252 



INDEX OF SUBJECTS 



Dasypus, polyembryony 4 2 



Dianthoecia, fixed and variable 



species 2 S 



Disease-resistance 87 



Division, power of, a fundamental 



attribute of living things 38 



Genetics of 4°. 50 



Dogger Bank, large varieties on. . . 125 



Dogs, hybrid 242 



Dominance, nature of 95 



Dominants, origin of new ... 88, 90, 95 



Double monsters 4 2 



Draba, experiments with 243 



Drosophila 82, 91 



Payne's experiments on 229 



Earthworm, regeneration 77 



Elephant, tusk segmented 38 



Entelechy 80 



Environmental treatment, effects 



of 188, et seq. 



Enzymes and genetic factors 86 



Epilepsy, inheritance of traumatic. 197 



Equidae, sterility of hybrid 242 



Erophila, experiments with 243 



species 250 



Exacum, right and left 57 



Euphonia elegantissima , local forms 120 

 Eupithecia rectangulata, melanic 



form 137 



Factors, new 88 



loss of 96 



Factorial representation of varieties 



158, 165 



Falcons, geographical races 147 



Fasciation 49 



Ferments, Boyle on 54 



Finger-prints of twins 44 



Fixity and Variability in species. . 25 



Flax, climatic experiments 197 



Fowl, Silky 84 



Leghorn 85, 90 



Dominant white 94 



Wyandotte 97 



Rumpless 4° 



Foxes, incompatibility with dogs. . 242 



Free-martin 44 



Fringillidae, sterility of hybrid 242 



Fundulus, cyclopian 50 



Gallus, invariability of wild species 13 

 and origin of poultry 90, 97 



Genitalia, a basis for classification 

 in insects ... 13 



Gentians, climatic experiments. . . . 197 



Geometrical structure and differen- 

 tiation 54. 5° 



Geometrical distinction between 



germ-cells and somatic cells 58 



Gladiolus, right and left 57 



Gnophus obscurata, protective col- 

 ouring 141 



Goldfinch, geographical races 147 



Gonioctena variabilis, variation in 



sexes of I21 



Gouldian Finch, polymorphism, 148, 149 

 Giacilaria stigmatella, experiments 



on 193 



Grantia, large varieties of 125 



Ground-Squirrels, local forms of . . . 132 



Grouse, red, variation 29 



Guillemot, Ringed 150 



Guinea-pig, Brown-Sequard's ex- 

 periments on 198 



Gynandromorphs 45 



Heliconius erato, forms of . . . . 122, 164 



Helix lapicida, local variation of . . 126 



striata 127 



Heripensis 127 



Caespitum 127 



trochoides 127 



nemoralis and hortensis 128 



Helminthophila, geographical races 



of 157 



Hemerophila abruptaria, melanic. . 142 



Hepialus humuli, in Shetland 119 



Heterostyle plants 237 



Hieracium 9 



Himantopus 235 



Homocosis °8 



Hybernia progemmaria 139 



Hybrids, sterility of 234 et seq. 



Incompatibility between certain 



allied species 240 



Individual, geometrical indepen- 

 dence of 58 



Inhibiting Factors 95 



Intermediates, nature of 131. 135 



Isolation, consequences of 118 



Lacerta muralis, Kammerer's ex- 

 periments on 209 



fiumana 210 



Leptinotarsa, Tower's experiments 



on 219 



Limbs, extra, in pairs 72, 82 



Limnaea, sinistral 134 



Linaria vulgaris, self-sterility 240 



Loasa fruits, right and left 57 



Lobster, extra claws 76 



Locality, variation connected with 



14, 118, 146, et seq., 209 

 Lumbricus, regeneration 77 



