468 Subject Index 



Tissue cultures. 105, 196, 21 1, LM5. 216. 

 219, 223, 257, 374, 379, 3X0, 385, 412 

 arrested metaphases in, 17, 373 

 cancer cells, 258 

 cellular multiplication, 219 

 chick heart, 418 

 colchicine derivatives, 41 1-12 

 fihrohlast cultures, 30, 44, 215-16, 418, 



420, 421 

 hanging drop preparations of, 378 

 of Heliauthiis, 105 

 metliods, 17 



methylene hlue stain, 91 

 mitotic stimulation in, 379 

 rabbit heart, 418 

 studv of mitosis by, 17, 337, 375 

 iji vitro, malignant. 17, 257 

 in vitro, normal, 17, 172, 257 

 in vivo, malignant, 17, 257 

 in viiH), normal. 17 

 Tobacco. 26. 279, 294; see also Nicotianu 

 Toes, regressive evolution of, 209 

 Tomato', 104, 325 



autotetraploid, 325 

 Tool for study of growth, 378 

 Toxicity of colchicine, 3, 94, 96, 121, 195 

 cimiulati\e, 196 

 low, in plants, 383 

 nonspecific toxic reactions, 379 

 variations in, 194 

 rradescantia, 32, 69, 73-74, 111. 113. 170- 

 71, 392, 399, 415; see also Slaminal 

 hair cell 

 c-meiosis, 1 15 

 embryo sac, 117, 118 

 flower, 109 

 microspores, 115 

 pistil, 109 



pollen mother cells. 111 

 polynucleate cells, 115 

 stem, 106 

 style, 109 

 Transformations of chromosomes, 50-52 

 Treatment with colchicine; see Tech- 

 niques of colchicine treatment 

 Triatoma infestans, 205 

 Tribromo acid, 169 

 T(//o//n;», 321-22 



amphiploid of; T. repens x T. nigres- 



cens,iV> 

 species of; hybridum, 322; pratense, 

 322; repens, 322 

 Trimetaphasc, 83 

 Trimetho\v-3-methvlnaphthalcne-l:2- 



dicarboxylic anhydride, 166 

 Trimethylcolchicinic acid, 160, 40f-5, 

 408-9 

 di-benzoylation of, 166 

 Trimethvlcokhicinic acid methvl 



ether, 408 

 Trinidad, 288 



Triploid, 326-33, 381,382 

 alio-, 326 

 apples. 333 

 auto-, 326. 327 



fruit bv diploid pollin;ilions, 327 

 fruits. 333 

 guava. 333 



natural species of. 326 

 optimal number at, 327 

 parthenocarpy, 329 

 propagation of seed for, 328 

 seed production for. 327 

 seedless fruits of. 327 

 source for aneuploids. 354 

 sugar beets, 331-33 

 from tetraploid parents. 327 

 in watermelon, 327-31 

 Tripneustes escnlentus, 88 

 Trisomies, 355 



Trispecies hybrids, in Gossypiinn, 306 

 Triticales, 300-301 



homology of chromosomes between 



rye and wheat, 300 

 Lebecieft, 300 

 meiotic irregularity, 300 

 Meister, 300 

 Miintzing. 300 

 Rimpan," 300 

 stability of, 300 

 Taylor, 1935, 300 

 vegetative propagation, 300-301 

 Triticinae, 362 



Triticiim, 95, 277, 287, 288, 354; see also 

 Tritieales 

 cell plates, 95 

 a hexaploid species in, 358 

 with hybridization, 296 

 monosomies of, 358 

 multipolar groups, 95 

 ludlisomics of, 357-59 

 oriffin of, without hvbridi/ation. 297 

 root tips, 403 



species of: aestivuiu. 279. 397; dicoc- 

 coides, 295; dicoeeuni, 297; iiiono- 

 coceuni, 295, 298; polonicum, 358; 

 spelta, 295; tinioplieevi, 298 

 test of spindle poison, 403 

 Triticuni amphiploids, intergeneric 



T. aesliviiin x -^gropyron irlaueiini. 



298 

 T. aestiviiin x --igropxion inter- 

 medium, 298 

 T. aestivum x Secale cereale, 300 

 T. dicoccoides X Aegilops sqnarrosa. 



295 

 T. dicoccum X Aegilops s(juarrosa, 



297 

 T. persiciun x Aegilops sijiiarrosa, 

 296 

 Trito7i 

 arrested metaphases percentage, 40 



