Notes

Abraxas grossulariata,99"Acquired" characters,14Adaptation,143Agouti mice,50Albino mice,50Albinos, nature of,53Amauris,144Analysis of types,156Ancestral Heredity, Law of,13Andalusian fowls,70Axil colour in sweet peas,93Bateson, W.,14,29,55,116,132,141Biffen, R. H.,157Blue Andalusian fowls,71Brachydactyly,171Bryony,120Bush sweet peas,63Castle,132Cattle, horns in,86,166Colour, nature of, in flowers,48Colour-blindness,117Combs of fowls,33,43Correns, C.,29,120Coupling of characters in gametes,93Cuénot,50,119"Cupid" sweet peas,62Currant moth,99Darwin, C.,10,65,147,163De Vries, H.,15,29,141Discontinuity in variation,14Dominant characters,18Doncaster, L.,99Drinkwater, H.,172Dutch rabbits,60Eggs,2Environment, influence of,137Euralia,144Evolution,10,85,139Eye, in primulas,55Eye-colour, in man,176Factor, definition of,31Factors, interaction of,42Fertilisation,3Fertilisation, self- and cross-,163Fixation of varieties,153Fluctuations,138Fowls, coloured from whites,49,73Galton,13,179Gametes, nature of,6Gregory, R. P.,55,93Hæmophilia,176Hardy, G. H.,147Heterozygote, definition of,28Heterozygote, of intermediate form,68Hieracium,27,132Himalayan rabbits,60Homostyle primulas,56Homozygote, definition of,28Hooded sweet peas,89Horses, bay and chestnut in,167Hurst, C. C.,62,176,180Immunity in wheat,158Individuality,135Inhibition, factors for,74,108Intermediates,125Johannsen, W.,160Lop-eared rabbits,132Mendel,8,17,26,132Mental characters,180Mice, inheritance of coat colour in,50Mimicry,143Mirabilis,151Morgan, T. H.,116Mulattos,129Mutation,83,138Nägeli, C.,26Natural selection,11,140,142,149Nettleship, E.,175Night-blindness,175Pararge egeria,132Parkinson, J.,122Pea comb,33Peas, coloured flowers in,24Peas, tall and dwarf,18Pigeons,86Pin-eye in primulas,55Pisum,17Primulas,31,55,68,93Pollen,3Pollen of sweet peas,92Pomace fly,115Population, inheritance of characters in a,147Presence and Absence theory,35Pure lines,162Purity of gametes,24Purity of type,155Rabbits,53,60Ratios, Mendelian—3 : 1,209 : 3 : 3 : 1,25,349 : 3 : 4,519 : 7,49Ray, John,143Recessive characters,19Repulsion between factors,90Reversion,59,165in rabbits,59in sweet peas,62in fowls,65in pigeons,65Rose comb,33Saunders, E. R.,54,122Seeds, nature of,4Segregation,22Selection,162Sheep, horns in,76Silky fowls,30,105Single comb,32Species, nature of,150Species, origin of,11Speckled wood butterfly,132Spermatozoa,3Sports,147Staples-Browne, R.,66Sterility,151Sterility in sweet peas,93Stocks, double,122Stocks, hoariness in,54Sweet pea, colour in,44,79history of,82inheritance of hood in,89inheritance of size in,62Telegony,167Thrum-eye in primulas,55Toe, extra toe in poultry,76Tschermak, E.,29Unit-character, definition of,31Variation,14,137,139Walnut comb,33Weismann, A.,13Wheat, beard in,74experiments with,157White, dominant in poultry,72Wilson, J.,168Yellow mice,119Zygotes, nature of,5

Abraxas grossulariata,99

"Acquired" characters,14

Adaptation,143

Agouti mice,50

Albino mice,50

Albinos, nature of,53

Amauris,144

Analysis of types,156

Ancestral Heredity, Law of,13

Andalusian fowls,70

Axil colour in sweet peas,93

Bateson, W.,14,29,55,116,132,141Biffen, R. H.,157Blue Andalusian fowls,71Brachydactyly,171Bryony,120Bush sweet peas,63

Bateson, W.,14,29,55,116,132,141

Biffen, R. H.,157

Blue Andalusian fowls,71

Brachydactyly,171

Bryony,120

Bush sweet peas,63

Castle,132Cattle, horns in,86,166Colour, nature of, in flowers,48Colour-blindness,117Combs of fowls,33,43Correns, C.,29,120Coupling of characters in gametes,93Cuénot,50,119"Cupid" sweet peas,62Currant moth,99

Castle,132

Cattle, horns in,86,166

Colour, nature of, in flowers,48

Colour-blindness,117

Combs of fowls,33,43

Correns, C.,29,120

Coupling of characters in gametes,93

Cuénot,50,119

"Cupid" sweet peas,62

Currant moth,99

Darwin, C.,10,65,147,163De Vries, H.,15,29,141Discontinuity in variation,14Dominant characters,18Doncaster, L.,99Drinkwater, H.,172Dutch rabbits,60

Darwin, C.,10,65,147,163

De Vries, H.,15,29,141

Discontinuity in variation,14

Dominant characters,18

Doncaster, L.,99

Drinkwater, H.,172

Dutch rabbits,60

Eggs,2Environment, influence of,137Euralia,144Evolution,10,85,139Eye, in primulas,55Eye-colour, in man,176

Eggs,2

Environment, influence of,137

Euralia,144

Evolution,10,85,139

Eye, in primulas,55

Eye-colour, in man,176

Factor, definition of,31Factors, interaction of,42Fertilisation,3Fertilisation, self- and cross-,163Fixation of varieties,153Fluctuations,138Fowls, coloured from whites,49,73

Factor, definition of,31

Factors, interaction of,42

Fertilisation,3

Fertilisation, self- and cross-,163

Fixation of varieties,153

Fluctuations,138

Fowls, coloured from whites,49,73

Galton,13,179Gametes, nature of,6Gregory, R. P.,55,93

Galton,13,179

Gametes, nature of,6

Gregory, R. P.,55,93

Hæmophilia,176Hardy, G. H.,147Heterozygote, definition of,28Heterozygote, of intermediate form,68Hieracium,27,132Himalayan rabbits,60Homostyle primulas,56Homozygote, definition of,28Hooded sweet peas,89Horses, bay and chestnut in,167Hurst, C. C.,62,176,180

Hæmophilia,176

Hardy, G. H.,147

Heterozygote, definition of,28

Heterozygote, of intermediate form,68

Hieracium,27,132

Himalayan rabbits,60

Homostyle primulas,56

Homozygote, definition of,28

Hooded sweet peas,89

Horses, bay and chestnut in,167

Hurst, C. C.,62,176,180

Immunity in wheat,158Individuality,135Inhibition, factors for,74,108Intermediates,125

Immunity in wheat,158

Individuality,135

Inhibition, factors for,74,108

Intermediates,125

Johannsen, W.,160

Lop-eared rabbits,132

Mendel,8,17,26,132Mental characters,180Mice, inheritance of coat colour in,50Mimicry,143Mirabilis,151Morgan, T. H.,116Mulattos,129Mutation,83,138

Mendel,8,17,26,132

Mental characters,180

Mice, inheritance of coat colour in,50

Mimicry,143

Mirabilis,151

Morgan, T. H.,116

Mulattos,129

Mutation,83,138

Nägeli, C.,26Natural selection,11,140,142,149Nettleship, E.,175Night-blindness,175

Nägeli, C.,26

Natural selection,11,140,142,149

Nettleship, E.,175

Night-blindness,175

Pararge egeria,132Parkinson, J.,122Pea comb,33Peas, coloured flowers in,24Peas, tall and dwarf,18Pigeons,86Pin-eye in primulas,55Pisum,17Primulas,31,55,68,93Pollen,3Pollen of sweet peas,92Pomace fly,115Population, inheritance of characters in a,147Presence and Absence theory,35Pure lines,162Purity of gametes,24Purity of type,155

Pararge egeria,132

Parkinson, J.,122

Pea comb,33

Peas, coloured flowers in,24

Peas, tall and dwarf,18

Pigeons,86

Pin-eye in primulas,55

Pisum,17

Primulas,31,55,68,93

Pollen,3

Pollen of sweet peas,92

Pomace fly,115

Population, inheritance of characters in a,147

Presence and Absence theory,35

Pure lines,162

Purity of gametes,24

Purity of type,155

Rabbits,53,60Ratios, Mendelian—3 : 1,209 : 3 : 3 : 1,25,349 : 3 : 4,519 : 7,49Ray, John,143Recessive characters,19Repulsion between factors,90Reversion,59,165in rabbits,59in sweet peas,62in fowls,65in pigeons,65Rose comb,33

Rabbits,53,60

Ratios, Mendelian—

3 : 1,20

9 : 3 : 3 : 1,25,34

9 : 3 : 4,51

9 : 7,49

Ray, John,143

Recessive characters,19

Repulsion between factors,90

Reversion,59,165

in rabbits,59

in sweet peas,62

in fowls,65

in pigeons,65

Rose comb,33

Saunders, E. R.,54,122Seeds, nature of,4Segregation,22Selection,162Sheep, horns in,76Silky fowls,30,105Single comb,32Species, nature of,150Species, origin of,11Speckled wood butterfly,132Spermatozoa,3Sports,147Staples-Browne, R.,66Sterility,151Sterility in sweet peas,93Stocks, double,122Stocks, hoariness in,54Sweet pea, colour in,44,79history of,82inheritance of hood in,89inheritance of size in,62

Saunders, E. R.,54,122

Seeds, nature of,4

Segregation,22

Selection,162

Sheep, horns in,76

Silky fowls,30,105

Single comb,32

Species, nature of,150

Species, origin of,11

Speckled wood butterfly,132

Spermatozoa,3

Sports,147

Staples-Browne, R.,66

Sterility,151

Sterility in sweet peas,93

Stocks, double,122

Stocks, hoariness in,54

Sweet pea, colour in,44,79

history of,82

inheritance of hood in,89

inheritance of size in,62

Telegony,167Thrum-eye in primulas,55Toe, extra toe in poultry,76Tschermak, E.,29

Telegony,167

Thrum-eye in primulas,55

Toe, extra toe in poultry,76

Tschermak, E.,29

Unit-character, definition of,31

Variation,14,137,139

Walnut comb,33Weismann, A.,13Wheat, beard in,74experiments with,157White, dominant in poultry,72Wilson, J.,168

Walnut comb,33

Weismann, A.,13

Wheat, beard in,74

experiments with,157

White, dominant in poultry,72

Wilson, J.,168

Yellow mice,119

Zygotes, nature of,5

[1]Cf. note on p.171.[2]It has been found convenient to denote the various generations resulting from a cross by the signs F1, F2, F3, etc. F1on this system denotes the first filial generation, F2the second filial generation produced by two parents belonging to the F1generation, and so on.[3]Hurst's original cross was between a Belgian hare and an albina Angora, whichturned out to bea masked Dutch.[4]The Spot is an almost white bird, the colour being confined to the tail and the characteristic spot on the head.[5]The reader who searches florists' catalogues for these varieties will probably experience disappointment. The sweet pea has been much "improved" in the past few years, and it is unlikely that the modern seedsman would list such unfashionable forms.[6]It is to be understood that wherever a given factor is present the plant may be homozygous or heterozygous for it without alteration in its colour.[7]It should be mentioned that as the shape of the pollen coat, like that of the seed coat, is a maternal character, all the grains of any given plant are either long or else round. The two kinds do not occur together on the same plant.[8]For the most recent discussion of this peculiar case the reader is referred to Professor Castle's paper inScience, December 16, 1910.[9]Paradisus Terrestris, London, 1629, p. 261.

[1]Cf. note on p.171.

[2]It has been found convenient to denote the various generations resulting from a cross by the signs F1, F2, F3, etc. F1on this system denotes the first filial generation, F2the second filial generation produced by two parents belonging to the F1generation, and so on.

[3]Hurst's original cross was between a Belgian hare and an albina Angora, whichturned out to bea masked Dutch.

[4]The Spot is an almost white bird, the colour being confined to the tail and the characteristic spot on the head.

[5]The reader who searches florists' catalogues for these varieties will probably experience disappointment. The sweet pea has been much "improved" in the past few years, and it is unlikely that the modern seedsman would list such unfashionable forms.

[6]It is to be understood that wherever a given factor is present the plant may be homozygous or heterozygous for it without alteration in its colour.

[7]It should be mentioned that as the shape of the pollen coat, like that of the seed coat, is a maternal character, all the grains of any given plant are either long or else round. The two kinds do not occur together on the same plant.

[8]For the most recent discussion of this peculiar case the reader is referred to Professor Castle's paper inScience, December 16, 1910.

[9]Paradisus Terrestris, London, 1629, p. 261.

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