INDEX 



Nicotiana, partial sterility in species hybrids, 

 238 



rustics X N. paniculata, 438 



species hybrids, 227, 228, 229, 232 



sylvestris, illustrated, 239 



tabacum, mutations in, 367 



tabacum X sylvestris, 218, 238, 244, 575 



vigor in species hybrids, 230 

 Nicotine, transmission from stock to scion, 384 

 Nightshade, graftage of, 374 



species hybrids, 439 



-tomato graft-hybrids, 374 

 Nilsson, pedigree culture, 419 



selection, 366 



Svalof system, 425 



Vilmorin method, 293 

 Nilsson-Ehle, creating populations, 350 



duplicate factors, 137 



oats, 368 



Nomenclature, confusion in, 428 

 Non-disjunction in Drosophila, 198, 204 



primary, 199 



secondary, 200 



Non-functional gametes and zygotes, 248 

 Non-Mendelian inheritance, 248 



no clear evidence for, 248 

 Normal curve and its significance, 34 

 Norton, Jesse B., Puccinia asparagi, 415 

 Norton, J. B. S., color chimera, 272 



tomato wilt, 415 

 Nucleus, 59, 61, 62 

 Nucleolus, 60, 61 

 Nursery stock, pedigreed, 394 



recorded, 394 

 Nuts, breeding disease-resistant, 410 



heterosis in, 364 



Oak, Fi hybrids in, 365 

 Oats, 317 



autogamous, 257 



Banner, 340 



Imported Scotch, 340 



Irish Victor, 340 



linkage in, 125 



little natural crossing, 318 



mutations in, 367, 371 



pure lines, 293, 340, 371 



selection of pure lines, 371 

 Obrecht, mule, 516 



Observation, method of, in genetic research, 4 

 (Enothera, albida, 281, 282, 285 



biennis X O. franciscana = nec-lamarckiana, 

 248, 283 



brevistylis, 279, 282, 284 



crossbreeding experiments, 283 



cytological studies in, 285 



factor mutations in, 285 



genetic factors, 283, 284 



gigas, 280, 282, 285 



investigations classified, 283 



lasvifolia, 278, 282, 285 



(Knothera, lamarckiana, chromosome number 

 285 



described, 276 

 family pedigree, 279 

 hybrid, origin of, 282 



lamarckiana X O. rubrinervis, 245 



lata, 279, 282, 285 



matroclinous species hybrids, 229 



Mendelian inheritance in, 283, 285 



"mutations," 276 



nanella, 279, 282, 285 



nanella X O. rubrinervis, 245 



oblonga, 281, 282, 285 



pangens, 247 



progressive, degressive, regressive and in- 

 constant species, 281 



rubricalyx, 284 



dominant mutant, 267, 270 



rubrinervis, 280, 282, 285 



rubrinervis X O. nanella, 247 



scintillans, 281, 282, 285 



seed sterility, 283 



species hybridization, 244 

 Okra, dimorphic leaves, 275 

 Olive chimeras, 381 

 Oliver, hybridizing alfalfa, 348, 349 

 Olmstead, experimental error, 430 

 Orange, Australian navel, 271 



bud selection, 391 



chimeras, 375 



corrugated, 392 



performance records, 391 



ribbed, 392 



Thomson navel, 392 



Washington navel, 391, 392 



yellow navel, 392 



Organic evolution and chromosome development, 

 264 



role of factor mutations, 286 

 Organization of plant breeding, 299 

 Organizations of plant breeders, 300 

 Origin of Boston fern varieties, 312 



of domestic animals, 460 

 varieties of plants, 302 



of sweet pea varieties, 303 



of varieties of sorghum, 370 

 Ornamental trees, rapid growing, 365 

 Orthogenetic variations, 20 

 Orton, cotton, 417 



Fusarium niveum, 415 



potato, 416 



watermelon, 414 

 Outbreeding, 583 



Paelinck, stock and scion, 383 



Pangens, 246 



Parallel induction, 492 



de Parana, zebra hybrids, 570 



Paratettix, mosaic expression in, 152 



multiple allelomorphs in, 157, 160 

 Parents, choice of in hybridization, 343 



culture of in hybridization, 343 



