6^6 



INDEX 



Crepis tectorum — [contd.). 



ring chromosomes, 73 



tetraploid, 222 



trisomic, 69 

 Crocus, y6, 82, 160, XII 



chromosome numbers, 231 et sqq. 



polyploidy, 228 

 CROSSING-OVER, 87, 245 et sqq., 

 250 



with apomixis, 477 



complementary, 255 



dyscentric, 268 et sqq. 



four-strand, 285 



frequency, 281 



illegitimate, 275 



inference, 249, 298 



and internal spirals, 488 



map, 180, 283, 293 et sqq. 



mechanism, 547 et sqq. 



non-homologous, 494 



reciprocal, 255, 370 



in sex chromosomes, 359, 389 et 

 sqq. 



somatic, 553 



suppression, 333, 337 



theory of, see theory. 



unit, 333 



and X-rays, 553 

 Cruciferae, 306 

 Cryptobranchus , 45 

 Cryptomonas, 48 

 crystal, liquid, 522, 546 

 Culex, no, 376 

 Cutleria, 442 

 Cyanophyceae, 2 

 Cyanoiis, 80 

 Cycads, 533 

 Cycas, 115 

 Cyclops, 45, 522 

 Cydonia, VIII 

 Cynips, 450 

 Cyperaceae, 7 

 Cypris, 450 

 CYTOPLASM, 2, 193, 520 



Dactylis, 125 

 Dahlia, 235, VIII 



secondary pairing, 238 



polyploidy, 239 et sqq., 326 

 Daphnia, 436, 46g 

 Dark, 92, 96, 403 

 Dasychira, 78, 82 

 Dasyuyus, g4 

 Datura, ameiosis, 399 et sqq. 



fragment, 144 



Datura — {contd.) . 



haploid, 416, 444, 447 



interchange, 150 et sqq. 



monosomic, 316 



old seed, 420 



pollen abortion, 321 



progeny of triploids, J20 



somatic doubling, 64 



tetraploid, 185, ig4 



trisomic, 61, 148, sig 

 DEFICIENCY, 59, 69, 431, 554 

 et sqq. 



heterozygote, 152, 161, 260 



inert, 330 

 Delaunay, 57 



DELETION, 181, 554 et sqq. 

 Delphinium, igi 

 Dendroccelum, 31, 256 

 Dermaptera, 367 



detachment (sex chromosomes), 370 

 DIAKINESIS, 87, loi, 508 

 Dianthus, 228 



chromosome size, 55, 84 



hybrids, 208 

 diatom, 49 

 Dicentra, 242 

 DICENTRIC CHROMATID, see 



chromatid. 

 DICENTRIC CHROMOSOME, see 



chromosome. 

 Dicranura, 140, 163 

 DIFFERENTIAL AFFINITY, see 



affinity, 

 differential condensation, 98, 282, 



307, 500 

 DIFFERENTIAL SEGMENT, 264, 

 390 



(Enothera, 338, 346, 347, 349 et 

 sqq. 



Pisum, 263 



sex chromosomes, 365 



Zea, 262 

 differentiation, 3 



between chromosome sets, 227 



qualitative, 197, 245, 316 et sqq. 



of sex chromosomes, 389 et sqq. 

 See also chromosome, 

 diffuse stage, 94 

 Digitalis, haploid, 201, 444 



hybrids, 172, 173, 185 et sqq., 208 

 Digitalis mertonensis , 185 

 Dinophilus, 15 

 dioecism, 18, 335 

 DIPLOCHROMOSOME, 427, 531, 



554 



