INDEX 



University of California Publications in Agricultural Sciences, A^olume 2. 



Titles of papers in boldface. 



Acknowledgments, 84, 198, 219, 279, 



316, 349, 356, 378, 402. 

 Aegilops-Triticum, hybrid, 348. 

 Allium, 366; heterotypic chromosomes 



in, 410. 

 Amphidiploidy and triploidy, 391. 

 Anasa tristis, polyploid cells in, 346. 

 Ascaris, spiral structure of chromo- 

 somes in, 409. 

 Babcock, E. B., 1-46, 47-70; and Col- 

 lins, J. L., 191-204; and Lesley, 

 M. M., 315-41; and Clausen, J., 

 401-32. 

 Balanced-factor hypothesis in Droso- 



pliila, 83. 

 Balanced genetic factors in Oenothera, 



157. 

 Cannabis satira, tetraploidy in, 347. 

 Cell fusion, in Crepis Bureniaua, 346. 

 Chiasmas: in Crepis, 407, 408, 410; in 



Lilium, 418. 

 Chimeras, chromosomal: in Crepis, 

 343; in tomato, 344; in Thalic- 

 trum and Tragopogon, 344. 

 Chimeras, Chromosomal, in Crepis, 



343-54. 

 Chromatic spiral in Crepis, 407. 

 Chromonena. See Chromatic spiral. 

 Chromosomal chimeras, in Crepis, 343 ; 

 in Thalictrum and Tragopogon, 

 344. 

 Chromosomal Chimeras in Crepis, 



343-54. 

 Chromosomal mechanism, Crepis a 

 favorable genus for study of, 410. 

 Chromosomal variation and new varie- 

 ties, 378. 

 Chromosome Number and Individu- 

 ality in the Genus Crepis. I. 

 A Comparative Study of the 

 Chromosome Number and Di- 

 mensions of Nineteen Species, 

 297-314; II. The Chromosomes 

 and Taxonomic Relationships, 

 315-41. 

 Chromosome Numbers and Morphol- 

 ogy in Trifolium, 355-76. 

 Chromosomes, The: alteration in, 393 ; 

 chiasmas in, 407, 410; complexes 

 of, 372-75 ; parallel complexes of, 

 variations in, 374; conjugation 

 of, 417; constrictions of, 368, 

 375; doubling of, theory for, 

 347; fragmentation in, 383, 393, 



and origin of species, 392, 393, 

 395; liomotypic daughter nuclei 

 of, 413; individuality of, 365- 

 69; lengths of, 405; methods of 

 fixing and staining, 405; mor- 

 phology of, 357, 369, 401; muta- 

 tion in, 82; non-disjunction of, 

 123-56; numbers of, 357-59, 375, 

 401; paired, in tetraploid cells in 

 Spinacia oleracea, 347; absence 

 of paired, in Nicotiana hybrids, 



417, in Geum and Tragopogon 

 hvbrids, 419; reduplication of, 

 123, 160; satellites of, 365, 366, 

 375, 411; shape of, in heterotypic 

 meta-anaphase, 409; size, varia- 

 tion of, within the genus, 358-63, 

 368, 375, within the species, 363- 

 64, Mendelian inheritance of, 

 364; spiral structure of, 407, 409, 



418. See also Allium; Ascaris; 

 Crepis; Fritillaria; Podophyllum; 

 Tomato; Tradescantia; Trifol- 

 ium; Triploids; Vicia; Viola. 



Classification of species, criteria of, 

 421; and meiosis in (Crepis) 

 hvbrids, 419-22. 



Clausen, J., and Babcock, E. B., 401- 

 32. 



Climate, effect of, upon origin of 

 polyploids, 390. 



Clover — Italian white, Ladino, wild 

 white, cytological and species- 

 crossing experiments, 356. See 

 alfio Trifolium. 



Collins, J. L., 191-204, 20.5-16, 249- 

 96. 



Conjugation of chromosomes : in Viola, 

 All; in Crepis hybrids, 417. 



Crepis: 366, 372; taxonomy and cytol- 

 ogy in, 317-32; Hoffman's key 

 to"sections of, 320; classification 

 of species of, 329, 421; chromo- 

 somal chimeras in, 343; occur- 

 rence of triploids in, 378; satel- 

 lite and nucleolus in, 379; prog- 

 eny of triploids in, 389; chromo- 

 some number and indi\'iduality 

 of, 401; smear method vs. sec- 

 tioning, 403; chiasmas and cross- 

 ing over in, 408; chromosomal 

 mechanism of, 410; physiological 

 diversity between related species 

 of, 421. See also Chromosomes; 

 Hybrids ; Triploids. 



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