INDEX 
Parental forms, recovery of in F2, 176, 180, 184, 
186, 242 
Partial linkage, 106 
sterility in hybrids, 235, 236, 238 
Pathogene, fire-blight, 407 
Pathogenic fungi and bacteria, 401 
Patten, apple breeding, 295 
resistant fruits, 408 
Pattern, face, in Hereford cattle, 454, 474, 534 
Pea, 317, 440 
Marrowfat, 290 
sweet, 303 
Peach-almond graft-hybrid, 378 
and almond, grafting, 383 
breeding, 297 
Pear breeding begun, 288, 295 
chimeras, 381 
Chinese resistant to fire-blight, 408 
discontinuous variation in Le Conte, 274 
fire-blight resistance, 407 
-quince graft-hybrid, 378 
resistant hybrids, 407, 411 
Pearl, aleoholized fowls, 493 
biometry, 6 
coefficient of inbreeding, 598 
of relationship, 601 
curve of inbreeding, 600 
directions for poultry breeding, 590 
egg production, 209, 456, 464, 578, 588, 589; 
607 
index, 593 
fecundity in fowls, 559, 560, 561, 562, 
574 
fowls, 476, 497, 499, 500 
genotypic selection, 585 
labeling system, 423, 424 
milk record, 455 
natural phenomena, causes of, 268 
potency, 575 
prepotency, 576 
problem of inheritance, 4 
Redfield’s theory, 483 
selection indices, 502, 503 
sex-ratio, 544 
statistical knowledge, 55 
Pearl and Bartlett, characters of the corn grain, 
333 
Pearl and Parshley, sex-ratio, 543, 544 
Pearl and Surface, bean and oat breeding, 318 
fowl, 209 
monthly egg production, 505, 506 
selection index numbers, 334, 504 
trap nest, 592 
winter egg production, 457 
Pearson, biometry, 5 
prepotency, 576 
saturation, 571 
tables for statisticians, 102 
variability index, 53 
Peas, at Svaléf, 293 
crossing in, 318 
Mendel’s investigations with, 77 
pure lines in, 340 
tall and dwarf crossed, 68, 174 
563, 
667 
Pedigree culture, 6, 419 
in cotton, 295 
methods, 419 
system of, 293 
method, in Coleus, 390 
breeding, 580 
“Pedigreed”’ nursery stock, 394 
5, 394 
Pedigrees, ancient, 444 
of fowls, 588, 589 
livestock, 596 
Pelargonium zonale, chimera, 379 
Pentstemon, vegetative vigor in species hybrids, 
230 
Peony collections, 299 
Performance records of fruits, 391 
Periclinal chimera, 375, 376, 380 
Petunia nyctaginiflora * P. pheenicea, 230 
Phaseolus vulgaris nana, 250 
Pheasant hybrids, 521, 558 
Phenotype, 72 
Phenotypes in dihybrid F2, 82 
Phenotypic ratio, in a cross involving a sex- 
linked lethal factor, 133 
in dihybrid, 82 
in F» with n pairs of factors, 98 
in Ff. of purple starchy * white waxy 
maize, 106 
in F. of purple wavy X white starchy 
maize, 108 
in Fz of yellow red 9 X gray white @ in 
Drosophila, 113 
in F2 of yellow white @ X gray red @ in 
Drosophila, 112 
in F3 of dihybrid, 85 
in monohybrid, 71 
in tetrahybrid, 94 
in trihybrid 93 
selection, 577 
in fowls, 498 
limitations of, 578, 579 
Phleum pratense, see Timothy. 
Phylloxera, ‘‘benignant”’ and ‘‘ malignant”’ races, 
405 
earyecaulis, 211 
resistance dominant, 408 
factors, 409 
nature of, 404 
vastatrix, 402 
Phylloxeran, grape, 402 
hickory, 211 
Phylogeny and chromosomes, 264 
of the chromosomes, 264 
Physiological, behavior of graft-hybrids, 382 
characters of corn grain, 333 
variations, 16, 18 
Phytomeres, modifications of, 385 
selected, 386 
Pierson, Boston fern, 312 
Pig, see Swine. 
Pigeons, reversion in, 171 
sex-determination in, 545 
sex-linked characters, 209, 539 
Pigmentation, and egg production in fowls, 506 
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