Subject Index 



549 



Synchitrium, 284 



Synthetic growth substances, 374, 378, 



391 

 Syringa, 73 



Tagetes, 129 

 Taraxacum, 282 

 Teilungswachstum, 31 

 Temperature as morphogenetic factor, 

 337-344 

 and dormancy, 339 

 and mitosis, 40 

 various effects, 341 

 Tensile stress in development of pri- 



mordia, 160 

 Tension, effect on tensile strength, 347- 

 350 

 formative effects, 351 

 at meristem, 186 

 Teratology, 277 

 Teratomata, 278 

 Tetrakaidecahedron, 53 

 Thermoperiodism and growth, 337 

 Thuja, 84, 171, 174, 214 

 Tilia, 282 



Tilted grain in wood, 166 

 Tissue culture, 73, 75, 222, 296 

 entire organs, 297 



organization of meristems in, 75, 298 

 single cells, 298 

 Tissue mixtures, 258-274 

 Tissue tension, in dead wood, 359 

 distribution, 358 

 effects, 358 

 Tolmiea, 251 



Topiary and correlation, 99 

 Topophysis, 189, 212, 214 



reversibility, 214 

 Torenia, 249, 253, 440 

 Totipotent structures, 102 

 Trace elements, 364 

 Tradescantia, 219, 237 

 Transpiration stream, as functional stim- 

 ulus, 333 

 as morphogenetic factor, 332 

 relation, to leaf area, 333 

 to vascular tissue, 333 

 Traumatin, 376, 403 

 Trichoblast, 131, 190 

 Trichosanthes, 51, 52 

 Trichosclereids, development, 191 

 Trillium, 40 



Trisomies, genetic effects, 446 

 Tropaeolum, 60, 65, 72, 73, 109, 238, 



309, 311, 419, 425, 427 

 Tropisms as morphogenetic phenomena, 



345 

 Tuber-forming stimulus transmitted by 

 grafting, 262 



Tumors, from incompatible crosses, 296 



from tobacco hybrids, 295 

 Tunica in meristems, 62 

 Twin spots, causes, 274 

 2,4-Dichlorophenoxyacetic acid ( 2,4-D ) 

 as herbicide, 407 



Ultrasonics, effects, 354 

 Viva, 56 

 Urtica, 185 

 Ustilago, 280 

 Utricularia, 249 



Valeriana, 185 



Valonia, 132 



Vaucheria, 233, 317, 399 



Vegetative propagation, regeneration in, 



244 

 Vernalization, 315, 339 



chemical, 343 



and day length, 340 



effect, on flowering, 339 



on vegetative characters, 341 



and phasic development, 340 



sensitive region in, 340 

 Viburnum, 313 

 Vicia, 29, 41, 76, 78, 103, 221, 279, 



346 

 Vitamin C and cell size, 37 

 Vitamins in plant development, 373 

 Vitis, 38 

 Volvox, 149 



Water as morphogenetic factor, 324- 

 336 



in air and soil, effects, 329 



experimental work on, 329 



in "water" and "air" forms, 332 

 Water balance and heterophylly, 217 

 Whorls of cells, cause, 128, 289 

 Witches brooms, 280 

 Wound healing, 240 

 Wound hormones, 37, 376, 381, 402 



bean test for, 403 



chemical nature, 402 



and cork formation, 402 



nonspecificity, 402 

 Wound tissue, character, 289 



Xanthisma, 184 

 Xanthium, 397, 398 

 Xeromorphy, 324 



as adaptive character, 324 



causes, 324 



cell size in, 324 



