594 



Subject Index 



Spindle, 9, 12, 13, 59, 63. 64, 317, 



318, 471, 474, 476 

 Spindle fiber attachment point, 7 

 Spindle fibers, 9 

 Spore. 50, 480, 502, 503. 504 

 Sporophyte, 50, 52, 480, 502. 503, 



504, 513, 514 

 effect of mutation on, 233 

 Sports, 226, 235 

 Spruce budworm, 487, 4SS 

 Squash, 315, 321, 325 

 Staminate flowers, 503 

 Standard deviation, 115, 350, 361, 



362, 364 

 Standard error, 114-117. IIS, 135, 



165, 166, 359, 361, 363. 364, 



529 

 Statistical constants, 358 ff . 

 Sterility, of haploids, 434. 437 

 of hybrids, 456, 459, 467, 524, 531, 



532 

 of tetraploids, 445 

 of triploids, 441, 453 

 Stomata, size of in poh''ploids, 450 

 Streptocarpus, 312, 313 

 Subspecies, 517 

 Suckers, 529, 530 

 Superfemale, 249, 482, 498. 506 

 Supermale, 482 



Sweet pea, see Lathyrus odoratus 

 Swine, 368 

 Synapsis, 53, 202 



Telomere, 391 



Telophase, 7, 8, 12, 13, 14, 15, 53, 

 54, 62, 63, 64, 7B, 220. 221 



Temperature, and induction of poly- 

 ploids, 471 

 and mutation rate, 240, 241, 243, 

 251, 254, 255, 258, ^Z59, 263, 

 264 



Terminalization of chiasmata, 58, 

 59, 417, 423, 445, 446, 447 



Testcross, 85, 86, 132, 133, 139, 150, 

 154, 157, 176 



Tetrad, 57 



Tetrahybrids, 140 



Tetraploid, 353, 433, 442, 445-454, 



470, 471. 475 

 sterility of, 445 



Tetrasomic, 430, 445, 449 

 Three-point cross, 178, 180 

 Thuja orientalis, 44^ 

 Tobacco, see Nicotiana 

 Tomatoes, autotetraploid, 448 



chimeras in, 478 



haploids in, 437, 477 



selection in, 383 

 Trabant, 10 

 Tradescantia, deficiencies in, 393 



effect of X-rays on, 401 



hybridization in, 519, 520, 525, 526, 

 527, 528 



tetraploids in, 4A8, 471 



triploids in, 44^, 471 

 Tradescantia hracteata, 441, 442. 528 

 Tradescantia canaliculata, 400, 453. 



471, 519, 520, 526, 527, 528 

 Tradescantia gigantea, 401 

 Tradescantia hirsutiflora, 471 

 Tradescantia occidentalis, 453, 454. 



528 

 Tradescantia paludosa, 60, 61, 400, 



471 

 Tradescantia subaspera var, typica, 



519, 520 

 Tradescantia virginiana, 447, 448, 



526, 527 

 Translocations, 189, 190, 191, 193, 

 194, 195, 196, 264, 267, 353, 

 354, 402, 403, 414 

 Transplantation, 309 

 Trichoniscus elisahethae, 450 

 Trihybrids, 136 ff., 142 

 Trillium, 14, 220, 221, 224 

 Tnmerotropis suffusa, 126 

 Triplex, 448, 462 



Triploid, 390, 4OO, 433, 440-442, 470, 

 471, 472, 473 

 and sex, 482 

 in Fritillaria pudica, 222 

 size in, 449, 450, 451 

 sterility of, 441, 442 

 vigor of, 440 

 Triplo-IV, 416. 421 



