INDEX 



Achtheres percarum, 247 

 Adaptation, law of, 118 

 Aim not known in science, 425 

 Air-sacs in birds, 100 

 Alg», 236 

 Albumen, 237 

 Albuminoids, 231 

 Alpine hare, adaptation of, 54 

 American notions, 47 

 Amcebse, 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, 207-13 

 Ants, 285-6 



Archaeopteryx, 39, 121, 157 

 Arctic hare, evolution of the, 32, 54 

 Argus butterfly, the, 195 

 Aristolochia, 200 

 Art, analysis of, 71 



„ animal destitute of, 71 

 Articulates, 184 

 Artificial selection, 29, 166 

 Asexual germ-cells, 302 

 Atoms, 365 



Attention in animals, 76 

 Aulostomum gulo, 268 



Bacillus, adaptation of the, ZTz 



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 



Bilharzia fiamatobia, 282 



Bioccenosis, 23, 42 



Biogenetic law, the, 171, 247 



Biogens, 232-4, 311 



,, evolution of the, 317 



Bird, anatomy of the, 100 

 ,, 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 



Bombycidse, the, 159 



Bothriocefihalus latus, 282 



Brain 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 

 Caprifoliacese, 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, 1S8 

 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 

 Chafiinch, 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 



