INDEX 
Przibram, species hybrids, 228 
Psychological variations, 17 
Pucci, Gujarat bull, 531 
zebu cattle, 527 
Puccinia asparagi, 415 
biologic forms, 412 
glumarum, triticina, and graminis, 412 
rubigo-vera tritici, 416 
Pumpkin, 317 
Punnett,) checkerboard method, 98 
fowl, 209 
linkage in peas, 125 
theory of, 126 
multiple allelomorphs, 160 
presence and absence hypothesis, 153 
rabbit, 225 
Punnett and Bailey, fowls, 500 
Pure-bred livestock, per cent. of, 450 
sires recommended, 510 
Pure line, concept and maize, 293 
method invented, 291 
theory and breeding, 259 
lines, 8, 250 
conditions necessary for, 255 
defined, 255 
discovery of, 250 
effect of selection in, 253, 257, 339 
impossible in allogamous species, 256 
in oats, barley, peas, beans, 340 
in self-fertilized populations, 321, 336 
in wheat, 336 
isolation of, 256 
selection in oats, 371 
Pyrus, communis, sinensis, ovoidea, variolosa, 
betulifolia, 407 
-Cydonia graft-hybrid, 378 
Q 
Quantitative inheritance facts of explained, 192, 
194 
factor relations in, 174 
most common type of, 179 
multimodal curves in F2, 179, 181 
must be analyzed, 440 
Quince-pear graft-hybrid, 378 
R 
Rabbits, multiple allelomorphism in, 160, 225 
Race horses, ten greatest, 497 
Rapid growing trees, 365 
Rasmuson, phylloxera-resistance, 408 
Ratio of phenotypes, in dihybrid, 82 
in F, with n pairs of factors, 98 
in F’3 of dihybrid, 85 
in monohybrid, 71 
in tetrahybrid, 94 
in trihybrid, 93 
Ratios, forces tending to disturb Mendelian, 102 
methods of testing Mendelian, 100 
peculiar Mendelian, 132, 137, 139, 140, 141, 
142 
sex, 539, 542, 546 
standard deviation of Mendelian, 100 
669 
Rats, crossing-over in male, 576 
effects of castration in, 550 
hooded, 186, 187 
linkage in, 125 
sex-ratio in, 542, 547 
Ravaz, phylloxera-resistance, 405 
Reaction system, concept, applied, 575 
Goodspeed and Clausen, 242, 248 
Jesenko, 238 
hypothesis, 242, 248 
systems, in Gnothera hybrids, 286 
in species, 242 
Recessive allelomorphs, real factors, 155 
Recombination, 57, 73, 81, 185, 220, 224 
and animal breeding, 515 
and variation, 15, 99, 459 
gametes, 244, 249 
in Nicotiana, 242 
mechanics of, 460 
Recording data, 603 
methods of, 422 
system of, 423 
Red-eye color, in canaries, 209 
in Drosophila, 156, 192 
Redfield, dynamic evolution, 483 
Reduction division, 60, 67, 83, 91 
Reduplication theory of linkage, 126 
Registration requirements for trotting horses, 496 
Regression, 55 
during return selection in hooded rats, 188 
in pure lines, 252 
law of filial, 5 
straight line, 56 
Reichert, specificity of proteins, 266 
Reid, Miss, variegated forms, 382 
Reimer, blight, 407, 411 
Reitz, correlation, 458 
Reitz and Smith, effects of selection, 334 
probable error, 47 
Relation, of genetics and plant breeding, 440 
of science to plant breeding, 437 
of yield to feed cost, 446 
Relationship, coefficient of, 600 
Remnant system of maize breeding, 335 
Renner, Gnothera crosses, 247 
Gnothera, seed sterility in, 283 
Reproduction in plants, 317 
Repulsion factor, 126 
Requisites to reliability, 37 
to success in animal breeding, 451 
Research on plant groups, 300 
Resemblances between organisms, 1 
Residual errors, 425 
Reversion, factor explanation of, 170 
in fowls, 171 
in pigeons, 171 
Rhododendron, 438 
hybrid varieties, 311 
Rhubarb, heterosis in, 364 
Rice, 317 
ancient improvement, 287 
imperial Chinese, 287 
little natural crossing, 318 
water requirement, 402 
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