670 



INDEX 



TRANSLOCATION— (con/^.) • 



heterozygote, 265 



lateral, 74 



reciprocal, see interchange. 

 Trialeurodes, jyy, 450 

 Trichoniscus, 216, 469 

 Trichoptera, 9^, 358, 368 

 Tricyrtis, III 

 Trillium, no, 2^4, 487 

 Trimerotvopis, 153, 261, 264 

 TRIPLOID, and apomixis, 470 



constitution, 61 



crossing-over, 284, 551 



Hahrobracon, 379 



hybrid, 187 et sqq. 



interchange, 157 



inversions, 271, 279 



origin of, 67 



pachytene, 493 



progeny, 317 et sqq., 326, 32 j 

 Tripsacum, igi, 208, 446 



See also Zea. 

 Trirhabda, 358 

 TRISOMIC, 319 



constitution, 61 



mutation, 69 



(Enothera, 338, 353, 448 



origin, 68 



Rumex acetosa, 364 



secondary, 148 



secondary change, 279 



sex chromosomes, 385, 386 



tertiary, 156 



true breeding, 353 et sqq. 



Zea Mays, 282 

 Triticum, haploid, 201, 417, 444 



interchange, 157, 160, 161 



spindle, 530 



failure, 408 et sqq. 



triploid progeny, 317 et sqq. 

 Triticum hybrids, 772, j/j, 204 



meiosis in, 414 



non-reduction, 4iy 



pairing, 2og et sqq. 

 Triticum durum, 170 



monococcum, 311, 417 



turgidum, 170 



vulgar e, 200, 278 

 unbalance, 323 

 Triticum-^ gilops hybrids, 161, i6g, 



174 

 haploid, 201, 418, 445 

 tetraploid, 185 et sqq., igo 

 Triton, 523, 533 



chromosome size, 55 



TRIVALENT, 120, 124, 128 



Hyacinthus, 130 

 inversions, 272 

 orientation, 131, 529 



. Tulip a, 122 



Tryxalis, 311 



Tulipa, V, XII 



chromosome number, 84 

 doubling in embryo-sac, 67 

 first metaphase, 122 

 inversions, 265, IX 

 pollen grains, 396 

 spirals, 4gi , XIII 

 terminalisation, 513 

 triploid meiosis, 119 

 triploids, 216, 2iy 

 univalents, 411 



Tulipa Clusiana, 215, 226 



Tulipa galatica, 63 



fragments, 72, 145, 531 



Turbellaria, 7 



twin seedlings, 447 



Ulothrix, 458 



ultra-violet irradiation, 422 



ultra-violet photographv, 180, 334, 



423, 563, XV 

 unbalance, see balance. 

 UNIVALENT, 123, 132, 164 et sqq., 

 410 et sqq. 



and cell-wall, 545 



division cycle, 538 



Hyacinthus, 127 



metaphase plate, 530 



Rosa canina, 462 



secondary pairing, 242 

 Urechis, 535 

 Uredineae, 458 

 Urginea, 129 

 Uvularia, 69, 114, 221 



sub-haploid, 317 



Vahlkampfia, 50, 531 

 Valeriana, 228 

 Vallisneria, 224, 234 

 Vanduzea, 373 

 Vaucheria, 458, 466 

 vegetative reproduction, 4 

 Veronica, 21 j 



viability, differential, 316 et sqq. 

 Vicia hybrids, 55, 140, 148, 155 



trisomic, 3ig 

 Vicia Cracca, 59, 228 



