INDEX 



Achtheres pcrcarum, 247 



Adaptation, law of, 118 



&-irrrmJt known in science, 425 

 ""Air-sacs in birds, 100 



Algae, 236 



Albumen, 237 



Albuminoids, 231 



Alpine hare, adaptation of, 54 



American notions, 47 



Amoebae, 292, 294 



Amphimixis, uses of, 256-61 



Analysis, chemical, 231 



,, the task of science, 396 



Angiosperms, 236 



Annelides, 264 



Antennae of the Crustacea, 245 



Antlers, 84, 89 



of the giant stag, 207- 1 3 



Ants, 285-6 

 "SKTiaeopteryx, 39, 121, 157 



Arctic hare, evolution of the, 32, 54 



Argus butterfly, the, 195 



Aristolochia, 200 



A.rt, analysis of, 71 

 "" animal destitute of, 71 



Articulates, 184 



Artificial selection, 29, 166 



Asexual germ-cells, 302 



Atoms, 365 



Attention in animals, 76 

 ' A ulostomum gulo, 268 



BACILLUS, adaptation of the, 373 



Bacteria, nitrogenous, 318 



Balloons, birds dropped from, 102 



Barbel, the, 176 



Basic particles in the germ, 319 



Bee hawk-moth, the, 194 

 ,, queens and workers, 213 

 ,, state, origin of the, 214 



Bees and plants, 200 



"Beetles, wings of, 203 



Beyond-man, the, 417 



TZilTiarzia h<zmatobia, 282 



Bioccenosis, 23, 42 



Biogenetic law, the, 171, 247 



Biogens, 232-4, 311 



,, evolution of the, 317 



Bird, anatomy of the, 100 

 77- evolution of the, 38, 136 



life of the, 52 



song of the, 78, 94-6 



soul of the, 79 

 Bittern, the, 96 

 Black-arches, the, 43, 160 

 Blackbird, the, 48 

 Black-cock, the, 85, 87 

 Blue-throat, the, 107 

 Bombycidae, the, 159 

 Bothriocephalus latus, 282 

 T5rain and mind, 384 



,, development of the, 249 

 Branchiopods, 254 

 Brontosaurus, the, 120 

 Bullfinch, the, 81-2 

 Bull-head, the, 173, 174 

 Buttel-Reepen on the bees, 214 

 Butterflies, 187, 189-93 



CABBAGE-BUTTERFLY, the, 195 

 Callima, 194 

 Caprifoliaceae, 200 

 Caracoideum, the, 158 

 Carp, eggs of the, 26 

 Cast of the skin in insects, 187 

 Cat and the mouse, 67, 68 

 ,, why its fur stands out, 88 

 Caterpillars, 188 

 Catholic clergy, 415 

 Causation, infinity of, 361 

 Cause and effect, 349 

 Celibacy, evils of, 415 

 Cell, the, 289 



cleavage of the, 294 

 Cellular animals, 319 

 Cellulose, 237 

 Cetiosaurus, the, 120 

 Chaffinch, the, 48 

 Chance, 353 



Change of function in organs, 244 

 of hosts in parasites, 275 

 Chlorophyll, 235, 317 

 Choice, female, 80-7, 95 

 Chromatin, 289 

 Classification of animals, 117 

 Co-adaptations, 207 

 429 



