INDEX 



805 



Gadus, embryonic differential susceptibility 



of, 149 

 Gastrulation: in echinoderms, 137, 236, 440, 

 443, 445; in Phialidiiim, 167; in differen- 

 tially inhibited amphibian embryos, 259; 

 induced by implanted sea-urchin micro- 

 meres, 440; regional migrations in verte- 

 brate, 447, 449, 451, 453; and induction in 

 amphibians, 454 

 Glycogen, in amphibian embryo, 156, 477 

 Glycolysis: and susceptibility, 76; in am- 

 phibian embryo, 154; in amphibian induc- 

 tion, 477 

 Gradients, concentration: in echinoderm de- 

 velopment, 129, 140, 227, 241, 243, 436, 

 507, 508, 509, 513; action of external 

 agents on, 227, 242, 243, 245; in relation 

 to activity gradients, 241, 272, 513; in re- 

 lation to protein configuration, 697; as 

 basis of symmetry and asymmetry, 700; 

 as results of physiological pattern, 702 

 Gradients, physiological: as features of de- 

 velopmental pattern, 7, 270, 272, 432, 485, 

 700, 703; of buds, 16; reconstitutional dif- 

 ferentials as evidence of, 31; embryonic 

 and functional differentials as evidence of, 

 53; in mammalian intestine, 56; experi- 

 mental methods of demonstrating and in- 

 dicating, chap, iii, 723; of algae, 86; of 

 higher plants, 88; of Paramecium, 90; of 

 other protozoa, 94; of sponges, 96; of hy- 

 droids, 96; of a siphonophore, 104; of 

 scyphozoa and actinozoa, 105; of cteno- 

 phores, 108; of planarians, 108; of poly- 

 clads, 117; of annelids, 119; in echinoderm 

 development, 129, chap, vi, 436, 723; in 

 beetle embryo, 144; in Drosophila ovary, 

 144; in ascidian embryo, 145, 250; of 

 lamprey embryo, 147; of teleost embryo, 

 150; of embryonic vertebrate heart, 150, 

 162; in amphibian development, 151, 163, 

 256, 258; of chick embryo, 159, 162, 265; 

 differential modifications of, chaps, v, vi, 

 vii; mediolateral, in planarian head, 180, 

 190, 724; experimental obliteration of, 

 168, 201, 202, 208, 215, 216, 225, 228, 231, 

 259, 416, 539; in insect development, 

 250, 518; experimental determination of, 

 273, 413; origin of specific differences 

 from, 274, 297; as co-ordinate system, 274; 

 relation of, to field, 277; in relation to 

 metabolism, 280; in amphibian limb field, 

 285, 293; in harmonious-equipotential 

 system, 290; dominance of high regions of, 

 304; localization of central nervous system 

 in high regions of, 305; auxin transport 

 and, 310; progressive extension of, 332; 

 in amphibian lens regeneration, 396; in 

 relation to implanted sea-urchin micro- 

 meres, 440, 444; in relation to embryonic 

 cell movements, 450, 454; in amphibian 

 dorsal inductor, 459, 460; in amphibian 



presumptive neural region, 466 ; of amphib- 

 ian induced embryo, 468; in effects of 

 foreign inductors, 473; in amphibian lens 

 induction, 490; in otic induction, 497, 498; 

 and "double assurance," 501; and induc- 

 tion in general, 502; in embryonic sea- 

 urchin reconstitution, 506, 508, 509; in 

 polyembryony, 537, 538, 539; in relation 

 to egg cortex, 588; in Polys pondyliumfiig; 

 of diatomaceous pseudothallus, 641; in re- 

 lation to embryonic symmetry and asym- 

 metry, 673; in relation to protein con- 

 figuration, 697; hypotheses concerning, 

 700; most primitive type of organismic, 

 702; in relation to organism as a whole, 

 703; and "machines" of Driesch, 703; ini- 

 tiation and character of, 704, 727; changes 

 of, in evolution of form, 723; in relation to 

 genetic change, 727. See also Condition- 

 ing; Gradients, concentration; Gradients, 

 respiratory; Inhibition; Pattern, develop- 

 mental; Pattern, ultrastructural; Recon- 

 stitution; Recovery, differential; Tolerance 

 Gradients, respiratory: of Corymorpha, 98; of 

 Tubularia, 99; of Obelia, 99; of planarians, 

 108; of Stylochus, 117; of annelids, 121; of 

 amphibian embryo, 153; of chick embryo, 

 159; other data and discussion concerning, 

 729. See also Gradients, physiological 



Gravity: in relation to plant pattern, 422, 

 430; and Antenmdaria polarity, 422; and 

 amphibian development, 428; and dorsi- 

 ventrality of liverwort gemmae, 430 



Griffithsia: polarity determined by electric 

 current in, 421; polarity determined by 

 centrifuging in, 422 



Growth: allometric, 55, 723; definitions of, 

 715; negative, 716; in relation to develop- 

 ment, 716; differential, 717; in earlier and 

 later stages, 717; species-specific, 718; 

 gradients of, 720, 724; inorganic, 722; 

 mathematical analyses of, 722; in evolu- 

 tion of form, 724 



Guinea pig, inhibited head forms of, 268 



Haliclysius: reconstitution of, 40, 50, 319, 

 326; biaxiate forms of, 335 



Harenactis: reconstitution gradient in, 40; bi- 

 polar forms of, 41; symmetry in reconsti- 

 tution of, 336; new axiate pattern in rings 

 of, 372; mirror-imaging in, 387 



Harmonious-equipotential system: concept 

 of, 290; early sea-urchin embryo as, 505 



Head frequencies: in planarians, 181; factors 

 determining, 194, 400, 406, 408 



Heart: gradient in embryonic, 150, 162, 163; 

 differential inhibition of embryonic fish, 

 257; differential inhibition of embryonic 

 chick, 266; dominance and physiological 

 isolation in, 328; reversal of dominance 



