INDEX 



671 



Separate culture. 293 



Serum albumin, stercoisomeric for MM. 20fl 



Service, of genetics. 448, 450, 609 



time of and acx-ratio, 543 

 Sesqui-hybrid, 73 



oombi nations, 235. 237. 244. 248 

 Sex-chromosomes, 58 00. 1 6, 211, 540 

 -factors. 215 

 -hormones. 545, 550 

 in animals, 536 



-inheritance of, 05, 190, 204, 205, 211 

 potency of factors, 217 

 Sex-determination, and genotypio constitution, 



218 



in animals, 530 

 in honey bee, 211 

 in hickory phylloxeran, 211 

 in insects, 2 10 

 in man, 538 

 in mullein thripe, 211 

 metabolic theories of, 544 

 Sexes, numerical equality of, 07 

 Sex-inheritance, 65 

 in plants, 212 

 non-disjunction and, 204 

 WZ type of, 205 

 XY type of. 190 

 Sex-linked characters, 197. 208, 209, 538 



in a plant, 214 

 factors, 117 



in X-chromosomc, 190, 546 

 inheritance, 74 



lethal factors in Drosophila, 132 

 Sex-ratios, 196, 539 



causes of unusual, 542 

 inheritance of, 546 

 in man, 540 



Sexual characters, secondary, 214, 548 

 Sexuality in plants established, 437 

 Sham el, bud selection, 391 



maize, 292 



Sharp, apple breeding, 295 

 Shaw and Heller, horns in sheep, 549 

 Sheep, Ancon, 462 

 Corriedale, 584 

 crossbreeding, 515 

 diversity of ancestry, 460 

 Dorsett, 515, 549 

 effect of castration, 549 

 horns in, 214, 549 

 marking, 602 

 Mendelism in, 475 

 Merino, 515 

 mutations in, 462, 463 

 Rambouillet, 463 

 sex-determination in, 536 

 Shropshire, 463 

 Southdown, 463 

 sterility in, 552 

 Suffolk, 549 

 telegony, 564 

 Shin-err, cereals, 289 

 plant breeding, 437 

 selection, 366 



Rhull. A. I . mullein thrips. 211 

 Khull, G. 11.. acquired characters, 480 



Buna. 421 



corn breeding, 350 



factors multiple, 139 



genotypes in maize, 326, 830 



heterosis. 231, 353 



inbreeding in maise, 325 



increased yield from hybrids, 353 



Lychnis dioica, 213, 214, 215 



maize, 293, 295 



multiple allelomorphs in Lychnis, 150 



records, 422 



regression, 56 



variation, 309 

 Silkworm, larval pattern, 210 



linkage in, 125, 209 



multiple allelomorphs in, 158, 210 

 Size, a complex character, 194 



inheritance of, 174, 188 

 Skew polygons, 35 



Small grains, composite crossing of, 290 

 Smith, L. II , corn breeding experiments, 327, 329 



maise, 292 



Smith and Thomas, pheasants, 558 

 Smut fungus, immunity of milo, 416 

 Snapdragon, 440 



common, 90, 133 



dimorphic flowers, 275 



variegated, 381 

 Soil heterogeneity, correcting for, 431 



criterion of, 430 

 Solanum chimeras, 374, 375 



Darwinianum, 377 



dulcamara, 378 



Gartnerianum, 375, 377, 382 



Kolreuterianum, 375, 377, 382 



lyoopersicum, 375, 378 



melongena, 378 



nigrum, 375, 378 



proteus, 375, 377, 382 



tubigense, 375, 376, 382 

 Soma and germ-plasm, 2, 485, 490 

 Somatic cell division, 59 



modifications, 453 



mutations, 386 



segregation a misleading term, 275 

 M. vegetative mutation, 272, 274 



variations, 272 

 Somatogenesis, 2, 20 

 Somatogenic characters, 480 

 Sorghum, collecting stock seed, 341 



origin of varieties, 370 

 South worth, alfalfa, 297 

 Species, disease resistance in, 401 



factors in, 219 



homologous factors, 224 



hybridization, 219, 310, 312, 342 

 in domestic animals, 515 



hybrids, forms of, 227 



peculiar phenomena in, 249, 542 

 sterility in, 234 

 vigor of, 230 

 in CEnothera, 244, 280 



