446 Subject Index 



Chemotherapy of cancer; see Cancer 



chemotherapy 

 Cheyenne, Wyoming, 311 

 Chiasmata reduced 



crossing o\er, 113 



frecjiiency decrease, 113 



terminalized, 113 

 Chiasmatal frequencies, 386 

 Chick egg, malformations of, 206, 209 

 Chilomoiias, 216 

 Chimaphila nianilata 



extracts of, 113 



influence on mitosis, 413 

 Chimera, 350, 356, 384 



induced bv colchicine, 348 



periclinal,'350, 356, 385 



reproduction of tetraploids, 350 



sectorial, 351, 385 

 Chinese \vheat, 358 

 Chlainydoinouas, 126 

 Chloracetophenone, 412 

 Chloral hydrate, 392 

 Chloralose anesthesia, 183 

 Chlorethone, 402 

 Chloroform, 373, 398 

 Chorionic gonadotropic hormone, 217. 



218, 226 

 Chortoplioga I'iridifasiata. 90. 377 



embryos, 377 



neuroblast cells, 66, 71-73 

 Chromatin bridges, 203 

 Chromatographic analysis, 153, 159 

 Chromatophores, 191 

 Chroniodoris sp., 88 

 Chromosomal breakages, 414 

 Chromosomal class, 355 

 Chromosomal orientation, ecjuatorial, 77 



in Arbacia. 11 



m Allium, 25, 79, 85, 96 



destroyed by colchicine, 37, 43, 44 



mechanism blocked, 65 



neuroblasts, 66, 70 



pollen tulje, 37, 108 



in Triticuin, 95 

 Chromosomal pairing 



diploid level, 281 



measure of fertility, 28! 



measure of homolog\. 281 



polyploid leyel, 281 



value of, 281 

 Clnomosome; see also Spiral coiling 

 of chromosomes 



aberrations, 54 



acetocarmine methods for, 19, 386 



agglutination, 52 



ball metaphase individuaUtv, 52 



birefringence of, 75 



breakages, 268 



iM-idges, 203 



c-pairs, 45, 85 



carbon tetrachloride poisoning, 52 



chimeras, 356 



clumped, 240, 379 



colchicine-treated, 47 



Cold Spring Harbor studies, 19 



contraction autonomous, 46-50 



cruciform type, 47-50 



destruction. 53 



desynchronization of, 51 



distribution in triploid meiosis, 329 



distributions, 86 



doubling of, 278 



duplications, 37 



e\olution of, 46-50 



extra, 345-47 



fibers of, 77 



fragmentation, 416 



fusion of. 52. 256 



independent of c-mitosis, 46 



intactness period, 46 



lagging, 83, 346 



lost, 40, 83 



mammalian cells, 47 



meiosis, 1 1 1-15 



meiotic contraction. 113 



metaphase, 37 



micronuclei in mice liver cells, 237 



nucleus and, 24 



niunber of. in Colchicuin species, 9-10 



ninnbers increase, 25 



optimal luunbers of, 283 



pairs of "skis," 49-51 



phlox. 364 



plants doubled number, 25-27 



poison, 392 



pollen tube. 108 



polyploidy induced, 20, 274-75 



precocious reversion, 47, 49, 73 



prophase, 31-5 



prophase arrangement, 35-42 



pseudospindle, 79 



pycnosis, 68 



rearrangements, 268 



reiteration of c-mitosis and numbers 



of, 55-56 

 relational coiling;, 47-50 

 repulse each other, 41 

 restitution nuclei, 17-59 

 reversions, 108 

 scattered, 40—11 

 seedless fruits and, 329 

 sex determination. 352-51 

 star formations, 39, 40, 41, 43 

 stickiness, 47 

 structure altered, 52-55 

 studies of, 386 

 tetraploid numbers, 52 

 tetrasomics, 354 

 transfer of, 286 

 transformation of, 30-31 

 transmission of, 386 

 transverse division, 53 

 trisomic pairing to measine homology, 



281 



