674 
Variations, classification of, 15 
autogenetic, 20 
combinations, 15 
continuous, 18 
differences between them, 18 
direction, 20 
discontinuous, 18, 274 
ecological, 18 
ectogenetic, 20 
fluctuating, 18, 32 
fortuitous, 20 
heritability, 15 
homeotic, 16 
meristic, 16 
minus and plus in hooded.rats, 188 
modifications, 15 
morphological, 16, 17 
mutations, 15 
nature, 16, 317 
orthogenetic, 20 
physiological, 16, 18 
psychological, 17 
Variegated, Abutilons, 382 
geranium, 381 
maize, 272, 381 
Mirabilis, 273, 381 
plants not mosaics, 273 
sporting of, 272, 381 
snapdragon, 381 
Variegation, association with mutation, 272 
factor mutations, 381 
in Malvacee, 381 
pathological, 381 
Varieties, disease resistance in, 416 
factors in, 219| 
importance of keeping pure, 341 
in plants, 302 
methods of creating, 302 
origin of, in Boston fern, 312 
of sweet pea, 303 
running our, 340, 395 
standardization of, 432 
value of proved sorts, 341 
Variety testing, experimental errors, 429 
standards for, 435 
stations, 416 
tests, 427 | 
Vavilov, rust resistant wheat, 412 
Vegetative, in Boston fern, 312, 316 
mutation vs. somatic segregation, 272 
mutations, 270 
Verbascum, 438 
blattaria x V. lychnitis, 230 
lychnitis & V. thapsus, 230 
Vestigial wings, inheritance of, in Drosophila, 87 
Viala and Ravaz, grape phylloxera, 403 
Vigor in F; hybrids, 230, 326 
de Vilmorin, André, carrots, 290 
mass selection, 292 
de Vilmorin, Louis, pedigree culture, 419 
linkage in peas, 125 
plant breeding, 299, 437 
progeny test, 293 
seed establishment, 290 
INDEX 
de Vilmorin, selection, 366 
sugar beet, 291 
wheat, 257, 258, 291, 419 
Vilmorin method of plant breeding, the, 291, 293 
Vine, see Grape. 
Violet, bud selection, 391 
bud sports in, 398 
dimorphic flowers, 275 
species and varieties, 302 
Vitis, cinerea, estivalis, linsecomii, candicans, 
rotundifolia, californica, rupestris, 
riparia, cordifolia, and verlanderi, 404 
vinifera, 403 
de Vries, Alhambra plum, 298 
“Die Mutationstheorie,”’ 282 
discovery, 439 
evolution theory, 276 
mutants, 279 
classified, 282 
mutation theory, 3, 7, 371 
mutations, 283, 286 
discovery of, 276 
Cnothera crosses, 229, 244 
Cnothera lamarckiana, 277 
. levifolia, 278 
on Le Couteur, 289 
on Shirreff, 289 
pangens, 246, 247 
progressive species, 281 
rediscovery of Mendei’s principles, 68 
somatic variations, 272 
species hybridization, 244 
w 
Wagner, immunity to rust, 413 
vonWahl, mare mule and foal, 518 
Walnut, heterosis in, 364 
oak-like, 265 
Paradox, 364 
Royal, 297, 364 
Warner, egg production, 507 
Wasps destroy paper bags, 344 
Watermelon, 317 
wilt resistant hybrid, 414 
Waugh, on grape hybridizers, 290 
Webber, citrus, 297 
clonal or bud selection, 391 
corn, 293 
cotton, 292 
tuber-unit, 395 
Weismann, acquired characters, 480, 484 
amphimixis, 3, 484 
body and strip, 489 
Wellington, tomato, 362, 363 
Wentworth, color in horses, 466, 467, 468 
Westgate, alfalfa, 296 
Wheat, 317 
autogomaous, 257 
breeding begun, 289 
centgener method, 293 
crossed with rye, 229, 236 
Defiance, 336 
duplicate factors discovered in, 137 
Digitized by Microsoft® 
