Index. 



639 



INCRUSTATIONS 



Incrustations, calcareous, at As- 

 cension, 58 



— saline, 306 



Infusoria in Panipean formation, 

 315, 321,328,333 



— in Patagonian formation, 371, 

 373, 374, 385, 386 



Iodine, salts of, 307, 309 

 Iquique, elevation of, 265 



— saliferous deposits of, 302 



— cretaceo-oolitic formation of, 

 577 



Iron, oxide of, in lavas, 508, 569 



— in sedimentary beds, 536, 540 



— tendency in, to produce hollow 

 concretions, 396 



— sulphate of, 553 



Isabelle, M., on volcanic rocks of 



Banda Oriental, 343 

 Islands, volcanic, distribution of, 



140 



— their elevation, 144 



J AGO, St., 3 

 James Island, 119, 122, 131 

 Jasper, origin of, 52 

 Joints in clay slate, 447 

 Jonnes, M. Moreau de, on craters 



affected by wind, 42 

 Juan Fernandez, 144 

 Jukes, Mr., on cleavage in New- 

 foundland, 463 



KAMTSCHATKA, andesite of, 

 480 

 Kane, Dr., on the production of 



carbonate of soda, 274 

 Keilhau, M., on granite, 167 

 Kicker Rock, 114 

 King George's Sound, 160 

 — calcareous beds of, 248 



LABRADOR feldspar, ejected, 47 

 Lakes, origin of, 227 

 — fresh- water, near salt lakes, 311 

 Lamination of volcanic rocks, 74 

 Land-shells, extinct at St. Helena, 

 101 



LONSDALE 



Lanzarote, calcareous beds of, 100 

 Lava, adhesion to sides of a gorge, 

 20 



— feldspathic, 24 



— with cells semi-amygdaloidal, 

 31 



— basaltic, of S. Cruz, 381 



— claystone porphyry, at Chiloe, 

 392 



— claystone, ancient submarine, 

 477 



— basaltic, of the Portillo range, 

 497 



— feldspathic, of the Cumbre 

 Pass, 508 



— submarine, of the Uspallata 

 range, 522, 525, 531 



— basaltic, of the Uspallata 

 range, 528 



— submarine, of Coquimbo, 544, 

 547 



— of Copiapo, 554, 565, 569 

 Lavas, specific gravity of, 132, 140 

 Lava-streams, blending together 



at St. Jago, 20 



— composition of surface of, 73 



— with irregular hummocks at 

 Ascension, 111 



— heaved up into hillocks at the 

 Galapagos Archipelago, 116 



— their fluidity, 117, 119 



— extreme thinness of, 125 



— differences in the state of their 

 surfaces, 133 



Lead, separation from silver, 134 

 Lemus Island, 389, 406 

 Lemuy Islet, 391 



Lesson, M., on craters at Ascen- 

 sion, 42 

 Leucite, 118 

 Lignite of Chiloe, 392 



— of Concepcion, 397 

 Lima, elevation of, 266 



Lime, sulphate of, at Ascension, 59 



— muriate of, 275, 302, 306 

 Limestone of Cumbre Pass, 506 



— of Coquimbo, 542, 546 



— of Copiapo, 560 

 Littorina (fossil), 171 

 Lonsdale, Mr., on fossil corals from 



Van Diemen's Land, 155, 178 



