Index 



chromosomes in progeny of, 383; 

 polyploid plants from, 384; prog- 

 eny of, 386, 387, 381); chromo- 

 some alteration in, 393; and 

 species formation, 394 ; of value 

 in genetics, and in plant breed- 

 ing, 394. 

 Triploidy, an important phenomenon, 

 378; biological importance of, 

 389; and origin of species, 390, 

 394; stimulates interspecific cross- 

 ability, 391 ; and amphidiploidy, 

 391 ; and biological behavior, 393 ; 

 origin of, in Crepis. 394; and 

 migration of species, 394. 



Triplody in Crepis. Studies on Poly- 

 ploidy. I. Cytological Investi- 

 gations on, 377-400. 



Trisomie types in Crepis capillaris, 

 381, 394. 



Trisomies: distinguished from diploid 

 and triploid plants, 382; failure 



of, to appear in expected propor- 

 tions, 38G; value of, in genetic 

 analysis, 391; frequency of dif- 

 ferent types of, 392; absence of 

 secondary, in Crepis, 392. 



Tschermak, Von, genetic work on Mat- 

 thiola hybrids, 84. 



Vernonia mussurica, 220. 



Vicia, 366, 372 ; chromosomes in spiral 

 structure of, 409. 



Viola, 374; fixatives for staining, 

 403; conjugation of chromosomes 

 in hybrids of, 417. 



Wexelscn, Haakon, 355-76. 



Winge, O., on chromosomal chimeras 

 in Tragopogon, 344; on "crown 

 galls" on sugar beets, 347. 



Zygophase in Crepis, 406. 



"Zygotaxis," 82. 



[438] 



