INDEX OF SUBJECTS 



Abnormality, 1 ; produced by cen- 

 trifugalizing, 88 ; by shocks, 89 ; 

 by perpetual rotation, 90 ; by 

 sound vibrations, 90 ; by electric 

 currents and magnetism, 91 ; by 

 heat and cold, 98 sqq. ; by desicca- 

 tion, 115 ; by sodium chloride and 

 other substances, 199 sqq., 132 ; 

 significance of for study of variation, 

 155, 156 ; produced by irregular 

 distribution of chromosomes, 263- 

 266. 



Absorption of water, see Water. 



Absorption, by cells, 5. 



Abstraction of water, see Water, 

 withdrawal of. 



Acanthocystis, 48. 



Acceleration of development by weak 

 electric currents, 91 ; in violet 

 light, 94, 95 ; at high tempera- 

 tures, 97, 105 ; in pure oxygen, 

 110 ; by pilocarpine, 151 ; by 

 sodium hydrate, 151. 



Acclimatization, 290 ; to heat, 100 ; 

 to hypertonic solutions, 117; to 

 salt, 136. 



Acids, 122. 



Acrosome, 123. 



Adaptation, 290. 



Aggregates of cells, 5 sqq. 



Aggregation of cells, 5. 



Agitation, mechanical, 89. 



Albumen, as a medium, 45, 53 ; drops 

 of, 54 ; of Hen's egg, 115. 



Alcohol, 132. 



Alcyonaria, 55. 



Alkalinity, need of, 150, 151. 



Alkaloids, in Amphibian eggs, 120, 

 123 ; on Sea-urchin eggs, 126 sqq. ; 

 on Hen's egg, 132. 



Allantois, fused with somatopleure, 

 9 ; sticks to yolk sac in eggs that 

 are not turned, 89. 



Allelomorphs, 266. 



Allolobophora, 251. 



Alteration of potentiality, see Potenti- 

 ality. 



Alteration in shape of cells, 5, 29, 48. 



Alternation in direction of division 

 in ' spiral ' cleavage, 25, 28. 



Amblystoma, absorption of water by 



tadpole, 58 ; effects of cold, 100 ; 

 effect of solutions, 120 ; acclima- 

 tized to salt, 136 ; formation of 

 lens, 275. 



American Periwinkles, 71. 

 Ammonia, on Hen's egg, 132 ; effect 



on nuclei, 135. 



Amnion, not formed at low tempera- 

 tures, 104 ; folds of, 9 ; abnormal, 

 110. 



Amniota, archenteron of, 8; oviduct 

 of, 9. 



Amoeboid processes in blastomeres, 

 53 ; movements of polar lobe, 227. 



Amphiaster, see Spindle. 



Amphibia, oviduct in, 9 ; absorption 

 of water by tadpoles, 58, 115; 

 influence of electric current on, 

 91; effect of various solutions on, 

 119-123, 133-135; effects of heat 

 and cold on, 97-101 ; acclimatized 

 to heat, 100 ; to salts, 136 ; isolated 

 blastomeres of, 159 sqq. 



Amphikaryotic, 267. 



Amphioxus, club-shaped gland, 6 ; 

 medullary plate, 8, 133 ; segmenta- 

 tion of, 22, 26, 28, 47 ; in certain 

 solutions, 140; potassium neces- 

 sary to adult, 1 47 ; isolated blasto- 

 meres of, 179,180; double embryos, 

 180. 



Amphitrite, segmentation of, 26 ; 

 parallel polar furrows, 46; artifi- 

 cial parthenogenesis, 124. 



Anachronism of first furrow in Frog, 

 161, 165. 



Analytical theory of Driesch, 280- 

 286. 



Anastomoses of cell-aggregates. 6, 

 273. 



Anencephaly, 119. 



Anenteria, 106. 



Angles between contact surfaces in 

 systems of lamellae, 43 ; in seg- 

 menting ova, 47, 53 ; between egg 

 axis and first furrow in forcibly 

 inverted Frog's eggs, 82 ; between 

 plane of symmetry, first furrow, 

 and sagittal plane, 165-167. 



Animal cells, see Cells. 



Animal pole, near anterior end of 



