654 
Correlation, between economic characters, 442 
between mothers and daughters, 457, 458 
classified, 55 
coefficient of, 52, 430, 458 
in plot yields, 430 
table, 49, 51 
interpretation of, 50, 52 
method of tallying, 50 
Correns, Bryonia alba, 212 
effects of crossing, 360 
Mirabilis, variegated, 273 
rediscovery of Mendel’s principles, 68 
starchiness in corn, 79 
somatic variation, 272 
Cotton, 317 
collecting stock seed, 341 
dimorphic branches and leaves, 275 
hybridization, 294 
leaf factor, 178, 179 
local adjustment of varieties, 441 
mass selection in, 292 
natural crossing in, 318 
pedigree breeding, 294 
plant-to-row tests, 433 
wilt-resistant selections, 417 
Coupling factor, 104, 126 
Cowpea, wilt immune variety, 416 
Crampton, grafted insects, 382 
Cratzegus-Mespilus graft-hybrids, 378, 379 
monogyna, 378 
Creating a gray breed of horses, 470 
new varieties, methods of, 302 
populations at Svaléf, 352 
rust-resistant wheat, 411 
Creation of bantam varieties of fowls, 500 
characters, 342 
disease-resistant plants, 400 
varieties of the rose, 310 
wilt-resistant watermelons, 414 
Cretinism, 526 
Crop plants, breeding begun, 288 
improved, 440, 441 
earlier breeders of, 289 
species and varieties, 302 
Cross-breeding for rust-resistant wheat, 411 
livestock, 514, 584 
Crossing, composite, 296 
effect on plant populations, 321 
immediate effect of, 360 
results of promiscuous, 343 
Crossing-over, 108, 109 
and non-disjunction, 202, 204 
and prepotency, 576 
between twelve sex-linked factors, 121, 123 
double, 119 
for white, miniature and bar in Drosophila, 
118-120 
in male Drosophila, no, 114, 209 
in male rat, 576 
in sex-heterozygote, no, 209 
in silk-worm, 210 
mode of interchange in, 121, 123 
percentage between loci, an indication of 
distance between factors, 117 
INDEX 
Crossing-over, triple, 121, 123 
Cross-over combinations of factors, 108, 119 
gametes, 119 
Cucumber, 317 
increased yield in Fi, 362 
Cuenot, multiple allelomorphism, 155 
Culley, inbreeding, 581 
Cumulative factors, 140 
Cuvier, fertility, 438 
Cydonia-Pyrus graft-hybrid, 378 
Cytisus Adami, 378, 382 
-Laburnum graft-hybrid, 378 
purpureus, 378 
Cytological investigations in insects, 210 
studies in @nothera, 285 
Cytology, method of, in genetic research, 8 
D 
Dahlia chimeras, 381 
species and varieties, 302 
Dairy cows, comparison of records, 455 
marvellous records of, 454 
obtaining records, 592 
Tilly Aleartra, 594, 597 
Daniel, stock and scion, 383, 384 
Daniel and Delpon, graft-hybrid, 378 
Daniel and Elder, stock and scion, 384 
Darbishire, dominance, 145 
pea crosses, 294 
Darwin, aberrant individuals, 276 
acquired characters, 6, 480 
adaptation, 438, 439 
Ancon sheep, 462 
“‘Animals and Plants under Domestication,’ 
276, 453 
cattle, 471 
dimorphism, 275 
evolution theory, 5 
fertility, 552 
hyacinth, 287 
mule, 517 
natural selection, 14, 276 
on Shirreff (cereals), 289 
“Origin of Species,’’ 276, 437 
plant improvement, 287 
quagga, 556 
reversion in pigeons, 171 
selection, 250 
sexual selection, 215 
theory of pangens, 489 
use and disuse, 491 
variations transmitted, 6 
variety crosses, 231 
vigor, 553 
zebra-ass hybrid, 520 
Darwinian theory of evolution, 439 
fertility, 552 
selection, 495 
Date palm, 318 
artificial pollination, 287 
Dates, research on, 300 
Datura, 438 
vigor in species hybrids, 230 
Digitized by Microsoft® 
, 
