INDEX 



Activation centre, 75, 



100 

 amphibia, 42,63, 84,91, 



103 

 animal pole, 27 

 armadillo, 87 

 ascidian, 83, 91 

 axial gradients, loi 



Biogenetic law, 20 

 birds, 49, 70, 104 

 blastoderm, 50 

 blastopore, 23 

 blastula, 23 

 budding, lOi 

 butterfly, 109 



Cancer, 18, 116 

 caterpillar, 90 

 cell-division, 28 

 chick, 49, 70 

 chromosomes, 28 

 cinematography, 51, 81 

 cleavage, 36 

 closed-box eggs, 104 

 Communist party, 81 

 competence, 93, 100, 



123 

 cultivation, 51, 58, 118 

 cytoplasm, 27 



Determination, 62 

 developmental fate, 61 

 differentiation centre, 75 

 ductless glands, 115 



Ectoderm, 24 

 egg, 26 

 endoderm, 24 

 entelechy, 98 

 evocator, 85, 95, 116 

 evolution, 19 

 eye, 78, 80, 88, 1 1 1 



Fertilization, 32 

 fish, 49 

 food, 102 

 frogs, 42, 91 

 function, 1 1 1 



Gastrula, 23 

 gene, 32, 119, 122 

 germ cells, 24, 117 

 germ layers, 24 

 germ track, 1 1 7 

 gill slits, 20, 57 

 growth, 109 



Harmonious equipo- 

 tential system, 80 



hereditary factors, 32, 

 119, 122 



hormones, 1 14 



Immortality of germ 



cells, 117 

 immortality, piecemeal, 



individuation, 95 

 induction, 67 

 insects, 73, 90, 100, 109, 

 116 



Joints, 87, III 



Kidney, 82 



Lamprey, 48 

 larva, 90, 116 

 leg, 80 

 lens, 79 

 localization, 86 



Mammals, 54, 72, 105 

 man, 58, 86, 107 

 mendelism, 34 

 mesoderm, 24 

 microsurgery, 63 

 monstrosities, 59 

 mosaic eggs, 83 

 mutation, 32, 39 



Nerves, 1 13 

 neural plate, 44 

 newts, 42, 63, 84 

 nucleus, 13, 16 



Octopus, 88 

 organ - forming sub ■ 

 stances, 83, 118 



organism, 14, 15 

 organizer, 18,69,70,71, 



72, 77>96, 123 

 orientation of particles, 



112 



Parthenogenesis, 35 

 phosphatase, 82 

 placenta, 55, 106 

 presumptive areas, 46 



48,53 

 primitive gut, 23, 41 



46,69 

 primitive streak, 52, 55 

 protoplasm, 16 



Recapitulation, 20 

 recapitulation,chemical 



105 

 reduction division, 30 

 regeneration, 100 

 reptile, 49, 55, 104 



Sea-urchins, 41, 72, 9< 

 secondary organizers, 7 

 self-differentiation, 62 



79 

 sex, 106, 116, 121 

 size of eggs, etc., 26, 6 

 sorting yard, 96 

 speed of developmem 



59 

 sperm, 26, 62 

 stain experiment, 43, 4^ 



51 



Tadpoles, iii 

 turtle, 104 

 twins, 37, 86 

 tying-up experiment, 3 



Uterine milk, 108 



Vegetative pole, 27 

 virgin birth, 35 



Wasps, 87 



waste products, 104 



Yolk, 16 



