Index. 



331 



Darwin, on variation, 141, 146, 



149, 153 

 " on variation from 



crossing, 120, 122 



" on variation of species 



of large genera, 153 



Development often indirect, 24 



Dianthus, variability of hybrid, 



124 



Direct influence of external con- 

 ditions, 89 



Dog, reversion in, 10 

 " hybrids from, 131 

 " variation of, 91, 150 

 Domesticated animals more va- 

 riable than wild ones, 142 



Edmundston on sea-gull, 93 

 Education and culture, 272 

 Elephant, 205 

 Epigenesis, 20, 27 



and evolution, 24 

 Evadne, 58 

 Evolution and division of labor, 



313 



Bonnet on, 20 

 " of complicated or- 

 gans, 156 

 definitions of, 20 

 " Huxley on, 20 

 " hypothesis logically 



imperfect, 82 

 " morphological aspect 



of, 313 

 saltatory, 157, 296 



Falconer on variation of dog 



and goat, 91 



Female modification, 235 

 Fishes, sexual differences in, 



196 



Fish-lice, sexual differences in, 



177 



Fowls, hybrids from, 129, 131 

 " modification of female, 



222 

 " reversion in, 135 



Gall-wasp, parthenogenesis in, 

 62 



Gallus bankiva, reversion to, 

 135 



Galton on pangenesis, 53 

 " on saltatory evolution, 

 296 



Gartner on variability of hy- 

 brids, 120, 124 



Gegenbauer on nature of ovum, 

 28 



Gelassimus, 189 



Gemmules, 82 



Gerstaecker on parthenogene- 

 sis, 56 



Godine on hybrid sheep, 129 



Goose, inflexibility of, 142 



Haeckel on perigenesis, 33, 45 

 " on phylogeny of Me- 

 dusae, 304 

 ' ' on significance of onti- 



geny, 30 



Hagen on dimorphism of cray- 

 fish, 188 



Haller on evolution, 20 

 Huxley on evolution, 20 

 Harvey, 22 



Hemp, variation of, 90 

 Hen, parthenogenesis in, 67 

 Heredity, theory of, 16, 80 

 ' ' ontogenetic and phy- 



logenetic, 311 

 " and memory, 37 



