482 



INDEX 



Cope, Dr. E. D., on iion - adaptive 

 characters, 131 

 on fundaniental laws of growth, 



420 

 on bathniism or gi'owth-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 

 Curculionidfe mimicked by various 



insects (figs.), 260 

 Curves of variation, 64 



Dana, Professor, on the permanence 



of continents, 342 

 Danaid* 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 tiirf, 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 



