670 
Riddle, sex control, 545 
Ridgway, color standards, 271 
Riley, telegony, 564 
Rimpau, broad breeding, ¢ 
hybridization, 294 
Schlanstedt rye, 292 
Ritzman, sheep, 463 
Roberts, turkey wheat, 336 
immediate effects of crossing, 360 
Rogers, grape hybridizer, 290 
Roguing, practical value of, 418 
Role of, factor mutations in evolution, 286 
selection in breeding, 333 
Rommel, telegony, 568, 569, 570 
zebra hybrids, 520, 569 
Root crops, species and varieties, 302 
Rorig, species hybrids, 228 
Rosa, see Rose. 
Rosanoff, hereditary taints, 526 
Rose, creation of varieties, 310 
hybridization by Romans, 287 
My Maryland, 398 
species and varieties, 302, 310 
Roses, bud selection in, 398 
sports in, 398 
hybrid, 311 
Hybrid Bourbons, 311 
Hybrid Chinese, 311 
Hybrid Perpetual, 311 
Hybrid Tea, 311 
Roux, chromatin forms, 115 
Rubber tree, dimorphic branches, 275 
Rubus, species hybrids, 297 
Rudimentary wings in Drosophila, 554 
von Riimker, inbreeding rye, 319 
Running out of varieties, 340 
Rust, biologic forms of, 412 
-resistant asparagus, 415 
wheat, creating, 411 
Rye, 317, 319 
crossed with wheat, 229, 236 
eight chromosomes, 238 
line selection, 293 
remnant system, 335 
reputed self-sterility, 319 
ww 
35 
Ss 
Sageret, species hybrids, 230 
Salmon, Erysiphe, 413 
Salsify, first hybridized, 438 
Salt bushes, Australian, 401 
grass, 401 
Sambucus glauca, 17 
nigra variegata, 381 
Sanborn, increased yield from hybrids, 354 
Saturation, 571 
Saunders, A. P., Marquis wheat, 294 
INDEX 
Scion and stock, reciprocal effects, 382, 383 
Scrophularia, 27 
Scrub cows, records of, 455 
Search for mutations, 370, 464 
Secondary, non-disjunction, 200 
sexual characters, 214, 548 
Sectorial chimera, 375, 376, 380 
Sedum spectabile, 21 
Seed, corn, centralized production, 361 
hybrid, 361 
impurity of commercial, 428 
introduction, 299 
selection, value of, 335 
Seedage, methods of, 419 
\ Segregation, 57, 64, 67, 81, 94, 108, 188, 453, 515 
discovered by Naudin, 439 
evidence of, in quantitative inheritance, 181 
in species hybrids, 220, 224 
mechanism, 61, 274 
of size factors, 184 
somatic, a misleading term, 275 
vs. vegetative mutation, 272, 274 
Selby and Houser, tobacco, 363 
Selection, 11, 250, 325 
Saunders, Miss, stocks, inheritance in, 166, 167 
Saunders, Wm., apples, 297 
cold resistant fruits, 408 
Scardafella inca, 24, 25 
Science and plant breeding, 437 
Scilla, 25 
and breeding methods, 500 
and correlation, 49, 506 
and variation, 325 
as a cause of variation, 454 
bud, 298, 385, 386, 391 
changes position of mean, 188 
clonal, 291, 298 
ear-to-row, 327, 334 
effect of, in pure lines, 254, 257, 339 
for disease resistance, 416 
genotypic, 262, 425, 496, 584 
guided by progeny tests, 498 
by registration rules, 496 
in creating varieties of plants, 302 
in maize breeding, 325, 333, 334 
in sweet peas, 309 
in wheat, 336 
indices, 334, 502 
individual plant, 340 
isolation view of, 502 
line, 291 
mass, 260, 291, 498 
natural and evolution, 5, 276, 286 
not creative, 502 A 
of disease-resistant strains, 417 
of phenotypes may not isolate genotypes, 261 
of profitable strains, 432 
phenotypic, 578 
plant-to-row method, 337 
plus and minus in hooded rats, 191 
problem in animal breeding, 495 
remnant system, 335 
results of, in hooded rats explained, 191, 192 
two views regarding, 495 
value of seed, 335 
Self-fertilized plants, selection in, 336 
Self, colors, mutations, : 
populations of plants, 320 
273 
-fertilization, effects of, 256, 320 
Semon, “Mnemetheorie,’’ 483 
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