animal, supposed causes of, 193
obscure, of many tropical animals, 194
produced by surrounding objects, 195
adaptations, local, 199
for recognition, 217
of wild animals not quite symmetrical, 217 (note)
as influenced by locality or climate, 228
development in butterflies, 274
more variable than habits, 278
and nerve distribution, 290
and tegumentary appendages, 291
of flowers, 308
change of, in flowers when fertilised, 317
in nature, concluding remarks on, 299, 333
of fruits, 304
of flowers growing together contrasted, 318
Complexity of flowers due to alternate adaptation to insect
and self-fertilisation, 328
Composite, a, widely dispersed without pappus, 367
Confinement, affecting fertility, 154
Continental and oceanic areas, 346
Continents and oceans cannot have changed places, 345
possible connections between, 349
Continuity does not prove identity of origin, 463
Cope, Dr. E.D., on non-adaptive characters, 131
on fundamental laws of growth, 420
on bathmism or growth-force, 421
on use producing structural change, 422
on law of centrifugal growth, 422
on origin of the feet of ungulates, 423
on action of animal intelligence, 425
Correlations in pigeons, horses, etc., 140
Corvus frugilegus, 2
corone, 2
Coursers, figures of secondary quills, 224
Cowslip, two forms of, 157
Crab, sexual diversity of colour of, 269
Cretaceous period, dicotyledons of, 400
Crisp, Dr., on variations of gall bladder and alimentary canal, 69
Crosses, a cause of variation, 99
reciprocal, 155
Cross-fertilisation, modes of securing, 310
difference in, 155
Crossing and changed conditions,
parallelism of, 166
Cruciferae, variations of structure in, 80
Cuckoo, eggs of, 216
Cuckoos mimick hawks, 263
Cultivated plants, origin of useful, 97
Curculionidae mimicked by various insects (figs.), 260
Curves of variation, 64
=D=
Dana, Professor, on the permanence of continents, 342
Danaidae little attacked by mites, 235
mimicry of, 246
Darwin, change of opinion effected by, 8
the Newton of Natural History, 9
his view of his own work, 10
on the enemies of plants, 16
on fir-trees destroyed by cattle, 17
on change of plants and animals caused by planting, 18
on absence of wild cattle in Paraguay, 19
on cats and red clover, 20
on variety of plants in old turf, 35
on the beneficent action of the struggle for exi
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