INDEX. 



ABEL 



ABEL, M., on calcareous casts at 

 the Cape of Good Hope, 163 

 Abich on a new variety of feldspar, 



479 

 Abingdon Island, 118 

 Abrolhos Islands, 425 



— incrustation on, 38 



Absence of recent formations on 

 the S. American coasts, 414 



Acosta on an earthquake- wave, 

 472 



Aeriform explosions at Ascension, 

 45 



Agiierros on elevation of Imperial, 

 236 



Albatross, driven from St. Helena, 

 103 



Albemarle Island, 117 



Albite at the Galapagos Archi- 

 pelago, 118 



— constituent mineral in andesite, 

 478 



— in rocks of T. del Fuego, 445 



— in porphyries, 474 



— crystals of, with orthite, 479 

 Alison, Mr., on elevation of Val- 

 paraiso, 239, 244 



Alumina, sulphate of, 553 

 Ammonites from Conception, 399, 



407 

 Amolanas, Las, 559 

 Amygdaloidal cells, half filled, 31 

 Anivgdaloid, curious varieties of, 



474 

 Amvgdaloids, calcareous origin of, 



18 



AUSTEALIA 



Amygdaloids of the Uspallata 

 range, 522 



— of Copiapo, 567 

 Andesite of Chile, 478 



— in the valley of Maypu, 483, 

 485 



— of the Cumbre Pass, 502, 513 



— of the Uspallata range, 529 



— of Los Hornos, 538 



— of Copiapo, 551, 557, 567 

 Anhvdrite, concretions of, 486, 



509 

 Araucaria, silicified wood of, 391, 



527 

 Arica, elevation of, 265 

 Arqueros, mines of, 540 

 Ascension, 40 



— arborescent incrustation on 

 rocks of, 38 



— absence of dikes, freedom from 

 volcanic action, and state of 

 lava-streams, 105 



— gypsum deposited on, 273 



— lamiDated volcanic rocks of, 

 466, 469 



Ascidia, extinction of, 159 

 Atlantic Ocean, new volcanic 



focus in, 104 

 Augite fused, 125 



— in fragments, in gneiss, 423 



— with albite, in lava, 480 

 Austen, Mr. R. A. C, on bent 



cleavage lamina, 457 

 Austin, Capt.. on sea-bottom, 230 

 Australia, 146 



— foliated rocks of, 464 



