INDEX 



Przibram, species hybrid*, 228 

 Psychological variation*, 17 

 Pucci, Gujarat bull, 531 



zebu cattle, 527 

 Puccinia asparagi, 415 

 biologic forms, 412 



glumarum, triticina, and graminis, 412 

 rubigo-vcra tritici, 410 

 Pumpkin, 317 



Punnett, checkerboard method, 08 

 fowl, 209 

 linkage in peaa, 125 



theory of, 120 

 multiple allelomorph*, 100 

 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 maiie, 203 

 method invented, 201 

 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, 25fi 

 in oats, barley, peas, beans, 340 

 in self-fertilized populations, 321, 330 

 in wheat, 330 

 isolation of, 256 

 selection in oats, 371 

 Pyrus, communis, sinensis, ovoidea, varioloea, 



betulifolia, 407 

 -Cydonia graft-hybrid, 378 



Quantitative inheritance facts of explained, 192, 

 104 



factor relations in, 174 



most common type of, 170 



n ml l i in 01 1 id curves in Ft, 179, 181 



must be analyzed, 440 

 Quince-pear graft-hybrid, 378 



R 



Rabbits, multiple allelomorphism in, 100, 225 



Race horses, ten greatest, 407 



Rapid growing trees, 365 



Rasmuson, phylloxera-resistance, 408 



Ratio of phenotypes, in dihybrid, 82 



in /'. with n pairs of factors, 08 



in F i of dihybrid, 85 



in monohybrid, 71 



in tetrahybrid, 04 



in trihybrid, 03 

 Ratios, forces tending to disturb Mendelian, 102 



methods of testing Mendelian, 100 



peculiar Mendelian, 132, 137, 130, 140. 141, 

 142 



sex. 539. 542, 546 



standard deviation of Mendelian, 100 



HaU, crossing-over in male, 576 



effect* of castration in, 010 



hooded, 186, 187 



linkage in, 12A 



ex-ratio in, 642, 547 

 Havaz, phylloxera-rcaiitance, 405 

 Reaction system, concept, applied, 575 



Goodspced and Clausen, 242, 248 

 Jescnko, 238 

 hypothesis, 242, 248 

 systems, in (Enothera hybrids, 280 



in specie*, 242 



Recessive allelomorphs, real factors, 15& 

 Recombination, 57, 73, 81, 185, 220, 224 



and animal breeding, 515 



and variation, 15, 00, 450 



gametes, 244, 240 



in Nicotiana, 242 



mechanics of, 460 

 Recording data, 603 



methods of, 422 



system of. 423 

 Red-eye color, in canaries, 200 



in Drosophila, 156, 102 

 Redfield, dynamic evolution, 483 

 Reduction division, 60, 67, 83. 91 

 Reduplication theory of linkage, 126 

 Registration requirements for trotting horse*, 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, (Enothera crosses, 247 



CEnothera, 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 



