INDEX 



A. 



Accident, Darwin's use of the 



word, 334-340 ; beauty due to, 



408, 409. 

 Achromatin, 126-134. 

 Acquired characters, 5^« Characters. 

 Acrcea eurita, 328. 

 Adaptation, facts of, in relation 



to theory of natural selection, 



401-403. 411. 

 Adaptive characters, je^Characters. 

 Esthetic sense in animals, 380- 



385 ; see lieautiful. 

 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, 



347-350- 



Anthropoid, see Apes. 



Antlers, 9S-100, 167-169. 



Ants, co-operative instincts of, 

 26S ; leaf-cutting, 332 ; keeping 

 aphides, 292. 



Ape, eye of, 75 ; appendix vermi 

 formis of, 84-S6. 



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. 



Appendix vej-miforniis of man 

 compared with that of orang. 

 84-86. 



Apteryx, 68, 69. 



Archceopteryx, 1 71-173. 



Arctic plants, 2:9, 210, 440-442. 



Argyll, Duke of on natural selec- 

 tion, 334-362. 



Aristotle, his idea of scientific 

 method, 1 ; on classification, 

 23, 24. 



Arm, distribution of hair on, in 

 man and apes, S9-92. 



Arthropoda, embryology of, 155. 



Artificial selection, analogy of, 

 to natural selection, 295-314: 

 pictorial representations of pro- 

 ducts of, 29S-31 2. 



Artiodactyls, 182-191. 



Association, principle of, in 

 aesthetics, 404-407. 



Aster, 129-133. 



Attraction-spheres, 128, 132, 133. 



Austialia, fauna of, 204, 20,^ ; 

 thriving of exotic species in, 

 286 ; portrait of wild dog of, 



304- 

 Azores, 224, 225. 



B. 



Bacon , Lord , on scientific method , 2 . 

 Balanoglossiis, 147, 148. 

 Bapta7iodon 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. 



1 



