504 



NDEX 



electric current, 60 



"emboitement", Bonnet's theory of, 3 



embryo, 13 



end-organs, 389 



endoderm, amphibia, 18, 20, 483 



bird, 159 f. 



rat, 201 

 endolymphatic duct, 31 

 endothelium, heart, 32 

 entelechies, Driesch's theory of, 9, 352 

 Entwicklungsmechanik, 9 

 environment, 8, 59 

 ependyma cells, 33 

 epiboly, 16 



epidermis, amphibian, differentiation, 

 140, 482, 489 



amphibian, explanted, 203 



chick, differentiation, 267 



growth-tendency, 41 



polarity, 235, 488 



post-generation, 92 



presumptive, 22, 23, 24, 26 

 epidermis-field, 235 

 epigenesis, i f., 58 

 epiphysis, determination, 245 

 equator, amphibian egg, 22 

 equilibrium, gradient-field, 276, 305, 

 310 



growth-, 367 

 equivalence of nuclei, 85 f., 87, 397 

 exo-embryo, amphibian, 482 f. 

 exogastrula, 103, 323, 334, 336, 481 f. 

 experimental embryology, 11 

 explantation, amphibian tissues, 55, 

 139, 194, 202, 203 



chick tissues, 196, 200, 201, 204, 206 



insect tissues, 173 f. 

 external factors, 279, 312 

 extra-embryonic blastoderm, 327 

 eye, differentiation, Amphibia, 182 



differentiation, chick, 204, 267 



extirpation, Rana, 388 



lens-induction, 51, 54, 183 f., 184, 

 185, 188, 237 



mosaic development, chick, 199 

 mosaic development, Rana, 246 

 self-differentiation, Bonibiriator ,■ 46, 



self-differentiation, chick, 201 



self-differentiation, Rana, 248 



size-regulation, 242 

 eye-field. Amphibia, 244 

 eye-graft, nerve-attraction, 391 



neuron, proliferation, 388 



eye-growth and lens-growth, 422, 424 

 eye-induction. Amphibia, 147 

 eye-pigmentation, Gammarus, 409, 

 410 



fat, in frog's egg, 220, 320 

 feather-bud, differentiation, 268 

 feathers, growth-gradient, 369 

 fertilisation, 13 

 fibroblasts, differentiation, 433 



growth, 370 



metaplasia, chick, 214, 215 



metaplasia, Pecten, 212, 213 



tissue-culture, 179, 209 

 field, 221, 274 



of direct and indirect action, 311 



susceptibility of, to thyroid, 427 

 field-gradient system, 274 f., 405 

 Filigrana, head, inductive capacity, 



290 

 fish, double monsters, 329, 331 



larval hybrids, 405 



organ-rudiments, 201 



plasticity, 100 



thyroid tumour, 392 

 flatfish, asymmetry, 70 

 fore-limb, induction, 193, 231, 363 



polarity and laterality, 224, 357, 



358 

 fore-limb field, Amhlystoma, 222, 223, 



224 

 formative stimulus, 134, 193 

 form-change, 30 

 form-differentiation, 196 

 fowls, spurs of, 269 

 frog, centrifugalisation of egg, 40, 

 219, 220 



cyclopia, 347 



cytoplasm of egg, 91 



dorsal lip of blastopore, 38, 95, 321 



double monsters, 95, 261, 329 



fields, susceptibility to thyroid, 190, 

 427 



gdl-field, 233 



gonad-differentiation, 257, 262 



neural tube, 182 



operculum perforation, 180, 428, 

 429 



partial embryos, 92 



sex-differentiation, 255 f., 257 



tumour-like growth, 96 

 frog's egg, bilaterality, 14, 37, 38, 67 



cleavage, 40, 85, 404 



delayed fertilisation, 96, 261, 262 



