INDEX 



667 



Scilla, 403, 437 

 Scolopendra, 103 

 Scolopendrium , 436, 448 

 Secale, fragment, 144, 147, 528 



interchange, 71, 147, 160 



interference, 293 



inv^ersions, 2J4, 279 



semi-precocity, 400, 407 



trisomic, jig 

 second division, of meiosis, 89, 119 

 secondary balance, see balance. 

 SECONDARY PAIRING, see 



pairing. 

 SECONDARY POLYPLOID, see 



polyploid. 

 Sedum, 36 y 

 seed mutations, 421 

 SEGMENT, see interstitial pairing, 



differential, interchange, 

 segmental interchange, see 



interchange, 

 segmentation, see cleavage. 

 SEGREGATION, 135, 245 et sqq. 



in allotetraploids, 186 



in autotetraploids, 186 



chromatid, 285 



in complex heterozygotes, 336 et 

 sqq. 



and mutation, 339 



secondary, 205, 225 



and sex determination, 336 



without reduction, 296 

 Seller, 359 



semi-permeable membrane, 19 

 SET, see chromosome, 

 seta, 38 

 Setcreasia, iii 



sex, determination of, 249, 335, 356 

 et sqq., 383 et sqq. 

 haplo-diploid, 376 

 SEX CHROMOSOME, 141, 356 et 

 sqq., X, XI 



differential affinity, 199 



inert parts, 330 et sqq. 



loss at mitosis, 68 



mitosis, 53 



precocity, 308 et sqq. 



in salivary glands, 177 



unpaired, 373 



Y chromosome, 330, 356 et sqq., 

 478 

 sex linkage, 356 

 partial, 372 

 SEXUAL DIFFERENTIATION, 14 

 , and polyploidy, 67 



sexual reproduction, see 



reproduction. 

 Sharp, 9, 578 

 Silene, 227 

 Simuleum, iy8 

 Smerinihus, 400 

 Solatium, basic number, 241 



pollen grains, 195 

 Solanum Ly coper si cum, chiasmata, 

 III 



fragments, 143, 148, 330 



haploid, 417 



polyploid, 121 et sqq. 



progeny of triploids, 320 



somatic doubling, 64 



tetraploid, 183 



trabants, 37 



trisomic. Jig, 321 

 Solanum nigrum, haploid, 195, 201, 

 442 et sqq. 



tetraploid, 185 

 Solenobia, 450, 467, 46g, 470 

 somatic doubling, 63 et sqq., J^/, 235 

 SOMATIC PAIRING, see pairing. 

 Sorghum, 404 

 Spartina, 234 

 species, 79 



chromosome numbers, 229 et sqq. 



clonal, 218, 227 



of known origin, 234 



polyploid, 197 et sqq., 220 



polyploidy within, 226 

 specificity, see attraction, 



differentiation, 

 spermatid, 396, 410 

 spermatozoid, 7, 449, 533 

 SPERMATOZOON, 9 et sqq. 



non-functional, 382 

 Sphcsrocarpus, 15 



cell size, 55 



intersexes, 387 



sex chromosomes, 308, 331, 357 



triploid, 216 



trisomic, 69 

 Sphcsromyxa, S2, 83 

 Spilosoma, 78 

 Spinacia, 115, 235, 390 

 SPINDLE, bent, 413, 530 



central, 28, 542 



centromere, 531 



in Coccidae, 380, 543 



failure of, 405, 408 et sqq. 



hollow, 397, 525 



intra-nuclear, 47 



at mitosis, 23, 25 



