Subject Index 



Abdominal segments 165 et seq., 



168 

 Acidity of protoplasm 43 

 Acids, fatty 118 

 Activating centre 69 et seq. 

 — substance 71 

 Activation, in induction 119, 



139, 145 

 — , in regeneration 164 

 — , of egg 19 et seq., 25, 41 

 — , of nuclear factors 71, 85 



et seq., 91 et seq. 

 Activity, metabolic 171 

 — , physiological 171 et seq. 

 — , state of 168, 171 

 Adaptation, functional 6, 155 

 Adenosine triphosphate 65 

 Affinity, tissue 103 

 Agglutination, sperm 11 

 AmUystoma 136, 138, 140, 



143, 153, 155 

 Amoeboid movements 99, 189 

 Amphiaster 16, 20 et seq., 189 

 Amphibia, artificial partheno- 

 genesis 25 et seq. 

 — , bilateral symmetry 40 et 



seq., 48 et seq. 

 — , cell size and body size 67 

 — , centrifugation 48 

 — , cleavage without nuclei 66 

 — , determination of neural plate 



111 et seq. 

 — , development of eyes 128 



et seq. 

 — , explantation of heart 153 

 — , fertilisation 23 

 — , gastrulation 95 et seq., 



101 et seq. 

 — , gradients 48, 62 

 — , heterospermic merogony 



84 et seq. 

 — , hybridisation 78 et seq. 



Amphibia, inversion of egg 48, 104 

 — , neurulation 98 et seq., 106 



et seq. 

 — , polarity 40, 48 

 — , regeneration of limbs and 



tail 172 et seq. 

 — , removal of organ primordia 



151 et seq. 

 — , transplantation of organ 



primordia 152 et seq. 

 Amphimixis 8, 16, 189 

 Androgamones 11, 189 

 Anesthesia 156 

 Anesthetics 163, 164 

 Annelids 92, 162 

 Antifertilizin 11 

 Anurans 134, 136, 138, 139, 



142, 174 

 Apical organ 57 



— region 162 et seq., 167 et seq, 

 Aplysia 62 



Arbacia 78 



Archenteron 44, 78, 83, 93 et 

 seq., 138, 139, 140 



— roof 96 et seq., Ill et seq., 

 131, 136, 138, 147 



Architecture of bones 158 



Arteries 159 



Ascaris 68, 69, 92 



Ascidians 167 



— , bilateral symmetry 41, 58 



— , centrifuging of eggs 59, 



60, 61 

 — , cytoplasmic substances 



57e^ seq., 62, 65 

 — , isolation of blastomeres 59 

 Aster, sperm 15, 16, 17, 22, 



26, 194 

 Atrophy 157, 189 

 Attraction of nerve fibres 156 

 Auditory organ 136 et seq., 



145, 146 



