



INDEX 





Abnormality, in centrifuged eggs, 73, 

 80 ; in dispermic eggs, 93 ; in eggs 

 under pressure, 65 ; in hybrid 

 larvae, 97. 



Absorption of water, see Water. 



Acids in artificial parthenogenesis, 

 40. 



Acrosome, 24, 27 ; function of, 89. 



Aegineta, 71. 



Agronidae, 112. 



Alkalinity of sea-water, affecting 

 hybrid larvae, 106. 



Alkalis in artificial parthenogenesis, 

 40. 



Alternation in direction of division, 

 59 ; in spiral cleavage, 51. 



Alveolar structure of egg cytoplasm, 

 42. 



Amblystoma, 111. 



Amoeba, 88. 



Amphiaster, 46. 



Amphiaster-monaster, 90. 



Amphibia, formation of cornea in, 

 110 ; inversion experiments in, 

 111 ; stratification in eggs of, 78. 



Amphikaryotic, 53. 



Amphioxus, 69 ; symmetry of, 72. 



Amphitrite, 40, 46. 



Animal pole, 2, 7. 



Annelids, 68. 



Antedon, hybridization, 95. 



Apical organ, 5 ; absence of, in larvae 

 from egg-fragments, 73 ; formed in 

 posterior half gastrulae, 77 ; pre- 

 formation of, 76. 



Arbacia, artificial parthenogenesis, 

 37, 106 ; centrifuged eggs of, 81 ; 

 cross-fertilization, 106, 107 ; effect 

 of salts on egg of, 44. 



Archenteron, 3, 5, 10, 71, 95. 



Arrhenokaryosis, 53, 54. 



Artificial parthenogenesis, see Par- 

 thenogenesis. 



Ascaris megalocephala, cell-lineage 

 in, 14 ; centrifuged eggs of, 84 ; 

 cleavage of, 11, 13 (fig.), 49 ; dimi- 

 nution of chromosomes in, 11 ; di- 

 spermic eggs of, 86 ; isolated blas- 

 tomeres of, 74 ; totipotence of egg- 

 fragments of, 76. 



Ascidian, 59, 69, 72, 74. 



Asterias, 40 ; hybridization, 94. 



Auditory vesicle, 11 ; transplanta- 

 tion of, 110. 



Audouinia, 96. 



Axes of embryo, see Embryonic axes. 



Axis of egg, see Egg-axis ; of polarity, 

 change in, 85, 86. 



Axolotl, definitive centrosome in, 

 32 ; fertilization, 28, 30, 31 (figs.) ; 

 maturation division, 26 (fig.). 



Baltzer, F., 94, 95, 106. 



Bataillon, E., 40. 



Bilateral cleavage, see Segmentation. 



Bilateral-symmetry, see Symmetry. 



Bipinnaria, 95. 



Blastomeres, behaviour of isolated, 

 63, 66, 67, 71 ; coating film of, 49 ; 

 effect of gravity on, 63 ; killed by 

 hot needle, 61 ; killed by ultra- 

 violet light, 74 ; separation in cal- 

 cium-free sea-water, 49 ; totipo- 

 tence of isolated, 72, 76. 



Blastopore, 5, 14 ; closure of, 9 (fig.), 

 10 ; formed from animal cells, 71 ; 

 open in centrifuged eggs, 79 ; per- 

 sistence of, 80. 



Blastula : Echinoderm, 4. 



Blood-serum, 43. 



Boas, F., 22. 



Bombinator, optic vesicle of, 110. 



Born, G., 78. 



Boveri, T., 52. 



Brachet, A., 47, 72, 63. 



Brachystola, 94. 



Bullot, G., 40. 



Butyric acid, 39, 103 ; method of 

 causing artificial parthenogenesis, 

 39, 45. 



Calcium chloride, 94 ; effects of ab- 

 sence of, 49, 66. 



Calkins, G., 18. 



Cane-sugar, artificial parthenogene- 

 sis, 38. 



Carbon dioxide to induce artificial 

 parthenogenesis, 40, 109. 



Carmarina, 27, 



