INDEX 



511 



Rana fusca {temporaria) , eye-extirpa- 

 tion, 388 

 lens-differentiation, 183 f. 

 nervous system and leg-develop- 

 ment, 430 

 nose-field, 237 

 Rana jiigromaculata, ear-field, 232 

 Ra7ia palustris, neuron-differentiation, 



377 

 and sylvatica, composite embryo, 



407 



and sylvatica, lateral line, 355, 356, 



357 



visceral cartilages, 395 

 range of dominance, 285, 287 

 rat, tissues explanted, 201, 268 

 rate-genes, 409, 410 

 raw materials, 219 f., 311, 320 

 realisation-factor, 280 

 recapitulation, Haeckel's theory of, 8 

 reconstitution, Corymorpha, 284 



Pennaria, 66 



scale of, 288 



Sycon, 65, 282 



Tubidaria, 287 

 redifferentiation, 179, 211, 431 



Clavellina, 287 



Corymorpha, 65 

 reduplication, limbs, 224, 327, 358, 



363 

 regeneration, 58, 63, 193, 195, 197, 

 271 f., 304, 306, 307, 350, 360, 

 361, 406, 419 

 lack of, after field-extirpation, 365 

 lack of, during mosaic phase, 58, 195 

 lens, 187, 237 



limbs, Urodele, 271, 304, 306, 307 

 Limibriculus, 308 

 Nemertines, 211 



Planarians, 271, 286, 298, 308, 326 

 regional differentiation, organiser, 



amphibian, 147, 490 f. 

 regional effects, 411 

 regional factors, 177, 191, 192 

 regional field, 229, 354, 362 

 regional potencies, sea-urchin, loi, 



104 

 regulation, 58, 93, 98, 126 f., 195, 215, 



350, 373, 419 

 Ascidians, 124 

 Ctenophores, 107 

 eye-size, Triton, 242 

 heart, 235 

 neural fold field, 239, 240, 241, 244 



regulation, Platycnemis, 127, 128 



Triton, eyes, 242 



Triton, neural folds, 239, 240, 241, 

 244 

 regulation-eggs, 70, 98 f. 

 reptiles, extra-embryonic blastoderm, 



327 

 resonance theory, 391 

 resorption, 294, 299, 325 

 restriction of potencies, 260 

 rete tissue, 255 

 retina, 33, 204, 244, 248, 249 

 Rohon-Beard cells, 382 



Sabella, organiser, 165, 288, 289 

 Salamandra, gills, functional differen- 

 tiation, 435, 436 



metamorphosis, the psychological 

 changes, 396 



pigment-cells, 426 



regeneration, 366 

 salivary gland, 179 

 Salmacina, organiser, 290 

 "saturation", nerve-attraction, 392 



organiser-action, 310 

 scale of reconstitution, 287, 288 

 scales, Lymantria, 172 



tail-regeneration, lizards, 372 

 Scaphopoda, shell-growth, 369 

 Sciara, chromosome-elimination, 401 

 scorpions, double monsters, 329 

 sea-urchins (see also Arbacia, Cid- 

 aris, Echinocyamus, Echinoderms, 

 Echinus, Lytechiniis, Paracejitrotus, 

 pluteus, Psammechinus, Sphaere^ 

 chinas, Tripneustes) , bilateral sym- 

 metry, 69 



calcium-free water, 401, 402 



centrifugalisation, 217, 218 



cleavage, 83, 84, 128 f., 130 



cytoplasmo-nuclear ratio, 132 



dependent differentiation, 174 



differential inhibition, 335, 336 



differential susceptibility, 334, 335 



differentiation, 252 



double monsters, 103, 105, 168 



larval hybrids, 404, 408 



organiser, 166 f., 169, 321, 322, 325 



partial larvae, 102 



polarity, 60, 313 



regional potencies, 102, 104 



regulation, 97, 102 

 seakale root, regeneration, 297 

 secondary induction, 57 



