INDEX 



8ii 



of, 121 ; differential dye reduction in, 124; 

 early cleavage of, 548; polar plasms of, 

 550, 557; embryonic reconstitution in, 

 556; centrifuged eggs of, 585 

 Tubularia: reconstitution in, 36; respiratory 

 gradient in, 60; dominance and physiologi- 

 cal isolation in, 314; so-called "axial 

 heteromorphosis" in, 315; blocking of 

 dominance in, 320; apical independence in 

 reconstitution of, ^t,7,\ scale of organiza- 

 tion in, 344, 357; new patterns in reconsti- 

 tution of, 359; oxygen and reconstitution 

 of, 413; pattern and electric current in, 421 



Valonia: pattern of cell wall in, 631; polarity 

 of, 632 



Vegetalization, in echinoderm development, 

 243 



Ventrodorsality: in planarian reconstitution, 

 44; of echinoderm embryos, 134, 137; of 

 Drosophila egg, 145, 671, 677; experi- 

 mental obliteration of, 201, 208, 215, 

 216, 225, 228, 231; in embryonic reconsti- 

 tution, 375, 377, 512; in centrifuged 

 eggs, 427, 585; spiral cleavage and, 

 554, 562, 585; Ascaris cleavage and, 571; 

 entomostracan cleavage and, 574; ascidian 

 cleavage and, 577; in animal eggs in gen- 

 eral, 657, 679; embryonic, in general, 672; 

 of Cerianthus, 675; origin and nature of, 

 675, 677. See also Dorsiventrality; Sym- 

 metry 



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