Index 



733 



Regeneration of nasal placode, 



423 

 oiganizers in. 668 

 physiological. 674, 688-690 

 polarity in, 664 

 population density as factor in, 



671 

 potency of cells in, 667. 679- 



685 

 reconstitutive, 674 

 in reptiles, 686-688 

 reserve cells in, 667, 680 

 respiratory rate in, 672 

 salt balance as factor in. 672 

 of scales, 688 

 in sponges, 668 

 stage of development as factor 



in, 676, 678 

 stimulus for, 666, 667 

 of tail, 675, 686-688 

 in Tubularia, 664. 665. 666, 668, 



669, 670, 671 

 in vertebrates, 674—698 

 Regional host influence, 259-263 

 Regional specificity, competence 



of ectoderm, 258-259 

 host influence on induction, 



259-263, 264 

 inductivity of adult tissues, 265, 



269 

 inductivity of archenteron roof, 



250-252, 254-255 

 organizer, 245-247 

 Regulation, 379, 383. 388 



in embryos in amphibian meta- 

 morphosis, 677 

 in insect eggs, 337. 338, 340 

 Relative growth, 625-627 



concept of transformations in, 

 625, 627 



power equation in, 625-627 

 Repertory of behavioral perform- 

 ances, 392 

 Reptiles, limb-girdle development 



in, 436-437 

 regeneration of epidermis in. 

 689 



of limb in, 686, 687 



of scale in. 687 



of tail in, 686-688 

 Resonance, 383-386 

 Resorption of cells, 375 

 Respiration in absence of cleavage, 



528, 529 

 of amphibian embryos, 526-528 

 in chick development, 523, 524, 



525 

 cyanide-insensitive, 541-542 

 in development, 523-533 

 during diapause of insects, 530, 



531 

 enzyme synthesis, 543-545 

 during gastrulation, 527-528 

 growth and, 525 

 in hybrid development, 530 



Respiration in maintenance and 

 development, 531, 532, 533 

 mechanisms of, 538-543 



citric acid cycle in, 539, 540, 



541 

 in echinoderm eggs, 539-541 

 Embden-Meyerhof scheme 



in, 538, 539, 540, 541 

 schematic representation of, 



539 

 in various species of embryos, 



541 

 Warburg-Keilin system in, 

 539 

 in metabolism and cell division, 



528-530 

 in "no-X" insect eggs, 530 

 rate of, 524, 525, 526 

 in sea urchin development, 524, 

 529 

 Respiratory quotient, 533, 534, 



535 

 Retina, 360, 385 



determination of, 407, 408 

 functional localization in, 403 

 from pigment layer, 410 

 regeneration of, 410 

 Retinal cup, choroid fissure of, 

 403 

 determination of, 402-404 

 environmental influences on, 



403 

 fixation of polarity of, 403 

 regulatory capacity of, 402, 

 403 

 Rhythmic automatisms of nerve 



centers, 392 

 Ring gland, 342, 638 



function of, 643, 644 

 Roentgen irradiation. See X-ir- 



radiation. 

 Rumpless fowl, 700, 701, 702, 703, 

 704, 710. 711, 712, 714 

 degeneration processes in, 



702. 710 

 embryology of, 702. 703, 710, 



714 

 phenocopies in, 703 

 seasonal changes of incidence 



of, 711 

 sensitive periods for insulin- 

 produced, 713 



Sarcoma, 370, 381 

 "Saturation," 366, 367-370 

 "Scar," 350, 352. 356, 360, 367 

 Schwann cells. 347, 350, 356, 358, 



366, 367, 372 

 Schwann cords, 349, 362 

 Sea urchin egg, animal half re- 

 sponse of, 328 

 animalizing influence on, 



327-331 

 developmental modifica- 

 tion of, 327-331 



Sea urchin egg, dispermy in, 139, 

 140, 151 

 gradients in, 665, 666 

 double system of, 330 

 single system of, 330- 

 331 

 respiration of, 524, 529 

 self-differentiation in, 328, 



329 

 vegetalizing influence on, 

 327-331 

 Selective contact affinities, 362 

 "Selective fasciculation," 366, 



380, 384 

 Selectivity, 356, 363. 366 

 Self-differentiation. 378, 387 

 Self-organization, 281, 304, 305 

 in brain-eye field, 253. 254 

 in chorda-mesoderm field, 240, 



243-244, 281 

 in explants, 261, 273,282 

 role of gradients in, 284 

 Sensitive periods in teratogenesis, 



702. 705, 712-714, 715 

 Sensory nervous system, suppres- 

 sion of, 392 

 Sensory neurons, 385 



qualitative diversity among, 

 380 

 Sex differentiation, dominant 

 gonad component in, 475 

 environmental agencies in, 



475 

 hormonal control of. 475- 

 477 

 patterns of, 483-484 

 hormonal theory of, 483 

 monhormonic theory of, 484 

 Sex ducts, castration effects on, 

 482-483 

 hormone effects on, 480-481 

 Sex hormones, effects on cloaca 

 and urinogenital sinus. 

 481-482 

 embryonic vs. adult, 485-486 

 inductor substances and, 486 

 mode of action of, 484-485 

 "paradoxical" effects of, 476, 



481 

 specificity of action of, 485 

 time of production and libera- 

 tion of, 593-595 

 Sex reversal in freemartin, 475, 

 477 

 by grafting. 476, 478, 479 

 by hormone administration, 

 476-477, 479-482 

 Sex structures, accessory, 595, 

 596, 597, 598. See also Genital 

 structures, accessory. 

 Sexual behavior, hormonal effects 



on. 389 

 Sheath cells. See Schwann cells. 

 Situs inversus of gut and heart, 

 457, 458 



