i76 



INDEX. 



polydactylism in. i. 459 ; cross-re- 

 version in, ii. S ; hybrid, vrildness 

 of, ii. 19; disappearance of tusks 

 in male tinder domestication, ii. 

 50 ; solid-hoofed, ii. 424 : crosses of, 

 ii. 70, 73 ; mutual fertility of all 

 varieties of. ii. 89 ; increased fertility 

 by domestication, ii. 90 ; il! effects of 

 close interbreeding in, ii. 100, 101 ; 

 influence of selection on, ii. 182 ; 

 prejudice against certain colours in, 

 ii. 194, 214, 380 ; unconscious selec- 

 tion of. ii. 199 ; black Virginian, ii. 

 212, 330; similarity of the best 

 breeds of. ii. 227 : change of form in, 

 ii. 269 ; effects of disuse of parts in, 

 ii. 289 ; ears of, ii. 291 ; correlations 

 in. ii. 320 ; white buck-wheat in- 

 jurious to, ii. 331; tail of. grafted 

 upon the back, ii. 365 ; extinction of 

 the older races of, ii. 421. 



Pliiexta, ii. G8. 



Pimpernel, ii. 173. 



Pine-apple, sterility and variability 

 of the. ii. 256. 



Pine, Chinese, 314. 



Pines, bud-variation in, i. 406 ; im- 

 provement of, ii. 201. 



Pinus pumUio, mughus, and nana, varie- 

 ties of P. sylvestris, i. 387. 



Pinus syivestris, i. 38ii, ii. 300; 

 hybrids of, with P. nitric ins, ii. 

 111. 



PiORRY, on hereditary disease, i. 451, 

 ii. 54. 



Pistacia lenti cu>, ii. 264-. 



Pistacia vera, i. 431. 



Pistils, rudimentary, in cultivated 

 plants, ii. 307. 



Pistor. sterility of some mongrel 

 pigeons, i. 202; fertility of pigeons, 

 ii. 91. 



Pisvm arvense an 1 sativum, i. 345. 



Pityriasis versicolor, inheritance of, 

 ii. 55. 



Planchox, G.. on a fossil vine. i. 352 ; 

 sterility of Jussicea grandifiura in 

 France, ii. 154. 



Plans-tree, variety of the. i. 386. 



Plantigrade carnivora, general ste- 

 rility of the, in captivity, ii. 134. 



Plants, progress of cultivation of, i. 

 322, 329; cultivated, their geogra- 

 phical derivation, i. 328 ; crossing 



of. ii. 76, 107 ; comparative fer- 

 tility of wild and cultivated, ii. 91 ; 

 self-impotent, ii. 112-122; dimor- 

 phic and trun orphic, ibid. ; sterility 

 of, from changed conditions, ii. 146- 

 149 ; from contabescence of anthers, 

 ii. 149. 150; from monstrosities, ii. 

 150, 151; from doubling of the 

 flowers, ii. 151, 152 ; from seedless 

 "fruit, ii. 152 ; from exce*sive de- 

 velopment of vegetative organs, ii. 

 152-155 ; influence of selection on, 

 ii. 183—185 ; variation by selection, 

 in useful parts of. ii. 202-204 ; 

 variability of, ii. 223 ; variability of, 

 induced by crossing, ii. 252 ; direct 

 action of change of climate on, ii. 

 266 ; change of period of vegetation 

 in. ii. 295 ; varieties of. suitable to 

 different climates, ii. 296 ; correlated 

 variability of, ii. 323-325 ; antiquity 

 of races of, ii, 425. 



Plasticity, inheritance of. ii. 227. 



Plateau, F., on the vision of amphi 

 bious animals, ii. 208. 



Platessa flesus, ii. 28. 



Plato, notice of selection in breeding 

 dogs by, ii. 186. 



Plica polonica, ii. 265. 



Pliny, on the crossing of shepherd 

 dogs with the wolf, i. 24 ; on Pyr- 

 rhus' breed of cattle, ii. 186 ; on the 

 estimation of pigeons among the 

 Romans, i. 215; pears described by, 

 ii. 200. 



Plum, i. 366-368 ; stones figured, i. 

 366 ; varieties of the, i. 367, 368 ; ii. 

 204; bud-variation in the, i. 399; 

 peculiar disease of the, ii. 213; 

 flower-buds of, destroyed by bull- 

 finches, ii. 217 ; purple-fruited, liable 

 to certain diseases, ii. 330. 



Plitmage, inherited peculiarities of, in 

 pigeons, i. 169,170; sexual pecu- 

 liarities of, in fowls, i. 263-268. 



Plurality of races, Pouehet's views 

 on, i. 2. 



Poa, seeds of, used as food, i. 326 ; 

 species of, propagated bv bulblets, ii. 

 154. 



Podolian cattle, i. 84. 



Pointers, modification of, i. 44 ; 

 crossed with the foxhound, ii. 73. 



Pois sans parchemin, ii. 216. 



