5o8 



NDEX 



Mendelian "characters", 413 

 Mendelian factors, 72, 397 f. 

 meroblastic cleavage, 39, 40 

 mesenchyme, pluteus, 102, 181 

 mesocardium, 32 



mesoderm, iS, 19, 20, 50, 140, 484 

 Ambly stoma, gradient in, 379 

 and Hmb-field, 223 f. 

 mesomeres, sea-urchin, 102, 104 

 mesonephros, self-differentiation, 199, 

 203, 205, 207 

 and sex-differentiation, 255 

 metameric segmentation, 20, 193, 393 

 metamorphosis, 54, 325, 427 

 metanephros, self-differentiation, 200, 



205 

 metaplasia, 211, 212, 214, 215, 259 

 metastases, 96 

 microcephaly, 332, 338, 339 

 micromeres, Beroe, 105 

 Dentaliimi, 109 

 Nereis, 496 



sea-urchin, 102, 104, 321, 322 

 mid-brain, connective tissue capsule, 



392 

 mitochondria, 124, 217 

 Molluscs, asymmetry, 71, 72, 81, 108, 

 411 

 double monsters, 172 

 organ-forming substances, 116, 216 

 shell-growth, 368 

 monocytes, 213 

 monorhiny, 237, 332, 348 

 monotreme, gonad-asymmetry, 362 



ovary, 264 

 monsters, developmental, 7 



{see also double monsters) 

 morphallaxis, 316 

 morphogenetic field, 274 f., 292 

 morphogenetic substances, 108, 123, 



216 

 morphological differentiation, 30, 33, 



83, 204, 249 

 mosaic development {see also self- 

 differentiation), Urodeles, 56, 194, 

 484, 485 

 chick, limb, 226, 227 

 Ctenophores, 106, 107 

 Rana, brain and eyes, 246 

 Styela, 99, 125 

 mosaic stage, 57, 124, 194 f., 419 

 mosaic-eggs, 70, 98, 105, 108, 215 

 moths, cytoplasmic factors, 405 

 motor load, 383, 384 



moulting-hormones, insect, 174 

 mouth, 31, 179, 498 



differential inhibition, 348, 349 

 multiple potentiality, 325, 326, 363 

 Miisca, precocious chemo-differentia- 



tion, 127 

 muscles, atrophying, and opercular 



histolysis, 429 

 mutual influence, eye- and lens- 

 growth, 422, 424 

 myotome, 20, 28, 32, 220, 193, 393 



inductive capacity, 145, 193, 374 



innervation, 381 

 Myzostoma, polar lobe, 113 



prelocalisation, 119 



narcotics, 287, 301 

 narcotised organiser, 153 f. 

 nasal capsule, 175 

 nasal pit, 31, 180, 203 



nerve-attraction, 391 



neuron-proliferation, 388 

 Nematodes, chromatin-diminution, 

 399, 400 



cleavage, 83 



isolated blastomeres, loi 



mosaic development, 10 1 

 Nemertines, egg-fragments, 120 



isolated blastomeres, 98 



prelocalisation, 120 



regeneration, 211 

 neo-Mendelism, 4 

 neoteny, 403 

 nephrotome, 32, 152 

 Nereis, cataphoresis, 496 



differentiation without cleavage, 132 

 nerve-fibres, connexion with end- 

 organ, 389 



differentiation, 377, 380 

 nerves, trophic effects of, 174, 230, 



363,387,430 

 nervous system and regeneration, 419, 



420 

 neural crest, 31, 33, 193, 199, 393, 



394, 395, 487 



neural fold field, 239, 244 



neural folds, 22, 25, 27, 30, 155, 249, 



373 

 induction of, II, 49, 134 f., 141, 160 



labile determination of, 50, 56, 136, 



137, 138, 373, 492 

 presumptive, 22, 23, 24 

 regulation, 240, 241 

 neural plate, see neural folds 



