482 
INDEX 
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 ungu- | 
lates, 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 
Cruciferse, variations of structure in, 
80 
Cuckoo, eggs of, 216 
Cuckoos mimick hawks, 263 
Cultivated plants, origin of useful, 
97 
Curculionkhe mimicked by various 
insects (figs.), 260 
Curves of variation, 64 
D 
Dana, Professor, on the permanence 
of continents, 342 
Danaidse 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 existence, 40 
on variability of wild geraniums, 
79 
on variability of common species, 
80 
his non-recognition of extreme 
variability of wild species, 82 
on races of domestic pigeon, 
90 
on constitutional variation in 
plants, 95 
on unconscious selection, 96 
on a case of divergence, 105 
on advantage of diversification 
of structure in inhabitants of 
one region, 110 
on species of plants in turf, 110 
on isolation, 119 
on origin of mammary glands, 
129 
on eyes of flatfish, 129 
on origin of the eye, 130 
on useless characters, 131 
on use of ears and tails, 136 
on disappearance of sports, 140 
on tendency to vary in one 
direction, 141 
on rare perpetuation of sports, 
142 
on utility of specific characters, 
142 (note) 
on importance of biological en¬ 
vironment, 148 
on variable fertility of plants, 
155 
on fertile hybrids among plants, 
164 
