INDEX. 



[The numbers refer to the paragraphs.] 



Acephals 286 



Acrogens 250 



Adaptation 282 



JEpiornis maximus 421 



Agate 114 



Ages, boundaries of 262 



Ages of Man, Stone, Bronze, 



andiron 420 



Aiguille de Dree 146 



Alabaster 60 



Albite 129 



Alga? 249 



Alum 109 



Alumina 126 



Alumina, phosphates of. 110 



Alumina, silicates of 128 



Amber 45 



Amethyst 113 



Amianthus 125 



Ammonites 344, 352, 363 



Ammonium, chlorid of. 108 



Amorphous minerals 21 



Amygdaloid 152 



Anoplotherium 382 



Anticlinal lines 219 



Antimony 84 



Antimony, sulphuret of. 54 



Anthracite 39 



Anthracite, how produced.... 315 

 Anthracite, introduction of... 308 

 Ants, as geological workers.. 235 



Aqueous rocks 211 



Arenaceous rocks 145 



Argillaceous rocks 145 



Arsenic, sulphurets of 55 



Articulata 259, 332 



Asbestos 125 



Asphaltum 46 



Asterolepis 301 



Astronomy, Geology com- 

 pared with 425 



Atmosphere, relation of to 



coal 43T 



Atolls 238 



Auvergne, volcanoes of 386 



Azoic time 261 



Azoic age, heat and light in 271 



Azoic age, land of. 266, 267 



Azoic age, rocks of 270 



Barrier reefs 237 



Baryta, sulphate of. 62 



Basalt 152 



Basilosaurus 381 



Basins 387 



Belemnites 352 



Beryls 135 



Bismuth 87 



Bitumen 46 



Blackjack 57 



Boracite 107 



Borax 99 



Boulders 393 



Brachiopods 286 



Breccia 143 



Brontozourn giganteum 346 



Bryozoa 284 



Buhrstone 150 



Cainozoic time 261 



Cainozoic time, divisions of.. 368 



Calamites 32 



Calcaire grossier 369 



Calcareous rocks 145 



