728 



Index 



Hormone (s), onset of chemical in- 

 tegration of, 610, 611 

 pigment cell response to, 513, 



514, 515 

 of pro thoracic gland, 641 

 sex. See Sex hormones, 

 skin response to, 505, 506 

 specific action of, 343 



Humoral activity, correlations in 

 development of, 610 



Humoral milieu, 388-389 



Hybridization, 141-146 



Hybrids, androgenetic, 143-146 

 cell degeneration in, 709 

 development of, 141-146 

 developmental abnormalities in, 



708 

 organs of, 388 



Hydrocephalus, 372 



Hydroids. See Tubularia. 



Hyperdactyly, 383 



"Hyperneurotization," 369 



Hyperplasia, 375, 381 



Hypophysis. See Anterior pitui- 

 tary. 



Hypoplasia, 381 



Hypothalamus, 365 



Imaginal discs, 340, 341 



differentiation of, 643-644 

 hormonal control of, 342, 343 

 Immigration of nerve cells, 375 

 Immunological properties, devel- 

 opment of, 556-573 

 Immimology, cross reactions in, 



556, 557, 558 

 Incompatibility of tissues, 371 

 in grafts, 565, 566 

 in vitro, 566 

 Individuation, 259, 280 



neural basis of, 391 

 Induction, 235-238, 243-247, 250- 

 252, 254-256, 265-282, 385, 

 387, 568-570 

 archencephalic, 250-252, 269, 



271 

 assimilative, 244, 248 

 of auditory vesicle, 420-422 

 auto-antibody concept and, 568- 



570 

 by cell iujury, 272-273 

 chains of, 256-257 

 chemical aspects of, 267, 270- 



272, 278-279 

 complementary, 244, 570 

 of cornea, 407 

 of cyclopia, 307 

 cytoplasmic particles in, 285- 



286 

 by dead tissue, 265-269 

 determination by, 338 

 deuterencephalic, 250-252, 269 

 of ear capsule, 422 

 evolutionary aspects of, 264--265 

 of feather papilla, 509 



Induction, field characteristics of, 

 280-281 

 of heart, 442, 443 

 homodynamic, 264--265 

 homoiogenetic, 256 

 kinetic cell properties, effects 



on, 273-276 

 of lens, 404-407 

 of middle ear, 423 

 of nasal placode, 423-424 

 of neural crest, 254-255 

 of non-neural ectodermal struc- 

 tures, 255-256 

 by nucleic acids, 271-272, 285, 



569 

 by organizer, 243-247 

 of otocyst, 258 

 physiological mechanism of, 



265-279 

 potency release in, 304 

 by primitive streak, 306 

 qualitative aspects of, 278- 



279 

 quantitative aspects of, 278 

 in regeneration, 667, 668, 678, 



693 

 by relay, 270-273 

 spino-caudal (trunk-tail), 247, 



250-252, 259, 269, 271 

 in teratogenesis, 706, 707, 708 

 xenoplastic, 246, 263-265 

 Induction fields, 250, 252, 255, 



278, 307, 312 

 Inductor systems, 255-257, 276 

 Inductors, chemical identification 



of, 270-272 

 distribution in animal kingdom 



of, 267-268 

 general properties of, 275-276, 



285-286 

 nucleic acids of, 271-272, 285 

 regional specificity of, 245-247, 



250-252,259-261,269 

 secondary, 256-257, 279-280 

 See also Induction. 

 Inheritance of acquired charac- 

 ters, early views on, 2 

 Innervation, 361 



compensatory increase of, 368 

 density of, 347 

 Insect egg, activation center of, 

 337 



cortical plasm of, 339 



cytoplasmic determiners in, 

 339 



determination in, 337, 338 



developmental interactions 

 in, 341, 342 



differentiation center of, 337 



germ band of, 337 



imaginal discs of, 340, 341 



mosaic vs. regulative types, 

 338 



organ fields in, 340, 341 



pole plasm of, 339 



Insect egg, regulative capacity of, 



557, 338 

 Insect metamorphosis, 645, 648, 

 650, 652-653, 655-656 

 cessation of, 656-657 

 controlling factors in, 637- 



644 

 endocrine relations in, 638, 



639, 640, 641 

 larval molting in, 641-642 

 pupation molt in, 642-644 

 Insects, diapause in, 530-531 

 energy source in embryo of, 



534 

 homoeosis in, 341 

 hormones in differentiation of, 



342, 343 

 progressive differentiation in, 

 337-345 

 Insulin, dosage effects of, 715 

 hereditary differences in sus- 

 ceptibility to, 712 

 sensitive periods to, 713 

 as teratogenic agent, 703, 705, 

 712, 715 

 Insulin secretion, unfolding of 

 regulatory mechanisms of, 607- 

 611 

 Integrated movement, 386 

 Integumentary patterns, 512- 

 515 

 genes and morphology of, 



512,513 

 See also Skin. 

 Interaction of blastomeres, 324- 

 331 

 in echinoderm eggs, 327-331 

 gene-substrate, 164 

 in mosaic eggs, 324--327 

 nucleo-cytoplasmic, 146 

 Interfaces, 352, 356 

 Interference techniques, appraisal 



of, 31-37 

 Intemodes, 367 

 length of, 347 

 Internuncial cells, 380, 383 

 Intestine, coiling of, 456 



regeneration of, 690 

 Intracentral nerve connections, 



expansion of, 391 

 Intracentral nerve tracts, 359 

 Intracentral neurons, 363 

 Inversion experiment, amphibian 



egg, 232, 234 

 Iodine in amphibian metamorpho- 

 sis, 634 

 Islets of Langerhans, 606-611 

 alpha and beta cells in, 580, 

 581, 606, 607 

 secretory activity and, 

 607 

 insulin secretion of, 607 

 morphogenesis of, 606 

 Isoagglutinogens of blood cells, 

 563 



