542 



Subject Index 



Dorsiventrality, physiological, 178 



reversibility, 170 



in roots, 170 



in shoots, 171 



in thalli, 170 

 Double-worked trees, 258 

 Drosera, 125, 249, 252 

 Drosophila, 429, 431, 442 

 Drought resistance, 326 

 Dryopteris, 69, 70, 72 

 Dwarfs, 260 



genetic, 418 



from immature seeds, 260 



produced, by bark inversion, 259 

 by grafting, 259 



Efficiency index, 16 

 Elaters, differentiation, 191 

 Electrodynamic fields, 361 

 Eleocharis, 246 

 Elodea, 65, 68 

 Embryo culture, 4 

 Embryology of plants, 206 

 Enation, 65, 280 

 Endogenous rhythm, 18, 322 

 Endomitosis, 442 

 Endophyllum, 395 

 Enter omorpha, 135 

 Entwicklungsmechanik, 3 

 Environment, and external differentiation, 

 215 



and internal differentiation, 217 



role in morphogenesis, 451 

 Epilobium, 160, 176, 435 

 Equifinality, 452 

 Equisetum, 58, 137, 179, 203 

 Eriophyces, 279, 280 

 Ethylene, and flower induction, 409 



and root formation, 409 

 Etiolation, 309 



causes, 310 



and cell size, 40 



in fungi, 310 



structural changes in, 310 

 Eucalyptus, 206, 209 

 Evolution, 1 

 Exotrophy, 174 

 Experimental morphology, 3 

 Experimental studies, on cells, 37-43 



on shoot apex, 68-75 



Fagus, 77 

 Faciation, 280 



inheritance, 282 



origin, 281 

 Fibonacci series in phyllotaxy, 152 

 Ficaria, 107 



Field, bioelectrical, 455 



biological, 454 



concept, 454 

 Florigen, 376, 397 

 Flowering, all-or-none reaction, 398 



induction, by growth substances, 398 

 by low temperature, 341 

 by photoperiod, 315 

 Flowering stimulus, in host-parasite rela- 

 tionship, 397 



nonspecificity, 398 



transmitted by grafting, 262, 397 

 Foliar embryos, 127, 250 



factors in growth, 254 

 Foliar helices, 156 

 Fontinalis, 151, 203 

 Form, organic, 1, 117, 449 



and cell division, 52 

 Formativeness inherent in organisms, 425 

 Fractional series, in genetic spiral, 152 



in parastichies, 155 

 Fragaria, 430 

 Fraxinus, 280 

 Friesia, 176 

 Fucus, 4, 50, 56, 117, 121, 135-137, 145, 



169, 178, 233, 372 

 Funaria, 137 

 Functional stimulus, 110 

 Funkia, 256 

 Fusiform initials, 80 



Gall stimulus, specificity, 285 

 Galls, 277-295 



amorphous, caused by parasites, 290 



cataplasmatic, 291 



insect, 283 

 histology, 284 



organoid, 279 



prosoplasmatic, 283 



artificial production, 285 

 Gametophytes, aposporous, 256 

 Gametophytic characters, inheritance, 426 

 Gases, morphogenetic effects, 409 

 Gaylussacia, 329 

 Gemmipary, 250 

 Gene action in development, 415 

 Gene effects transmitted by grafting, 264 

 Generative center in Plantefol's theory, 



156 

 Genes, 415-433 



"compound," 419 



controlling growth relationships, 416, 

 421, 451 



and duration of growth, 417 



and environment, relation between, 451 



as evocators, 425 



and form, 418, 425 



geometric effect, 417 





