INDEX OF SUBJECTS

PAGE
Abraxa grossulariata,[105], [193]
Aceras hircina, local variability,[123]
Achatinellidae, local forms of,[133]
Acquired characters, inheritance of,[188 et seq.], [217], [233]
Acronycta psi, melanic,[138]
Adaptation, problem of,[187], [234]
Agelaius, local forms,[120]
Agrotis, fixed and variable species,[ 25]
Alkaptonuria,[ 83]
Alpine Plants, growing larger, if protected,[183]
Alpine Varieties,[165]
Alytes obstetricans, Kammerer's experiments on,[199], [210]
Amblystoma, races of,[230]
Amphidasys betularia, melanic form,[136], [138]
 dimorphic larvae,[141]
Anodonta, polymorphism of,[130]
Antirrhinum, striped,[ 57]
 species-hybrids,[ 99]
 albinos,[110]
Apple, will not cross with pear,[239]
Arctia caja, effects of temperature,[192]
 larval variation in,[231]
Arctic varieties,[165]
Argynnis paphia and valesina in Italy,[121]
Armadillo, polyembryony,[ 42]
Artistic faculty,[ 89]
Arum, rights and lefts,[ 57]
Auriculas, short-styled selected,[236]
Axis of symmetry in hand and foot,[ 48]
Axolotl, alleged effect of conditions,[230]
Azalea, bud-sports,[ 55]

Bacillus anthracis, unsegmented form,

[ 71]
Bacillus prodigiosus, variation in,[213]
Bacteria, variation in,[212]
Bacterium coli, variation in,[214]
Baeolophus, geographical races of,[159]
Barley, right and left-handed,[ 58]
Basilarchia, geographical races of,[161]
Begonia phyllomaniaca,[ 50]
 hybrids,[ 51]
Bizarre Carnation, genetics of,[ 54]
Black, as a variation from red,[148]
Blackbird, varying,[150]
Black Cock, fixity of,[ 28]
Boarmia repandata, melanic form,[136]
 rhomboidaria,[137], [139]
Botrytis susceptibility to,[108]
Bovidae, hybrid,[242]
Brachydactyly,[ 89], [ 95]
Bradypus, vertebral variation,[ 68]
Bud-sports geometrically irregular,[54-57]
Buffalo, attempts to hybridize,[242]
Bullfinch, gynandromorph,[ 45]
Bulimus detritus, local variation of,[126]

Canary, asymmetrical markings in,

[154]
Canidae, hybrid,[241]
Capsella,[100]
Cardamine pratensis,[239]
Cat, Polydactylism,[ 53]
Carnation, Picotees and bizarres compared,[ 54], [ 58]
Cataract, hereditary,[ 89]
Certhiola, melanic,[142]
Chladni figures,[ 60]
Choloepus, vertebral variation in,[ 68]
 local variation in,[119]
Cinerarias, self-sterility in,[238]
Cistudo, local variation in,[119]
Climatic varieties,[164]
Coccaceae, variation in,[213]
Coenonympha arcania, climatic forms of,[179]
 satyrion,[180]
Coereba, melanic,[142]
Colaptes, geographical races,[147 et seq.]
 chrysoides,[154]
Colloids, growth in,[ 65]
Colorado beetles, experiments on,[218]
Colour blindness in twins,[ 44]
Continuous variation, possible example of,[173]
Coracias, geographical races of,[160]
Cotton, genetics of,[ 98], [100]
Coupling,[110]
Crab, extra claws,[ 74]
Crustacean appendages and Serial Homology,[ 63]
Crystals, analogy with,[ 78]
Cyclopian monsters, artificial,[ 50]

Daphnia, changed by environment,

[217]
Dasypus, polyembryony,[ 42]
Dianthoecia, fixed and variable species,[ 25]
Disease-resistance,[ 87]
Division, power of,
 a fundamental attribute of living things,[ 38]
 Genetics of,[ 46], [ 50]
Dogger Bank, large varieties on,[125]
Dogs, hybrid,[241]
Dominance, nature of,[ 95]
Dominants, origin of new,[ 88], [ 90], [ 95]
Double monsters,[ 42]
Draba, experiments with,[242]
Drosophila,[ 91]
 Payne's experiments on,[228]

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,[241]
Erophila, experiments with,[242]
 species,[249]
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,[ 46]
Foxes, incompatibility with dogs,[241]
Free-martin,[ 44]
Fringillidae, sterility of hybrid,[241]
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 differentiation,[ 54], [ 56]
Geometrical distinction between germ-cells and somatic cells,[ 58]
Gladiolus, right and left,[ 57]
Gnophus obscurata, protective colouring,[141]
Goldfinch, geographical races,[147]
Gonioctena variabilis, variation in sexes of,[121]
Gouldian Finch, polymorphism,[148-149]
Gracilaria 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-Séquard's experiments 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,[236]
Hieracium,[ 9]
Himantopus,[234]
Homoeosis,[ 68]
Hybernia progemmaria,[139]
Hybrids, sterility of,[233 et seq.]

Incompatibility between certain allied species,

[239]
Individual, geometrical independence of,[ 58]
Inhibiting Factors,[ 95]
Intermediates, nature of,[131], [135]
Isolation, consequences of,[118]

Lacerta muralis, Kammerer's experiments on,

[209]
 fiumana,[210]
Leptinotarsa, Power's experiments on,[218]
Limbs, extra, in pairs,[ 72]
Limnaea, sinistral,[134]
Linaria vulgaris, self-sterility,[239]
Loasa fruits, right and left,[ 57]
Lobster, extra claws,[ 76]
Locality, variation connected with,[ 14], [118], [146 et seq.], [208]
Lumbricus, regeneration,[ 77]
Lychnis dioica and vespertina, inter-relations of,[ 18]
 macrocarpa, possibly a common parent of,[ 19]

Machetes pugnax, polymorphism of male,

[ 28]
Maize, Blaringhem's experiments on,[229]
Maize, cumulative factors in,[116]
Malformations, dominants, arising de novo,[ 89]
Manx Cat, heredity,[ 46]
Matthiola,[ 84], [104], [113]
Melanic varieties,[135 et seq.]
Memory, analogy with heredity,[190]
Meristic variation,[ 69], [ 83], [ 86]
Mirabilis, striped,[ 57]
Models of segmentation,[ 59], [ 60]
"Modes," Coutagne's conception of,[126]
Mödling, peculiar race of Pieris napi at,[178]
Mole, albino,[27-28]
Mule, Linnaeus on,[ 8]
Mutation, Matthioli on,[ 4]
 in Mercurialis,[ 5]
 in Kales,[ 5]
 alleged in bulbs,[ 5]
 Theory,[ 97]
 periods of,[114]
 in Bacteria,[214]
Mutilation, consequences of,[ 71]
 alleged effect of, on offspring,[229]
Myxococcus, variation in,[213]

Narwhal, asymmetry of tusks,

[ 44]
Nemesia strumosa,[ 91]
Neuration, a basis for classification,[ 13]
Nicotiana, sterility of hybrid,[242]
Nightjars, varying,[150]
Noctuidae, fixity and variability,[ 25]
Noctua, polymorphic and fixed species,[ 25]
Noctua castanea, local forms of,[122]
Nomenclature, future of,[ 94], [245]
Notonecta, variations of,[130]

Odontoptera bidentata, melanic form,

[137]
Oedipodidae, protectively coloured,[140]
Oenothera, new dominant in,[ 92]
 rubricalyx and rubrinervis,[ 92], [ 95]
 Lamarckiana,[ 92], [101]
 origin of,[102], [244]
 has bad pollen-grains,[102]
 factorial analysis of,[103]
 pollen and egg-cells genetically dissimilar,[104]
Oenothera, "twin hybrids",[105]
 laeta and velutina,[105]
 reciprocal crosses in,[105 et seq.]
 possible coupling in,[111]
 dwarfs,[112], [114]
 "Triple hybrids",[114]
 alleged variation due to treatment,[227]
Ophrys, local variability,[125]
Orange, polyembryony,[ 45]
Osmotic growth,[ 65]
Overlapping forms,[146], [174]

Papilio, geographical races of,

[162]
Papilio turnus, variation of,[144]
Pararge egeria, geographical forms,[166 et seq.]
Parthenogenesis,[ 50]
Partula, local forms of,[133]
Passer domesticus and montanus, distinctions,[ 22]
Pea, round and wrinkled,[ 95]
Pear, will not cross with apple,[239]
Pelargonium, variegated,[ 55]
 bud-sports,[ 56]
Periodic phenomena in structure,[ 63]
Peronea, fixed and variable species,[ 26]
"Petites espèces",[248]
Petunia, double,[104]
Phalanger maculatus, local variation,[119]
Pheasant, fixity of,[ 29]
Phigalia pilosaria, melanic,[139-140]
Phratora vitellinae, experiments on,[193]
Phyllotaxis,[ 69]
Pied varieties common in Passer domesticus unknown in Montanus,[ 23]
Pieris napi and bryoniae,[174]
Pig, mule-footed,[ 46]
Pigeon, web-footed,[ 46], [ 49]
 Indian Rock, a recessive form,[ 98]
Pigments, nature of,[ 83]
Pisum humile, hybrids with culinary peas,[244]
 species,[246]
Planarian, regeneration of,[ 71], [ 77]
Plotheia frontalis, polymorphic,[ 26], [ 29]
Plusia, fixity and variation in,[ 26]
Poephila gouldiae, variation of,[148-149]
Polarity of individual,[ 44]
Polia chi, melanic,[138]
Polyanthus, short-styled selected,[236]
Polydactylism in Cat,[52-53]
Polyembryony,[ 45]
Potato, variation in,[ 91]
Poultry, evolution of,[ 90]
Primula obconica,[ 91]
Primula sinensis, flaked,[ 57]
 Leaf-shapes,[ 70]
 new dominant in,[ 92]
 sterility in,[236]
 "Giants",[236]
Primula, species-hybrids,[242]
Protective coloration,[140]
Pyrrhulagra, local forms,[120]
Python, twin-vertebrae,[ 60]

Quiscalus, geographical races of,

[156]

Rabbit, Angora,

[ 46]
 colours of,[ 93]
 Incompatibility with hare,[242]
Raimannia odorata, Macdougal's experiments on,[226]
Rats, Variation in,[248]
Recessives, origin of,[ 90]
Reciprocal crosses, giving distinct results,[105 et seq.]
Regeneration,[ 70]
Repulsion,[110]
Reversal on Regeneration,[ 77]
Rhamphocoelus, geographical forms,[159], [184]
Rhinoptera, variation in jaws of,[ 38]
Rhythm in repetition,[ 69]
Ribs, variation of,[ 68]
Rights and Lefts,[57-58]
Ripples, analogous to segments,[ 60], [ 66-67]
 regeneration of,[ 79]
Rollers, geographical races of,[160]
Ruff, polymorphism of male,[ 28]

Salamandra, maculosa and atra,

[182], [199], [203]
 spotted and striped,[207]
 geographical variation of,[208]
Segmentation, nature of,[ 63]
 simulated mechanically,[ 64]
 compared with rippling,[ 65]
 analogies with,[ 68]
Segmentation of normally unsegmented structures,[ 38]
Selection, Natural, an insufficient cause of definiteness of types,[ 17], [134], [142]
Sempervivum,[250]
Serial Homology, the true nature of,[ 62], [ 66]
Setina, Alpine varieties,[181]
Sex of Twins,[ 44]
Sex-factors, possible coupling of,[111]
Sexual characters, variation in,[119 et seq.]
Siamese twins,[ 44]
Silky Fowl,[84-85]
Simocephalus, changed by environment,[218]
Sinistral forms,[33-34]
Situs transversus,[ 43]
Skate's jaws, variation in,[ 38]
Sloths, vertebral variation,[ 68]
Species, conceptions of,[ 3], [ 94], [ 99], [240], [245]
 allied, distribution of,[185]
 alternative uses of the term,[245]
Specific difference, universality of,[ 12]
 of organisms compared with those of inorganic materials,[ 15]
 failure of theory of Selection to explain,[ 18], [134], [247]
Sphyropicus varius,[149], [156]
Spilosoma lubricipeda, varieties of,[181]
 Zatima, Heligoland form,[181]
Spinal nerves, segmentation of,[ 67]
Sporadic variation,[131], [134], [248]
Squashes, polymorphism of,[100]
Staphylococcus pyogenes, variation in,[213]
Sterility of hybrids, in general,[233]
 in Lychnis hybrids,[20 et seq.]
 in crossing forms of Draba,[243]
 Significance of,[244]
 Self,[238]
Stilt,[234]
Stocks,[ 84], [104], [113]
Striped varieties,[ 57]
Substantive variation,[ 84]
Subtraction-stages,[ 93]
Supernumerary limbs,[72-76]
Sweet pea, variation of,[ 91]
 sterile anthers in,[237]
Symmetry compared with heredity,[ 41]
Symmetry of body approximate,[ 78]
Syndactyly,[ 47]
 in foot,[ 48]
Synthetic formulae, in nomenclature,[ 94]

Taeniocampa, fixed and variable species,

[ 25]
Tamias, local forms of,[132]
Tanagers, geographical races of,[159]
Teeth, variation in,[ 39], [ 67]
Tephrosia consortaria and consonaria,[137], [139], [140]
Tephrosia species, separated by season,[119]
Terminal members, variation of,[ 68]
Thais rumina, local variation in,[ 27]
Tolerance, persistence of diversity due to,[ 17], [134]
Tomato, number of cells in fruit,[ 46]
Transitional populations, rarity of,[165]
 an example,[178]
Tropaeolum, sterile anthers in,[237]
Trypanosomes, variation in,[215]
Tusk, of Elephant, segmented,[ 38]
 of Narwhal,[ 44]
Twinning,[ 41], [ 44], [ 71]
 heredity of,[ 45]
 in organs,[ 46]

Uria troile, variety of,

[150]

Vanessa urticae, effects of temperature,

[191]
Variation, a medley of phenomena,[14-15]
 sporadic,[131], [134]
 and locality,[118]
 Causes of genetic,[ 86], [ 87], [131], [212]
 Substantive and meristic,[ 83]
Veronica, specific difference in,[ 16]
 intermediates between species,[ 17]
Vertebrae, division in,[60-61]
 homologies of,[ 66]
Vespa, specific difference in,[ 23]
Vortex, living organism compared with,[ 40]

Wave-motion compared with repetition of parts,

[ 62], [ 67], [ 79]
Wheat, cumulative factors in,[116]
 climatic experiments on,[195]
Woodpecker,[234]

Zebra, pattern of stripes compared with ripples,

[ 38]