Index 



727 



Genital structures, accessory, 477- 

 483 

 castration effects on, 482- 



483 

 gonad grafting effects on, 



478-479 

 hormone administration ef- 

 fects on, 479-482 

 See also Sex structures, ac- 

 cessory. 

 Genital system, 470-486 

 Germ cells, determination of, 174 

 gonad formation and, 175- 



177 

 origin of, 170-177 



in insects, 339 

 site of origin, 175, 176, 177 

 Germ ring (teleost) , 299, 300, 302, 

 305 

 axial structures and, 305 

 Gill formation, entodermal role 



in, 455 

 Girdle, development of, 434-435, 



436-437 

 Glands, regeneration of, 690 

 Glia cells, pulsations of, 364 

 Golgi system in cells, 45 

 Gonad, cortex and medulla of, 470 

 formation of, 473 

 germ cells of, 470, 471-473 

 localization of structural ele- 

 ments in, 470-471 

 onset of hormone activity in, 



578, 593-595 

 origin of, germ cells and, 175- 



177 

 reciprocal action on anterior 



pituitary, 599 

 responsiveness to gonadotroph- 



ins, 597-598 

 sex differentiation of, 475-477 

 sex reversal of, 475 

 sex-specific organization of, 474 

 sexually indifferent, 470 

 sterile, 473 

 Gonad-forming area, 471, 474 



map of, 464 

 Gonaducts. See Sex ducts. 

 Gradient fields in archenteron in- 

 ductivity, 255 

 of brain-eye, 252, 253 

 in lens inductivity, 278 

 in mesodermal mantle of neu- 

 rula, 248 

 Gradients, 234, 282-284, 356 

 in armelid regeneration, 665 

 axial, 282, 665 

 concentration, 356, 358 

 double theory of, 234, 283 

 inside-outside, 283-284 

 in pH, 350 

 of reaction in feather papilla, 



515 

 in sea urchin egg, 330-331, 665, 



Gi af t incompatibility, 565 

 Graft tolerance, induction of, 566 

 Gray crescent, 230-232, 233 

 Gray matter, 363, 367 

 "Ground substances," 352, 360 

 Group relations (CNS), develop- 

 ment of, 366-370 

 Growth, antibody stimulation of, 

 569 

 cell division and enlargement 



to, 624 

 of cells, 375, 381 

 of chimeric eye, 408 

 complexity of factors in, 602, 



605, 606 

 curves of, 623, 624 

 definition of, 520, 521 

 differential, 353, 360, 365, 374 

 energy requirements in, 521, 



522 

 of eye, 407-409 

 of eye muscles, 409 

 formal treatment of, 30 

 glutathione concentration and, 



623 

 gradient of, 625, 627 

 hormonal activation of, 343 

 hormonal interaction in, 600, 



601, 602, 603, 604 

 hormones in, 342, 343 

 inhibition of, 623 

 internal force and, 624 

 intrinsic capacity for, 603, 605, 



606 

 moulting and, 342, 343 

 of oocyte, 177-180 

 pattern, 373-376 

 potential, 350 

 pressure, 368 



rates of, 375-376, 622, 623-625 

 during embryonic period, 

 622, 623 

 of regenerating organs (or 



parts), 627 

 regulation in eye and limb, 628 

 relative. See Relative growth, 

 respiratory increase and, 525, 



526 

 self -duplicating entities in, 567 

 temperature and, 628, 629 

 of tooth, 492-497 

 Growth hormone, history of con- 

 cept, 600 

 onset of activity, 580, 604, 605 

 synergistic action of, 601, 

 602, 603, 604, 605 

 Guide structures, 353, 354, 359 

 Gut formation, mesodermal role 

 in, 311 



Hair, dermal papilla of, 510 

 as inductor of, 510 

 primordia of, 509 

 stages in foi-mation of, 509, 510, 

 511 



Hair papilla, components of, 510 

 Haploidy and development, 130- 



134 

 Haptens, cross reactions with, 557, 



558 

 Harmonious morphological sys- 

 tem of limb and girdle, 434 

 Head structures, amphibian, re- 

 generation of, 685 

 Heart, determination of, 443, 444 

 duplication of, 445, 446 

 induction of, 442, 443 

 localization of, 440, 441, 442 

 organogenesis of, 440-450 

 primordia of, 440, 443, 444 

 axial determination of, 445 

 polarity of, 445 

 self-differentiation of, 443, 



444 

 totipotency of, 445, 446 

 self-differentiation of, 443, 444 

 Heart (embryonic), beat rate of, 

 448 

 electrocardiogram of, 448, 



449 

 initial contractions of, 446, 



447, 448 

 initial striations of, 448 

 innervation of, 450 

 intrinsic rhythms of, 448, 449 

 myogenic contractions of, 



449, 450 

 nervous control of, 449-450 

 pacemaker of, 447, 450 

 "tubular" formation of, 446, 

 447 

 Heart-forming area, 310, 441, 442, 

 443 

 map of, 443 



organizing role of, 311 

 Hereditary factors, phenocopies 

 of, 702-703 

 in teratogenesis, 700-701 

 Hindbrain, 389 

 Histogenesis, 576-581 



of anterior pituitary, 578, 579, 

 580, 582, 583, 590, 599 

 in dwarf mouse, 605 

 Homeotic mutants, 161 

 Homoeosis in insects, 341 

 Hormone (s), action in insects, 

 638-644 

 of brain, 640 

 of corpus allatum, 641 

 in development, 347, 388, 574- 



619 

 in differentiation, 342, 343 

 feather papilla response to, 507 

 functional interlocking of, 602, 



603, 604, 605, 610 

 growth and, 343 

 in insects, 342, 343 

 local action of, 389, 583, 594 

 metamorphic mechanism and, 

 653-656 



