Index 



Spiral structure of chromosomes : in 

 Ascaris, Fritillaria, Podophyllum, 

 Tradeseantia, and Vicia, 409 ; in 

 Cl-epis, 409, 418 ; in Lathyrus, 418. 



Staining, methods of. See Fixation. 



Statistical methods, for mutation in 

 Matthiola, 145-51. 



Sterility in Crepis hybrids, 418. 



Studies in Juglans. I. A Study of a 

 New Form of Juglans californica 

 Watson, 1-46; II. Further Obser- 

 vations of Juglans californica 

 Watson and on Certain Supposed 

 Walnut-Oak hybrids, 47-70; III. 

 (1) Further Evidence that the 

 Oak-like Walnut Originates by 

 Mutation. (2) A Parallel Muta- 

 tion in Juglans Hindsii (Jepson) 

 Sargent, 71-80. 



Studies on Polyploidy. I. Cytological 

 Investigations on Triploidy in 

 Crepis, 377-400. 



Taxononiic relations in Crepis species, 

 419. 



Tetrads and micronuclei in Crepis 

 aspera x C. bursifolia, 414. 



Tetraploid, area, shape of, 344; 

 chromosome number in "crown 

 galls" on sugar beets, ?A7 ; cells 

 in Spinacia oleracea, 347 ; shoots 

 in Datura, 346, 348; hybrid, be- 

 tween Nicotiana tabacum and N, 

 glutinosa, 348 ; Aegilops-Triticum 

 hvbrid of Tschermak and Bleier, 

 348. 



Tetraploidy, in Crepis Hakeli and C. 

 montana, 343; origin of, 346; 

 induced by narcotics, 346; in 

 Datura, 346; in Solanum, 346; 

 in dermatogen of root tips of 

 Cannabis sativa; in dermatogen 

 of Spinacia oleracea, 347. 



Thalictrum, chromosomal chimeras in, 

 344. 



Theories, to account for doubling of 



chromosomes, 347. 

 Tomato, chimeras in, 344; tetraploid 



areas in, 346 ; progeny of tri- 



ploids in, 389 ; fragmentation of 



chromosomes in, 393. 



Tradeseantia, spiral structure of 

 chromosomes in, 409. 



Tragopogon hybrids, complete pair- 

 ing of chromosomes in, 418.. 



Trifolium: 372; chromosome mor- 

 phology in, 357, 369; chromosome 

 numbers in, 357, 375 ; chromosome 

 size in, 359, 368, 375; chromo- 

 some satellites in, 365, 366, 367, 



375 ; chromosome constrictions in, 

 368, 375 ; attempts at species 

 crossing in, 370, 375 ; intraspecific 

 crosses in, 371; evolution of 

 chromosome complexes in, 372— 

 374 ; species differentiation in, 

 373 ; simple polyploid series in, 

 374. 



albopurpureum, 358, 360, 361. 

 alexandrinum, 355, 358, 361, 362, 



366, 367, 368, 369, 372. 

 ciliolatum, 358, 360, 361. 

 dichotomum, 358, 359, 360, 361. 



fueatum, 358, 360, 361, 366, 373. 

 var. vireseens, 358. 



glomeratum, 356, 358, 361, 362, 372, 

 374. 



hybridum, 3.55, 358, 361, 362, 366, 

 368, 369, 373, 374. 



incarnatum, 355, 358, 361, 362, 366, 



367, 368, 372. 

 majus, 360, 361. 

 medium, 370, 372. 

 microcephalum, 358, 360, 361. 

 minus, 358, 361, 362, 365, 369. 

 montanum, 359. 



obtusiflorum, 357, 360, 361, 363, 



372, 374. 



var. majus, 357. 

 pannonicum, 370. 

 pratense, 355, 356, 358, 361, 362, 



366, 367, 368, 369, 372, 374, 



375. 



reflexum, 358, 359, 360, 361, 363, 



368, 369. 



repens, 355, 356, 358, 363, 365, 369, 



373, 374, 375. 



var. giganteum, 356, 361, 363, 364. 

 var. sylvestre, 356, 361, 363, 364. 

 subterranum, 356, 358, 361, 362. 

 variegatum, 357, 359, 360, 361, 363, 



373. 

 vireseens, 360, 361, 366, 373. 

 wormskjoldii, 357, 360, 361, 373. 

 Triploid plant, compared with diploid, 

 380; progeny of, 381. 



Triploids: origin of, 383, 384; progeny 

 of, in Tomato, 389. See also 

 Datura and Oenothera. 



Ti-iploids in Crepis: 378, 381; somatic 

 chromosomes in, 379; cytogenetic 

 behavior of, 380-83 ; slow develop- 

 ment of, low fertility, and normal 

 mitosis in, 380; interspecific hy- 

 brids of, 382; fragmentation of 



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