672 



INDEX 



Species, peculiarities in hybridization, 342 



universal indicator, 234 



Specificity of proteins and carbohydrates, 260 

 Spencer, acquired characters, 0, 480 



germinal theory, 489 



on Darwin, 5 



Sperm, male and female producing, 190, 640 

 Spermatozoa, dimorphism in, 540 



in Equus hybrids, 520 

 Spillman, polled cattle, 463 



swim-, 476 

 Spindle. 60, 61, 64 

 Spindle Tree, chimeras in, 381 

 Bpireme, 59 

 Sports, bud, 270, 298 



in sweet peas, 304 



utilization of, 302 

 Spragg, alfalfa, 417 



barleys, 340 

 Sprengel, hybrids, 438 

 Squash, 317 

 Standard deviation, calculation and significance, 41 



diminished during selection, 188 



of a Mendelian ratio, 100 



of an Fj population, 184 

 Standardization of varieties, 432 

 Stapels-Brown, reversion in pigeons, 172 

 Starch grains, in round and wrinkled peas, 145 



Btereoisomeric forms of, 266 

 Stark man and Piemeisel, wheat rust, 412 

 State associations of breeders, 301 

 Statistical method, employment and value of, 56 

 Steinach, ovarian transplantation, 550 

 Stereoisomeric forms of organic substances, 266 

 Sterility of hybrids, 556 



in animals, 555 



in species hybrids, 227, 228, 234, 236, 238 

 Stewart, degeneration in potatoes, 397 

 St. Hilaire, fertility, 438 

 Stizolobium deeringianum, 367 

 Stockard, effect of alcohol on guinea-pigs, 30, 493 

 Stock and scion, reciprocal effects, 383 

 Stockberger, experimental error, 430 

 Stocks, see Matthiola. 

 von der Stok, intergeneric hybrids, 296 

 Stout, Coleus, 386, 387, 388, 389 

 Strain tests at Svaldf, 425 



test of tomatoes, 433 



tests, purposes, 432 

 Strains, disease resistant, 417 

 Strawberry, breeding in America, 289, 294 



bud selection in, 398 



heterosis in, 364 



hybridization, 311, 398 

 Strawberry Bush, see Spindle Tree. 

 Stuart, bud selection, 394, 395 



potato, 428 



tuber-unit, 396, 397 

 Sturtevant, crossing-over, factors that lower, 120, 



210 

 Sturtevant and Bridges, crossing-over, 113 



no crossing-over in the male, 1 14 

 Substitutional changes in factors, 267 

 Sugar beet, 317 



Sugar beat, improvement begun, 291 

 line selection, 340 

 mass selection, 292, 340 

 selection of mutations, 340, 370 



cane, heterosis in, 364 

 Sumner, acquired characters, 491 

 Sunflower, 317, 318 



chimeras, 381 



isolation of pure strains, 257 



red, 270 



self-sterile, 257 



Supernumerary legs in Drosophila, 136 

 Surface, corn selection, 329, 330, 333 



linkage in oats, 125 

 Surface and Barber, experimental error, 430 



oats, 429 



Surface and Pearl, soil heterogeneity, 431 

 Surface and Zinn, oats, 340, 371 



planting board, 339 



record blanks, 435 



variations, 369 

 Survival of the fittest, 5 

 Sutton, plant breeding, 437 



plant improvements, 290 

 Svalof, method, 352 



plant breeding station, 258, 293, 340 



system of breeding, 425 

 Swedish, plant breeding station, 258 



Seed Association, 293 

 Sweet pea, Blanche Ferry group, 309 



bush, 175, 308 



bush-Cupid, 176 



contabescence, 234 



collections, 299 



complementary factors, 140 

 Cupid, 175, 177, 308 



diversity of variety, 303 



double, 307 



early flowering, 309 



first recorded hybrid, 309 



flower color in, 394 

 form and size, 304 



habit in, 308 



history, 303, 304, 305 



hybridization and selection, 309 



linkage in, 125 



mutations in, 304 



novelty forms, 307 



origin of varieties, 303, 305 



snapdragon, 307 



species and varieties, 302 



tall and dwarf, 174, 175 



waved or Spencer, 306 

 Swine, chromosome number, 537 



Hampshire, 476 



Mendelism in, 476 



mule footed, 476 



sex-determination in, 536 



spermatozoa in, 540 



white dominant in, 579 

 Swingle, citrus, 297 

 Synapsis, 61, 67, 108, 115, 121, 123, 199, 201, 204, 



559 

 System, of aleurone color factors in maize, 163 



