INDEX. 



AAR 



A ARDVAKKS, their burrows, 325 

 JJL Acacia latronum, or buffalo thorn, 

 thorns of the, 68 



tomentosa, jungle-nails of the, 68 

 Acalephse, or jelly-fishes, 125 



their internal structure, 126 



their mode of progression, 127 



alternations of their generations, 127 



ciliograde jelly-fishes, 128 

 their fishing apparatus, 129 



tubular acalephse, 129 



importance of acalephse in the eco- 



nomy of the ocean, 131 

 Acorn-shells, structure of, 175 



their habits, 176 



Actinia Alcyonoidea, 117 



Adelsberg, cave of, crustaceans of the, 



183 

 Aerolithes, 5 



enormous number of, 6 



substances of which they are com- 



posed, 6 



Africa, roots of plants of South, 56 

 Agalma Okenii, 129 

 Air, the atmospheric ocean, 16 



its component parts, 16 



constancy in its component parts, 16 



its purity maintained by the winds, 



17 



dependence of all terrestrial life upon 

 the actual constitution of the air, 18 



atmospheric air but a mixture, 19 



no chemical combination of oxygen 



and nitrogen, 19 



transparency of the air, 19 



its influence upon the mental deve- 



lopment of mankind, 19 



air considered as the bearer of sounds, 



19 



the atmospheric precipitations in 



their relation to organic nature, 27 



harmonies of the ocean and the at- 



mosphere, 27 



Albatross, his prodigious flight, 287 

 Aldebaran, constituents of the atmo- 

 sphere of, 8 

 Alluvial plains, formation of, 38, 39 



AVO 



Alpine-flea, 183 

 Alps, lavines of the, 33 



their importance to the verdure of the 



Alps, 34 



glaciers of the Alps, 34 

 Amaryllis, origin of the, in Europe, 91 

 Ammophila arundinacea, or sand-reed, 



its singular roots, 56 

 Amoeba, the, 102 

 Anabas, respiration of, 261 

 Angler-fish, its mode of taking its prey, 



263 



Anguis fragilis, its hybernation, 282 

 Animals, importance of oxygen to the 



life of, 16, 17 



antagonism between animal and vege- 



table life, 17 

 Annelida, 166 



See Worms 



Anolis, locomotion of the, 273 

 Ant-bear, tail of the, 337 



his masticatory organ s, 339 



his means of defence, 360 

 Ant-lion, larvae of the, 212 

 Ants, instincts of, 231 



their nests, 231 

 Apple, maggot of the, 219 

 Aquarium, an, 17 

 Aquatic insects, 199 

 Archer-fishes, their mode of taking their 



prey, 263 



Arctic regions, vegetables and animals 

 of the, 33 



influence of the snows of the, 33, 64 

 Armadillos, their burrows, 325 



their armour, 368 



Ascidise, solitary and compound, 145, 



146 

 Asteroidea, 132 



snake-stars, 133 



star-fishes, 134 



Astronomy, first step to the science of, 2 



knowledge of the Greeks, 3 



form and dimensions of the earth, 3 



the planetary system, 3 

 Ateuchus sacer, or sacred beetle, 221 

 Avoset, bill of the, 296 



