiary formation of Pata- 

 gonia, 371, 373, 377, 378 



— great formation of, in the Por- 

 tillo Pass, 487, 489 



in the Cunibre Pass, 504, 



509 



near Los Hornos. 536 



at Coquimbo. 542 



at Copiapo, 553, 557 



near Iquique, 578 



— of San Lorenzo, .">7D 



HALL, Capt., on terraces at 

 Coquimbo, 255 

 Hall, Sir J., on the expulsion of 



carbonic acid gas, 9 

 Hamilton, Mr., on elevation near 



Tacna, 266 

 Harlan, Dr., on human remains, 



1 93 

 Haves, Mr. A., on nitrate of soda, 



305 

 Heat, action of, on calcareous 



matter. 8 

 Helix (f ossil), 174 

 Helix melo, 163 

 Hemitrypa (fossil), 183 

 Hennah, Mr., on ashes at Ascen- 

 sion, 12 

 Henslow, Prof., on chalcedony, 54 

 — on concretions, 164 

 Herbert, Capt., on valleys in the 



Himalaya, 286 

 Herradura Bav, elevated shells of, 



2c 



INCRUSTATIONS 



Herradura Bay, tertiary forma- 

 tions of, 403 

 Himalaya, valleys in, 286 

 Hippurites CMlensis, 542, 518 

 Hitchcock, Prof., on dikes, 424 

 Hoffman, on decomposed trachvte, 



29 

 Holland, Dr., on Iceland, 108 

 Honestones, pseudo, of Coquimbo, 

 543 



of Copiapo, 552 



Hooker, Dr. J. D., on fossil beech 



leaves, 386 

 Hopkins, Mr., on axes of elevation 

 oblique to foliation, 454 



— on origin of lines of elevation, 

 469,592 



Hornblende-rock, fragments of, in 



gneiss, 423 

 Hornblende-schist, near M. Video, 



433 

 Horner, Mr., on a calcareo- animal 



substance, 62 



— on fusibility of feldspar, 138 

 Homos, Los, section near, 536 

 Hornstone, dike of, 456, 158 

 Horse, fossil tooth of , 326, 336 

 Huafo Island, 390, 406 



— subsidence at, 418 

 Huantajaya, mines of, 577 

 Hubbard, Dr., on dikes, 139 

 Humboldt, on ejected fragments, 



48 



— on obsidian formations, 72, 74 



— on sphserulites, 76 



— on parapets round craters, 94 



— on saline incrustations, 306 



— on foliations of gneiss, 421 



— on concretions in gneiss, 459 

 Hutton on amygdaloids, 18 

 Hyalite in decomposed trachyte, 29 



ICEBEKGS, action on cleavage, 

 458, 462 

 Iceland, stratification of the cir- 

 cumferential hills, 108 

 lllapele, section near, 535 

 Imperial, beds of shells near, 236 

 Incrustations, on St. Paul's rock, 

 38 



