INDEX 



503 



differential susceptibility, Aeolosoma, 

 275, 277 

 Ainblystoyna, 378, 379 

 Chaetopterus, 332 f., 333 

 frog's egg, 68 

 Fiindulns, 344 

 Macropodus, 345 

 Perophora, 293 

 Planarians, 301, 303 

 sea-urchins, 335, 336 

 differentiating centre, Platyaiemis, 171 

 differentiation, 7, 34, 58 



dependent, see dependent-differen- 

 tiation 

 functional, 13, 34, 418 f., 435 

 histological, 33, 204, 249, 267, 375 

 morphological, 30, 33. 83, 249 

 neuron-, 377, 380 

 self-, see self-differentiation 

 and size, 418, 419 

 typical and atypical, 314, 315, 3^6 

 diminution, chromatin-, 399, 400 

 disintegration, 68 

 dispermy, frog, 37 

 sea-urchin, 403 

 dissociation, Cory?norpha, 288 



sponge, 65, 250, 282 

 Dixippus, antenna regeneration, 36 1 

 dog, bladder, 434 

 dominance, apical region, 285 f. 

 limb, 305 



physiological, Stetiostomutn, 294,295 

 dominant region, 308, 316, 325 

 dorsal crest field, Triton, 363 

 dorsal fin, axolotl, 423, 424 

 dorsal half-embryo, Triton, 52, 53, 88, 



239, 240 

 dorsal lip, blastopore, amphibian, i6, 



38, 40, 50, 67 f., 134 f-. 321 

 dorsal meridian, egg, amphibian, 14, 



21,37,67 

 dorsal nerve-root, 33 



ganglia, 31, 220, 393 

 dorso-ventral axis, sea-urchin, 69 

 "double assurance", 57, 139, 187,492 

 double monsters, 103, 105 

 Amphioxus, 80, 328 

 birds, 329 



Chaetopterus, 114, 328 

 Clepsine, 114, 328 

 earthworms, 329 

 Echinoderms, 105, 168, 169, 328 

 fish, 329 

 frog, 93 f., 261, 329 



double monsters, Fimdulus, 329 

 Patiria, 328 

 scorpions, 329 

 Triton, 90, 155, 156, 157, 158, 329, 



351, 352 



trout, 329, 331 



Tnbifex, 113, 328 

 dragon-fly, activating centre, 170 



chemo-differentiation, 127 



cleavage, nuclear equality, 88 



differentiating centre, 171 

 Drosophila, genes, 397 

 duck, organiser, 159 

 duplicitas anterior, 156 f., 350, 351, 



352 



duplicitas cruciata, 95, 113, 155, 15^, 



157, 128 

 duplicitas posterior, 156 f. 

 dynamic determination, 54, 149, 163, 



250, 301 



ear, mosaic development, 199 

 ear-field, 232 



polarity, 360 

 ear-vesicle, and capsule-induction, 175 



differentiation, 31 



explanted, amphibian, 203 



explanted, chick, 205 



induction, 147, 192 



and limb-induction, 231 



self-orientation, 208 

 earthworms, double monsters, 329 



gradients, 274, 275, 277 



regeneration, 420 

 Echinocyamus, skeleton, 181 

 Echinoderms, asymmetry, 73 



bilateral symmetry, 68 



blastomeres isolated, 98 



centrifugalisation, 218, 221 



cleavage, loi f., 130 



dependent differentiation, 180 f. 



gradients, 320 



hydrocoel and amnion, 180 



larval hybrids, 405 



organiser, 166 f., 169, 323 



polarity, 312 



regional potencies, loi f. 

 echinopluteus, 81 

 Echinus, cytoplasmo-nuclear ratio, 132 



larval hybrid, 404 



larval skeleton, 181 

 ectoderm, 18 



gradient in, Ambly stoma, 379 

 egg-axis, 18, 35, 79, 191 



