INDEX 



663 



Nicandra, 509 

 Nicotiana, balance, 327 



basic number, 241 



haploid, 4iy, 444 et sqq. 



non-reduction, 298 



origin of polyploids, igo, igi 



triploids, 210 

 Nicotiana, alata, 77, 402 



digluta, I go, 225 



glutinosa-Tabaciim, iSy 



Lansdorffii, 77 



longiflora, 239 



rustica-paniculata, 187 



suaveolens, 125 

 Nicotiana Tabacum, autosyndesis, 

 214 



non-pairing, 403 



pentasomic, 321 



secondary polyploid, 241 

 structural change, 278 

 Nigritella, 469 

 Nishiyama, 324 

 NON-DISJUNCTION. 152 et sqq., 



353 



chromatid, 263, 350 

 NON-HOMOLOGOUS PAIRING. 



see pairing, 

 non-reduction, see ameiosis. 

 Nothoscordon, 79. 21^, 440. 

 nucellar embryony. 440 et sqq. 

 nuclear cycle, 481, 561 

 nuclear division, multiple, 49 



See also mitosis, amitosis. meiosis. 

 ameiosis. 

 nuclear membrane, see nucleo- 



cvtoplasmic surface. 

 NUCLEAR SAP, 24, 46, 521 

 nucleo-cytoplasmic surface, 19, 25, 



503, 544 

 nucleolar constriction, see 



constriction. 

 NUCLEOLUS. 20. 23, 98, 102 



movement of, 46, 92 



organisation of, 228, 304 



origin of, 39 



salivary glands, 176 



and sex chromosomes, 306, 312, 501 

 NUCLEUS, 2. 9, 18 et sqq. 



division of, see mitosis, meiosis. 



multiple division, 49 



size of, 20, 103 



solid and vesicular, 46 

 Nyctereutes, 313 



Ochna, 218 et sqq., 438 et sqq. 



OCTOPLOID, 215 

 Odonata, 367 

 CEcanthus, 36J 

 CEdogonium, 5 

 (Enothera, 335 et sqq., VI 



crossing-over, 288 



half-mutants, 277, 345 



haploid, 262, 328, 4iy, 444, 559 



monosomic, 316 



multiple chiasmata, 122 



mutations, 279 



non-pairing, 151 



nucleoli, 103 



progeny of triploids, 320 



segregation, 248 



terminalisation, 112, 511 



tetraploid, ig4 



triploid, 157 



trisomic, 353 et sqq. 



X-ray, 160 

 (Enothera Lamarckiana, ig4 



trisomic, jjp 

 Oligochaeta, 534 

 OLIGOPYRENE, 10 

 Oncopeltus, 358 

 OOCYTE, crossing-over, 272 



meiosis, XIV 

 oogenesis, nucleoli, 306, 312 

 Ophryotrocha, 390, 534 

 organiser, see nucleolus. 

 Orgyia, 78, 162 

 ORIENTATION, auto-, 539 



centromere, 35, 523 



CO-, 131, 539 



failure of, 526 



and hydration, 544 



multivalents, 120, 529 



univalents, 411 et sqq. 

 Ornithogalum, 37, 81 

 Orthoptera, 36y, 373 

 Oryza, 125, 242, 248, 429 



haploid, 444 



triploid, 216 

 Osmunda, 448 



PACHYTENE, 87 et sqq., 166 

 in allopolyploids, 206 

 coiling, 489 



and crossing-over, 548 et sqq. 

 forces, 492 

 interlocking, 257 

 (Enothera, 346 

 sex chromosomes, 368, 369 

 structural hybrid. 262, 266, 270 

 in tetraploids, 120 



