SKIN. 



INDEX. 



SPENCER. 



485 



Skln^, and its appendages, homologous, 

 ii. 317 ; hereditary atiections of the, 

 ii. 55. 



Skirving, R. S., on pigeons settling on 

 trees in Egypt, i. 190. 



Skull, characters of the, in breeds of 

 dogs, i. 35 ; in breeds of pigs, i. 74 ; 

 in rabbits, i. 121-126,135; in breeds 

 of pigeons, i. 172, 173; in breeds of 

 fowls, i. 273-279; in ducks, i. 296, 

 297. 



Skull and horns, correlation of the, ii. 

 327. 



Skylark, ii. 137, 



Sleeman, on the cheetah, ii. 133. 



Sloe, i. 366. 



Small-pox, ii. 372. 



Smiter (pigeon), i. 164. 



Smith, Sir A., on Caffrarian cattle, i. 

 91 ; on the use of numerous plants 

 as food in South Africa, i. 325. 



Smith, Colonel Hamilton, on the odour 

 of the jackal, i. 31; on the origin of 

 the dog, i. 16 ; wild dogs in St. 

 Domingo, i. 28 ; on the Thibet mas- 

 titi and the alco, i. 29 ; development 

 of the fifth toe in the hind feet of 

 mastiffs, i. 37 ; difl'erences in the 

 skull of dogs, i. 35 ; history of the 

 pointer, i. 44; on the ears of the 

 dog, ii. 291 ; on the breeds of horses, 

 1. 51 ; origin of the horse, i. 53 ; 

 dappling of horses, i. 58 ; striped 

 horses in Spain, i. 61; original colour 

 of the horse, i. 63 ; on horses scraping 

 away snow, i. 56 ; on Asinus hemionus, 

 ii. 17 ; feral pigs of Jamaica, i. 80, 

 81. 



Smith, Sir J. E., production of necta- 

 rines and peaches by the same tree, 

 i. 361 ; on Viola amoena, i. 392 ; 

 sterility of Vinca minor in England, 

 ii. 154. 



Smith, J., development of the ovary in 

 Bonatea speciosa by irritation of the 

 stigma, i. 434. 



Smith, N. H., influence of the bull 

 *' Favourite" on the breed of Short- 

 horn cattle, ii. 40. 



Smith, W., on the intercrossing of 

 strawberries, i. 372. 



Snake- rat, ii. 64, 65. 



Snakes, form of the viscera in, ii. 336. 



Snapdragon, bud-variation in, i. 407 ; 



non-inheritance of colour in, i. 464 ; 

 peloric, crossed with the normal 

 form, ii. 46, 71; asymmetrical 

 variation of the, ii. 314. 



Soil, adaptation of plums to, i. 368; 

 influence of, on the zones of pelar- 

 goniums, i. 390; on roses, i. 391 ; on 

 the variegation of leaves, i. 409 ; ad- 

 vantages of change of, ii. 127-130. 



Soil and climate, eii'ects of, on straw- 

 berries, i. 375. 



Solanum, non-intercrossing of species of, 

 ii. 68. 



Solanum tuberosum, i. 350, 351, 410. 



Solid-hoofed pigs, i. 78. 



Solomon, his stud of horses, i. 57. 



Somerville, Lord, on the fleece of 

 Merino sheep, i. 103; on crossing 

 sheep, ii. 99 ; on selection of sheep, 

 ii. 179 ; diminished fertility of Merino 

 sheep brought from S^iain, ii. 14 5. 



Sooty fowls, i. 242, 269. 



Sorghum, i. 396. 



Soto, Ferdinand de, on the cultivation 

 of native plants in Florida, i. 329. 



Spain, hawthorn monogynous in, i. 387. 



Spallanzani, on feral rabbits in Li- 

 pari, i. 118; experiments on sala- 

 manders, ii. 283, 357, 358 ; experi- 

 ments in feeding a pigeon with meat, 

 ii. 294. 



Spaniels, in India, i. 39 ; King Charles's, 

 i. 43 ; degeneration of, caused by in- 

 terbreeding, ii. 100. 



Spanish fowls, i. 237, 263, 268; figured, 

 1. 238; early development of sexual 

 characters in, i. 263 ; furculum of, 

 figured, i. 281. 



Species, difficulty of distinguishing 

 from varieties, i. 4 ; conversion of 

 varieties into, i. 5 ; origin of, by 

 natural selection, ii. 410; by mutual 

 sterility of varieties, ii. 169-172. 



Spencer, Lord, on selection in breeding, 

 ii. 179. 



Spencer, Herbert, on the " survival of 

 the fittest,' i. 6 ; increase of fertility 

 by domestication, ii. 89 ; on life, ii. 

 130, 161 ; changes produced by ex- 

 ternal conditions, ii. 270; effects of 

 use on organs, ii. 286 ; ascent of the 

 sap in trees, ihid. ; correlation ex- 

 emplified in the Irish oik, ii. 327, 328 ; 

 on "physiological i nits," ii. 370; 



