INDEX 



657 



Factor, interpretation of quantitative inheritance, 



195 

 mutations, 263, 264 



at maturation, 260, 270 



cause variegation, 381 



classes, 265 



conception of, 267 



germinal and somatic, 268 



in Boston fern, 315 



in Coleus, 388 



in domestic animals, 462 



in Drosophila, 110, 154, 177, 190, 192, 267, 

 462, 554 



in meristematio tissue, 269 



in (Enothera, 285 



nature and causes, 266, 273 



not of fortuitious occurrence, 268 



occurrence of, 371 



produce cultivated varieties 366 



rdle in evolution, 286 

 potency and prepotency, 575 

 relations in quantitative inheritance, 174 

 system in stocks, 166 

 systems affecting a single character, 195 

 variability, by hypothesis of, 192 

 Factors, 7, 59, 67, 71 



affecting experimental results, 433 



alterations in, 263, 267 



chemical composition, 267 



coat color in horses, 466 



competitive action of, 150 



complementary, 140 



contamination of, 189 



cumulative, 140 



defined, 129 



duplicate, 136 



first, second, third and fourth groups in 



Drosophila, 117 



for corolla length in tobacco, 183 

 for fecundity in fowls, 561 

 for high and low protein and oil, 333 

 for stature in sweet peas, 175 

 four groups in Drosophila, 1 10 

 history in a cross, 70, 73 



in a dihybrid cross, 81 

 homologous in species, 224 

 in Antirrhinum, 223 

 in Cavius, 223 

 influencing fertility, 551, 554 

 lethal, 131, 546 

 linear arrangement of, 115 

 linked in same chromosome, 108 

 manifold effects of, 133 

 modifying, 190, 192, 454 

 nature and expression of, 129 

 plotted relations in Drosophila, 116 

 potency of sex, 217 

 producing like somatic effects, 140 

 recombination of, in Ft, 186 

 relatively stable entities, 194, 267 

 sex, 215, 548 



sex-linked in X-chromosome, 196, 546, 548 

 system of, in maize, 163 

 Fairchild, seed and olant introduction, 299 

 42 



Farmer and Digby, chromosomal dimensions, 264 



Primula kewensia, 264 

 Farrell, experimental error, 430 

 Farrer, grains, 296 



rust resistance, 411 



Fecundity in fowls, 497, 550, 560, 574, 585 

 Fern, origin of varieties in Boston, 312 

 Fertility and the chromosomes, 555 



and heterozygosis, 559 



capable of improvement, 552 



Darwinian theory of, 552 



factors affecting, 554 



in animals, 551, 563 



in female hybrids, 235, 236 



in species hybrids, 235 

 Fertilization, double in maize, 150, 151 



failure of, 350 



Fiber plants, species and varieties, 302 

 Fire-blight, disease, 407 

 Fischer, modified germ cells, 492 

 Flammarion, Coleus, 389 

 Flax, 317 



wilt-resistant, 417 

 Flower, color in sweet peas, 304 



form and sice in sweet peas, 304 

 Flowers, composite crossing, 296 



diversity of varieties, 302 



hermaphrodite, self-fertile, 317 

 cross-fertile, 317 



hybridized in China, 287 



species hybrids, 297 

 Fluctuating modifications, 383 



variations, 18, 32, 428, 439 

 Focke, hybrid, 438 



sexuality, 437 



species hybrids, 227, 228, 231 

 Fdex, phylloxera resistance, 405 

 Forms of species hybrids, 227 

 Forficula auricularia, 48 

 Fortuitous variations, 20 



Four o'clock, see Mirabilis jalapa. . 



Fowls, Andalusian, 152, 476, 514, 579 



Bantam, 499 



Barred Plymouth Rock, 504, 574, 575 



Breda, 476 



breeding, for fecundity, 585 



Brown Leghorn, 548 



comb character in, 164 



Cornish Indian Game, 560, 575 



creation of bantam varieties, 500 



dominant white, 579 



effects of alcohol on, 493 

 of castration in, 550 



egg production in, 456, 497, 559, 560, 607 



fecundity factors in, 561 



fecundity in, 497, 559 



hybrid, 521 



Mendelian characters in, 477 



Mendelism in, 476 



ovarian transplantation, 487 



phyletio origin, 460 



pigmentation and egg production, 5O6 



progeny tests, 498 



reversion in, 171 



