INDEX 



A. 

 Accident, Darwin's use of the 



word, 334-340 ; beauty due to, 



408, 409. 



Achromatin, 126-134. 

 Acquired characters, see Characters. 

 Acraa eurita, 328. 

 Adaptation, facts of, in relation 



to theory of natural selection, 



401-403, 411. 



Adaptive characters, see Characters. 

 ^Esthetic sense in animals, 380- 



385 ; see Beautiful. 

 Agassiz, Prof. A., on fauna of the 



Mammoth cave, 70. 

 Alpine plants, 209, 210, 440- 



442. 



Amauns mavius, 328. 

 Amblyornis inornata, 381-383. 

 Amphioxus, 137, 138, 145, 146. 

 Analogy, 38, 50-65, 176, 177, 



347-35- 



Anthropoid, see Apes. 



Antlers, 98-100, 167-169. 



Ants, co-operative instincts of, 

 268 ; leaf-cutting, 332 ; keeping 

 aphides, 292. 



Ape, eye of, 75 ; appendix vermi- 

 formis of, 84-86. 



Apes, ears of, compared with those 

 of man, 88; muscles of, 77, 82, 

 83; feet of, 77, 78; tail of, 

 compared with that of man, 

 82-84 ; hair of, compared with 

 that of man, 89-91 ; teeth of, 

 compared with those of man, 

 92-94; flattening of tibiae of, 



95. 96- 

 Aphides, 292. 



G 



Appendix vermiformis of man 

 compared with that of orang, 

 84-86. 



Apteryx, 68, 69. 



Archaopteryx, 171-173. 



Arctic plants, 209, 210, 440-442. 



Argyll, Duke of, on natural selec- 

 tion, 334-362. 



Aristotle, his idea of scientific 

 method, i ; on classification, 

 23, 24. 



Arm, distribution of hair on, in 

 man and apes, 89-92. 



Arthropoda, embryology of, 155. 



Artificial selection, analogy of, 

 to natural selection, 295-314: 



Sictorial representations of pro - 

 nets of, 298-312. 



Artiodactyls, 182-191. 



Association, principle of, in 

 aesthetics, 404-407. 



Aster, 129-133. 



Attraction-spheres, 128, 132, 133. 



Australia, fauna of, 204, 205 ; 

 thriving of exotic species in, 

 286 ; portrait of wild dog of, 



34- 

 Azores, 224, 225. 



B. 



Bacon, Lord, on scientific method, 2 . 

 Balanoglossus, 147, 148. 

 Baptanodon discus, posterior limb 



of, 179-181. 

 Barriers, in relation to geographical 



distribution, 216-224. 

 Bats, 56, 224, 226, 240. 

 Battle, law of, 385, 386. 

 Baya-bird, 381. 



