INDEX. 



Achtheres, 209 



Adaptation, 112, 122, 129, 194 



Adaptive change 260 



/Eolis, 228, 234 



/Etiology, 27 



Agassiz, 104, 197 



Air-bladder, 115^ seq. 



Algse, 58 



Allman, 74, 79 



Alternation of generations, 246 



Alytes, 238, 240 



Amblystoma, 242 et seq., 248 



Amoeba, 22, 46, 64, 65 et seq., 276 



Amphibia, 235 et seq. 



Amphioxus (see Lancelet) 



Analogy, 123 



Anchitherium, 94 



Ancon sheep, 148 



Angrosperms, 56 



Animals and plants, constitution of, 36 



Annulosa, 42 



Anoplotherium, 153 



Anted on, 198 



Antirrhinum, 83 



Antlia, 263 



Aphides, 246, 288 



Aphysia, 228 



Appendicularia, 176 



Apple, 141 



Apteryx, 87 



Apus, 2IO 



Aqueous rocks, 369 



Arachnida, 354 



Archseopteryx, 158 et seq. 



Archetype, 128 



Architroch, 235 



Arenicola, 231 



Aristotle, 38, 169 



Arius, 239 



Arm of man, 90, 109 



Arthropoda, 50, 268 



Articulata, 40, 42, 45, 51, 55 



Ascidians (see Sea-squirts) 



Ascula, 174 



Auricularia, 200 



Australian fauna, 27 



Axolotl, 236 et seq. , 242 et seq. , 248 



B 



Balani (see Sea-acorns) 



Balanoglossus, 55, 201 



Balfour, F. M., 236, 237 



Barnacle, 32 



Barnacle, development of, 203, 352 



Barramunda (see Ceratodus) 



" Beagle," voyage of, i 



Bear animalcule, 185, 271 



Beetles, 85 



Beryx, 346 



Biology, study of, 9, 14 



Bipinnaria, 196 



Birds and reptiles, affinity of, r 54 



Birds, development of, 179 



Birds fertilizing flowers, 335 



Birds, fossil, 157 



Blank periods in geology, 369 



Blastoderm, 169, 177 



Blood corpuscles, 73, 295 



Bone, structure of, 71 



Bonnet, 170, 183 



Botany, 14 



Botryllus, 288 



Brachiopoda, 230 



Bracts, 131, 132 



Branchial clefts (see Gill clefts) 



Brine shrimp, 209 



Browning, 150 



Brown-Sequard, 85 



Bubble-shells, 228 



