656 



INDEX 



Duck, effect* of castration in, 550 



Rouen, 548 



secondary sexual characters, 548 

 Duplicate factors, 136 

 Dwarf beans, 175, 177 



maize. 174 



rootatocks, 383 



sweet peas, 175 



I 



Ear-to-row method, danger of, 334 



in maize, 327 

 East, bud selection, 394, 395 



corn breeding, 356 



genotypes in maize, 326 



germinal variations, 369 



inbreeding in maize, 325 



increased yield from hybrids, 353 



maize, 292, 293,. 295 



multiple factor theory of size inheritance, 

 185, 194 



Nicotiana hybrids, 228 



regression away from mean, 56 



tobacco, corolla length, 181, 182, 183 

 East and Hayes, flint X sweet corn crosses, 83, 84 



heterozygosis, 231 



inbreeding in maize, 325, 353 



inheritance in corn, 101 



Nicotiana crosses, 232 



segregation of starchy and sweet endo- 

 sperm, 79 



somatic variation, 272 



tobacco mutation, 177 



vigor in Fi hybrids, 326, 354, 355 

 Ecological variations, 18 

 Economy of time in breeding maize, 356 

 Ectogenetic variations, 20 

 Education, service of genetics in, 450 

 Effect of castration in animals, 548 



of selection in maize, 333 

 in pure lines, 257 



of self-fertilization, 256 

 Egg plant, graftage of, 374 

 on tomato, effect, 383 



production in fowl, and mass selection, 457, 



498 



and pigmentation, 506 

 fecundity, 497 

 mean monthly, 505 

 sex-linked factor for, 209 

 winter, 456, 506, 559 

 Elceagnus pungens, 18 



Elderberry, Variegated Black, chimeras in, 381 

 Elderton, goodness of fit, 102 

 Elliot, Lamarck's laws. 482 

 Elm, Fi hybrids in, 365 



Huntingdon, an Fi hybrid, 365 

 Emerson, beans, 175 



multiple allelomorphs, 160 



regression away from mean, 56 



somatic variation, 272 



test of hybrid gametes, 159 

 Emerson and East, ear-to-row selection, 356 



Endosperm texture, inheritance in maize, 84, 1O5 

 Endothia parasitica, 406 

 Englehart, oranges and lemons, 391 

 Environment and egg-production, 457 



and plant diseases, 400 



and mutations, 370 



conditions development, 25 



may cause new characters, 26 



modifies development, 21 

 Eosin eye color in Drosophila, 156, 192 

 Equipment of animal breeder, 450 

 Equus caballus X asinus, 228, 516 



hybrids, 468, 520, 557, 567, 570 



sterility of, 557 

 Erica, species hybridized, 438 

 Erikson, rust resistance, 412 

 Erisyphe graminis, 412, 413 

 Errors, accidental, 429 



experimental, 429 



probable, 45, 47, 430 



residual, 429 



Eucalyptus globulus, dimorphic leaves, 275 

 Eugenics, 11 

 Euonymus, 381 

 Evans, apple breeding, 295 

 Evans, H. M., chromosomes in man, 538 

 Evolution and mutations, 276 



and natural selection, 276, 439 



"dynamic," 483 



no longer questioned, 480 



role of factor mutations, 286 

 Ewart, domestic animals, 460 



quagga, 566 



telegony, 567, 568, 571 



zebra hybrid, 468 

 Exceptional offspring, non-disjunction, 199, 200, 



201, 202, 203 

 Experimental breeding, method of, 6 



cytology, method of, 9 



errors, in variety testing, 429 

 in reduction of, 431 



morphology, method of, 10 



results, factors affecting, 433 

 Extracted dominant or recessive, 73 

 Eye color in Drosophila, 194, 215 



F 



Factor, behavior predictable in Prosophila, 117 

 complex in a breed, 478 



and hybrid vigor, 559 



and prepotency, 575 

 conception of heredity, 110 

 constancy, belief in, 193, 194 

 contamination, assumed by Castle, 189 

 cotton leaf, 179 

 coupling and repulsion, 126 

 differences causing decreased vigor, 233, 554 



causing size differences, 194 

 explanation of reversion, 170 

 expression, variability in, 134 

 for variegation, 273 

 interactions, types of, 163 



