Index. 



331 



Darwin, on variation, 141, 146, 



149, 153 



" on variation from 



crossing, 120, 122 



" on variation of species 



of large genera, 153 



Development oflen 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, 273 

 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 



Gegenbauerou 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- 



dusse, 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 



