INDEX 



673 



System, of labelling and recording data, 423 



of pedigree, 203 



of reaction, in species, 242, 286 



Svalof , 425 

 Systems of breeding, 580 



Tanaka, linkage relations, 200, 210 



multiple allelomorphs in silkworms, 158 

 Telegony, 564, 570 

 Teosinte, crossed with maize, 296 

 Terminology, Mendelian, 71 

 Tetrahybrid ratio, 94 

 Tetraploidy, 263 



causing gigantism, 264 

 Timer, plant breeding, 437 



selection, 288 

 Theory of error, 44 



of evolution, de Vries', 282 



of multiple factors in size inheritance, 185 



of reduplication in linkage, 126 

 Thomson, acquired characters, 481, 491, 494 



heredity concept, 3 

 Tick, Texas fever, 528 

 Tilia vulgaris, 365 



Timber trees, rapid growing hybrid, 365 

 Timothy, breeding, 294 



remnant system, 335 

 Tinged eye color in Drosophila, 156 

 Tissues, in graft-hybrids, 377, 380 

 Tobacco, 317 



corolla length in, 181 



crossed by humming birds, 319 



decreased vigor in some species hybrids, 230 



disease resistant strains, 418 



fasciated, 130 



graftage of, 374 



increased yield in Fi, 363 



mutation affecting stature, 177 



mutations in, 367 



Stewart Cuban, 368 

 Tomato, 317 



chimeras, 381 



color chimera, 272 



higher yield in Fi, 362 



mutations in, 369 



nightshade graft-hybrids, 374 



practicability of using Fi seed, 363 



red cherry, 28, 29 



strain tests, 432 



tall and dwarf, 174 



wilt resistant, 415 

 Tower, beetles, 261, 259, 370 



germinal variations, 30, 31 



Leptinotarsa, 248, 259 



pure strain, 259 



selection effect, 258, 260 

 Tragopogon pratensis X T. porrifolius, 438 

 Training, question of inheritance of, 480, 483 

 Trapnesting hens, 592, 593 

 Trees, "pedigreed" vs. recorded, 394 



rapid growing hybrid, 365 



top working poor, 391 

 43 



Trial gardens, 299 

 Trihybrid, 90 



ratio, typical, 93 

 Triploidy, 263 

 Triticum, vulgare var. fuliguosum, 412 



vulgare, sub-species, 339 

 Tropeeolum majus X T. minus, 230 

 Trotting, horses, registration of, 406 



record, reduction of, 484, 495 

 Trow, linkage theory, 126 

 Truncate-winged Drosophila, Altenburg and 



Muller's, 168 



von Tschermak, rediscovery of Mendel's prin- 

 ciples, 68 



Tuber-unit method in potato, 395 

 Tufts, somatic segregation, 274 

 Tulip, hybridization by Dutch, 287 



species and varieties, 302 

 Type, building the ideal, 611 



maintaining by vegetative propagation, 386 

 Types, determining ideal, 612 



difficulties in establishing, 428 



of factor interactions, 163 



originate by mutation, 386 

 Tyson, York Imperial apples, 394 

 Tyzzer, mice, 529 



tumors, 527 



U 



Uniformity in F\ of species hybrids, 227 



Unit characters, 71, 72 



Upton, horses, 444 



Urban, alfalfa, 296 



Use and disuse, inheritance of effects of, 492 



Utilization of clonal diversity, 302 

 of hybrids in breeding, 353 

 of locally adapted plants, 441 

 of mutations, 302, 464 



Valk, grape hybridizer, 290 

 Vanessaio, 23 

 Van Fleet, chestnuts, 410 



Variability, increased on crossing selected races, 

 188 



in Ft in quantitative inheritance, 186 

 Variable character expression in hybrids, 149 

 Variation, 1, 2, 439 



and development, 20 



and environment, 21 



bud, 385 



by recombination, 459 



caused by modifiability, 454 

 by selection, 454 



complexity of, 428 



concept, 15 



denned, 3 



fluctuating, 16, 18, 32 



importance of understanding, 325 



in domestic animals, 453 



universality of, 14 



