Index of Subjects 



409 



Segregation — continued 



absence of 246, 256, 373 



consequences of 15, 356 



nature of 268 



time of 269, 313 



somatic 273, 312 



and species 283 

 Selection 240 



natural 288 

 Selective mating between gametes 119, 



i6r, 195 

 Serrated leaf, Urtica, Phyteuma 22 

 SEX 



and chromosomes 188 



and horns in sheep 169 



and double flowers 197 



and Spurious Allelomorphism 174, 195, 



319 

 and wings 170 

 determination of 164, 321 

 of Bryonia 166 

 Lychnis 169 

 of rabbits 192 

 summary of evidence 190 

 Sex-limited descent 169, 221, 222, 310, 



319 



in deaf- mutism 229 



in tylosis 219 



dominants 231 

 Sheep 



colour 42 



horns 169 

 Shirley poppy 241 

 Silene injlata 19 

 Silk, colours 137, 310 

 Silkworm colours 43, 137, 310 

 Silky fowl 



comb 34 



feathers 35 



inheritance of pigmentation 185 



white colour of 103 

 Single flowers 31 

 Smooth foliage 22 

 Snapdragon, see Antirrhinum 

 Sociological application 303 

 Somatic segregation 273, 3H 

 Species 



basal organisation perhaps not trans- 

 ferable 73 



hybrids of 283, 371 



problem of 4, 283 



segregation between 284 

 Spleen, enlarged 220 

 Sports, bud 272 

 Standard 



erect and hooded 26, 153-157 



shape of, in sweet pea 153 

 Stature 



man 209 



peas 8, 281 

 Stem, colour of, in Primula 138 

 Sterility of anthers in sweet pea 28, 

 152 



Sterility — continued 



affecting descent 169 



of Boarmia hybrids 172 



of double flowers 198, 201 



of hybrids 251, 366 



of yellow mice 163 



self-sterility 242 

 Stigmas, colour of, in Primula 130 

 STOCKS 



branching 19, 20 



" Brompton," peculiarities of 134 



colours 95, 98 



cream 204 



double 201 



glands 21 



"half-hoary" 238 



hoariness 19, 95, 238 



„ relation to colours 133 



ovules and pollen dissimilar in doubles 

 166 



pods, individuality of 254 



ratios 314 



reversion 95, 133 



"sulphur" 204 



white, peculiarity of 106 

 Straw 22 

 Strawberry 248 

 Striping, in Antirrhinum 99 



in Mirabilis 312 

 Structural characters in animals 32 



„ „ in plants 18 



Style 



Primula 27 



Oenothera 28 

 Subtraction-stages of factors 143, 237 

 Swedes, colour 135 

 SWEET PEA 8, 9, 39 



bicolours dominant 87 



bud-sport 274 



*' bush " variety 19 

 crossed with cupid " 281 



colour in axils 152 



colours, relation of 91 . 



"cupid" 19, 281 



gametic coupling in 140 



height 18, 281 



heredity compared with that of Antir- 

 rhinum 98 



pollen grains 28, 89, 91, 150, 156 



reversion in 89, 281 



seed-shape 265 



"snapdragon" 26 



spurious allelomorphism 153, 155 

 Symmetry and heredity 274 



Taillessness, Cat, Dog 34 



Fowl 35 

 Tallness 8, 18 

 Taraxacum 247 

 Technique 301 

 Teleangiectasis 220 

 Terms in Fi, number of 59 

 Todas, colour-blindness in 223 



