INDEX 



Bold type denotes pages on which figures zvill be found. 



abdomen, Brachyura, growth, 367, 422 

 acceleration, differential, Macropodus, 



344, 345 

 Acipenser, auditory capsule, 175 f. 

 activating centre, Platycnemis, 170 

 activation of egg, 15 

 activity-gradient, 67 f., 81, 276 f. 

 adrenal, mosaic development, 199 

 adult, 354 

 Aeolosoma, differential susceptibility, 



275, 277 

 age, fibroblasts, 210 

 Ambly stoma {see also axolotl), auditory 

 capsule, 175 



balancer-field, 177, 236 



differential susceptibility, 378, 379 



ear-field, 233 



exogastrulation, 481 



eye and lens growth, 422, 424 



fore-limb, 357, 358 



fore-limb field, 222, 223, 224 



gill-field, 233 



limb growth-rates, 421 



limb-innervation, 389, 390 



neural crest, 393 



neural fold field, 243 



neural tube, 376 



neuron-differentiation, 381, 384, 

 386 



organiser, heteroplastic grafts, 142 



sensory load, 365 



shoulder-girdle, 281 



temperature-gradient, 342 



visceral cartilage, 394 

 Amiurus, taste-buds, 174, 431 

 Ammonites, shell-growth, 369 

 amnion, Echinoderms, 180 

 Amniotes, embryonic membranes. 327 



sex-differentiation, 255 f. 

 amoebocytes, 211 

 Amphibia {see a/50 Anura, Urodela), 13 



blastomeres isolated, 53, 89 f., 98 



gradient-system, 437 



larval hybrids, 405 



limb-region, 304 



metamorphosis, 427 



organ-rudiments, 199 



organiser, ii, 12, 49, 50 f., 51, 52, 



80 f., 89, 134 f., 149, 15^, 3io> 

 3H f., 327, 490 f. 



rudiments explanted, 203 



sex-differentiation, 255, 257, 260 

 Amphioxus , asymmetry, 70, 79 80 



blastomeres, 100 



double monsters, 123, 328 



gastrulation, 16 



neural tube, 375 



partial larvae, 123 



polarity, 63 



prelocalisation, 119 



regulation, 126 

 Afiableps, asymmetry, 70 

 " aneurogenic " limb-bud, 378 

 "anidian" blastoderms, 367 

 Annelids, axial gradients, 278 



differential susceptibility, 332 



double monsters, 172, 330 



gradient, 309, 320, 496 



operculum, 71 



organ-forming substances, 116 



prelocalisation, 119, 495 



regeneration, 281 



tail-region, dependence, 283 

 antagonism, sex-differentiation, 260 

 antenna, Copepod, growth, 367 



regeneration, 360, 361 

 ants, chemo-differentiation, 127 

 Anura, 13, 91, 427 



sex-differentiation, 255 

 Anuran organiser in Urodele host, 141 

 anus, 31 



apical organ, Dentalium, no, III, 112 

 apical point, 330 

 apical region, 288, 292 



autonomy of, 283 



inductive capacity, 286 

 Arbacia, bilateral symmetry, 69 



centrifugalisation, 217, 218 



cleavage, 83 



differential susceptibility, 335 



polarity, 66 

 archenteron, 16 



Arenicola, differential susceptibility, 

 334 



32-2 



