structure, 81.
Assumptions of Mr. Darwin, 16.
Astronomical objections, 136.
Auditory organ, 74.
Augustin, St., 17, 263, 264.
Aurelius, Marcus, 206.
Avian limb, 106.
Avicularia, 80.
Axolotl, 165.
Aye-Aye, 107.
Aylesbury ducks, 234.

B.
Backbone, 135, 162.
Bacon, Roger, 266.
Baleen, 40.
Bamboo insect, 33.
Bandicoot, 67.
Bartlett, Mr. A. D., 126, 234.
Bartlett, Mr. E., 192.
Basil, St., 17.
Bastian, Dr. H. Charlton, 115, 219, 237, 266.
Bat, wing of, 64.
Bates, Mr., 29, 85, 87.
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Bats, 108.
Beaks, 83.
Beasts, sufferings of, 260.
Beauty of shell-fish, 54.
Bee orchid, 55.
Bird, wings of, 64.
Birds compared with reptiles, 70.
Bird's-head processes, 80.
Birds of Paradise, 90.
Birth of individual and species, 2.
Bivalves, 79.
Black sheep, 122.
Black-shouldered peacock, 100.
Bladebone, 70.
Blood-vessels, 182.
Blyth, Mr., 100, 181.
Bones of skull, 153.
Bonnet, M., 217.
Borwick, Mr., 198.
"Boots" of pigeons, 181.
Breathing, modified power of, 99.
Breeding of lions, 234.
Brill, 37.
Broccoli, variety of, 100.
Bryozoa, 81.
Buchner, Dr., 273.
Budd, Dr. W., 183.
Buffon, 217.
Bull-dog's instinct, 260.
Burt, Prof. Wilder, 180, 184.
Butterflies, 29.
Butterflies, Amazonian, 85.
Butterflies, American, 29.
Butterflies of Indian region, 83.
Butterflies, tails of, 85.
Butterfly, Leaf, 31.

C.
Cacotus, 149.
Caecum, 83.
Calamaries, 77.
Cambrian deposits, 137.
Cape ant-eater, 174.
Care of aged, 192.
Carinate birds, 70.
Carnivora, 68.
Carnivorous dentition, 110.
Carp fishes, 146.
Carpal bones, 106, 178.
Carpenter, Dr., 115.
Carpus, 177, 178.
Cases of conscience, 201.
Cassowary, 70.
Catasetum, 56.
Causes of spread of Darwinism, 10.
Cebus, 226.
Celebes, butterflies of, 85.
Centetes, 148.
Centipede, 66, 159.
Cephalopoda, 74.
Ceroxylus laceratus, 36.
Cetacea, 42, 83, 105, 108, 174.
Chances against few individuals, 57.
Characinidae, 146.
Cheirogaleus, 158.
Chetahs, 234.
Chickens, mortality of hybrids, 124.
Chioglossa, 165.
Chiromys, 107.
Cholera, 192.
Choroid, 76.
Chronic rheumatism, 183.
Circumcision, 212.
Clarias, 146.
Climate, effects of, 98.
Climbing plants, 107.
Clock-thinking illustration, 249.
Cobra, 50.
Cockle, 79.
Cod, 39.
Colloidal matter, 26