452 Subject Index 



Fertility (cnnlinued) 

 seed set, 371 



triploid sterility, 371 

 Fertilizing agents, chemical, 275 

 Feulgen technique, 386 

 Feulgen-positi\e masses, in cytoplasm, 53 

 Fiber destruction, 77 

 Fibers, 140, 403 



chromosomal, 67, 77, 81 



continuous, 67, 77, 81, 83, 89 



suppressed continuous, 77 

 Fibroblasts. 91 

 Fibroblast cultures, 30, 407, 419 



of chick, 378 



of mammals, 378 



in tissue culture, 215, 378, 417 

 Filifoliae. 10 

 Fish, 375 



Flexner-Jol)liiig carcinoma of rat, 90 

 Flour, tetraploid rye, 368 

 Fluoroacetate, 181 

 Folic acid antagonists of. 247 

 Follicular cells; see 0\ary 

 Forage production in clo\'er. 358 

 Forage species, 288, 321 

 Forensic medicine, 176; see also Medicine 

 Formidaries, modern. 140 



pharmacy handbook, 141 

 Fragaria I'escti. 323 



autotetraploids, 323 



diploid, 323 



hexaploids. 323-24 



octoploids, 323 



polyploids of, 323-24 

 Fraoments, 97 

 Fritillaria, 115 



chiasmata and colchicine, 115 

 Frog 



colchicine dosage, 382 



deyelopment, disturbances of, 204 



heart of, 183 



oyary of, 192 



pattern of gro\\'th in, 210 



polyploidy in, 381-82 



sperm sirspcnsion, 382 



striated muscle of, 180-81 



tadpoles, 245 



temperature effects and colchicine, 

 194-95 



toxicity study, 194-95 

 Fruit 



of Colchiruiu, production in spring. 

 5, 6, 7 



of Cucurhita, 31 1 



grain weight in rye, 366 



improyement of, 331 



larger size of tetraploid, 363 



parthenocarpy in watermelon, 329 



pericarp extracts, 144, 146, 147. 154 



pollination by diploid. 367 



polyploidy, 323 



of Rihes, a new species, 312 



and seed, criteria of polyploidy, 363 



size correlated to polyploidy, 367 



triangidar. 365 



of watermelon, 327, 328, 330 

 Furrowing, in animals, 88 

 Fiisarium niveum, 370 



resistance to, in watermelon. 370 

 Fusions 



binucleate stage. 97 



trinucleate stage, 97 



Galen, 1 1 



Galeopsis, species of: bifida. 310; puhes- 

 ceus, 310; specinsa. 310; tetrahit, 310 

 Galeopsis tetrahit synthetic. 279 



amphiploids. 310 



interspecific hybrids. 310 



octoploid with more than optimal 

 niunber, 310 



synthetic Linnaean species, 310 



tetraploids, 310 

 Gametes 



adult spermatozoa. 206 



binucleated, 205 



c-meiosis, 112-15 



diameters of, 205 



diploid, 278 



female gametophytes, 118 



frog sperm suspension, 382 



male, 204-6 



in pollen tube, 37, 117, 118 



to produce triploids, 381-83 



sperm material, 59 

 Gametic doubling 



in nature, 294 



in Nicotiaua, 307 

 Gametophytes 



ferns, 119 



liyerwort, 117-20 



mosses, 1 1 7-20 



polyploids, 117 

 Gametophytic development, 103. 110-18 

 Ganglionic nerve cells, 210 

 Gastric mucosa. 376 

 Gastrulation. 203 

 Gelation-solation phases, 89 

 Genetic changes, 275 

 Genetic markers, 329 

 Genital tissues 



biopsy of, 376 



or hinuan \agina, 376 



of rodents, 376 

 Genome 



amphijiloid stability depends on gene 

 exchange iDCtween. 294 



classification by, 303 



D genome, 296 



Gossypium, 304 



hexaploids, 299 



incompatil)ilitv of, 293 



intergenomal pairing, 277, 293 



