634 



Index. 



DIKES 



Dikes in gneiss of Brazil, 423, 429 



— near Rio de Janeiro, 428 



— pseudo-, at Port Desire, 439 



— in T. del Fuego, 413 



— in Chonos Archipelago, con- 

 taining quartz, 455 



— near Concepcion, with quartz, 

 458 



— granitic porphyritic, at Valpa- 

 raiso, 459 



■ — rarely vesicular in Cordillera, 

 480 



— absent in the central ridges of 

 the Portillo Pass, 489 



— of the Portillo range, with 

 grains of quartz, 496 



— intersecting each other often, 

 513 



— numerous at Copiapo, 567 

 Dislocations at Ascension, 46 



— at St. Helena, 89 

 Distribution of volcanic islands, 



140 

 Dolimieu on decomposed trachyte, 

 29 



— on obsidian, 72, 73 



— on laminated lava, 7*», 77 

 Domeyko, M., on the silver mines 



of Coquimbo, 541 



— on the fossils of Coquimbo. 548 

 D'Orbigny. M.A., on upraised shells 



of Monte Video, 190 



— on elevated shells at St. Pedro, 

 191 



— on elevated shells near B. Avres, 

 193 



— on elevation of S Bias. 196 



— on the sudden elevation of La 

 Plata. 215 



— on elevated shells near Cobija, 

 264 



— on elevated shells near Arica, 

 265 



— on the climate of Peru, 268 



— on salt deposits of Cobija, 302 



— on ervstals of gypsum in salt- 

 lakes, 310 



— on absence of gypsum in the 

 Pampean formation, 317 



— on fossil remains from Bahia 

 Blanca, 327, 329 



EDMOXSTON 



D'Orbigny, M.A., on fossil remains 

 from the banks of the Parana, 

 332 



— on the geology of St. Fe, 334 



— on the age of Pampean forma- 

 tion, 341, 356 



— on the Mastodon Andium, 362 



— on the geology of the Rio Negro, 

 370 



— on the character of Patagonian 

 fossils, 386 



— on fossils from Concepcion, 400 



— on fossils from Coquimbo, 405 



— on fossils from Payta, 406 



— on fossil tertiary shells of Chile, 

 409 



— on cretaceous fossils of T. del 

 Fuego, 443 



— on cretaceous fossils from the 

 Cordillera of Chile, 490, 511, 548, 

 551, 560, 578 



Dree, M., on crystals sinking in 

 lava, 133 



Dufrenoy, M., on the composition 

 of the surface of certain lava- 

 streams. 73, 133 



— on the inclination of tuff-strata, 

 121 



EARTH, marine origin of, 234, 

 241 

 Earthenware, fossil, 270 

 Earthquake, effect of, at S. Maria, 

 216 



— elevation during, at Lemus, 232 



— of 1822, at Valparaiso, 244 



— effects of, in shattering sur- 

 face, 269 



— fissures made by, 269 



— probable effects on cleavage, 

 269 



Earthquakes in Pampas, 211 

 Earthquake-waves, power of, in 

 throwing up shells, 244 



— effects of, near Lima. 273 



— power of, in transporting boul- 

 ders, 301 



Edmonston, Mr., on depths at 

 which shells live at Valparaiso, 

 244 



