462 
SCOLYTUS. 
INDEX. 
SEXUAL. 
Scoiyhis, stridulation of, i. 379. 
Scoter-duck, black, sexual difference 
in coloration of the, ii. 226; bright 
beak of male, ii. 227. 
Scott, J., on the colour of the beard 
in man, ii. 319. 
SCROPE, on the pugnacity of the male 
salmon, ii. 3 ; on the battles of 
stags, ii. 240. 
SCUDDER, S. H., imitation of the 
stridulation of the Orthoptera, i. 
353 ; on the stridulation of the 
Acridiidse, i. 356 ; on a Devonian 
insect, i. 360; on stridulation, ii. 
331. 
Sculpture, expression of the ideal of 
beauty by, ii. 350. 
Sea-ANEMONIES, bright colours of, i. 
322. 
Sea-bear, polygamous, i. 268. 
Sea-elephant, male, structure of 
the nose of the, ii. 278 ; polyga- 
mous, i. 268. 
Sea-lion, polygamous, i. 268. 
Seal, bladder-nose, ii. 278. 
Seals, their sentinels generally fe- 
males,!. 74; evidence furnished by, 
on classihcation, i. 190; sexual dif- 
ferences in the coloration of, ii. 
287; appreciation of music by, ii. 
333 ; battles of male, ii. 240 ; ca- 
nine teeth of male, ii. 241 ; poly- 
gamous habits of, i. 268 ; pairing 
of, ii. 269 ; sexual peculiarities of, ! 
ii. 277. I 
Sea-scorpion, sexual differences in, | 
ii. 9. 
Season, changes of colour in birds, in 
accordance with the, ii. 80 ; changes 
of plumage of birds in relation to, 
ii. 180. 
Seasons, inheritance at correspond- 
ing, i. 282. 
Sebituani, ii. 340. 
Sebright Bantam, i. 294. 
Secondary sexual characters, i. 253 ; 
relations of polygamy to, i. 266 ; 
gradation of, in birds, ii. 135 ; 
transmitted through both sexes, i. 
279. 
Sedgwick, W., on hereditary ten- 
dency to produce twins, i. 133. 
Seemann, Dr., on the different appre- 
ciation of music by different peo- 
ples, ii. 334 ; on the effects of 
music, ii. 335. 
Selasphorus platycercus, acuminate 
first primary of the male, ii. 65. 
Selby, P. J., on the habits of the 
black and red grouse, i. 269. 
Selection, double, i. 276. 
Selection of male by female birds, 
ii. 99, 122. 
Selection, methodical, of Prussian 
grenadiers, i. 112. 
Selection, sexual, influence of, on 
the colouring of Lepidoptera, i. 
403 ; explanation of, i. 256, 260, 
271. 
Selection, sexual and natural, con- 
trasted, i. 278. 
Self-command, habit of, inherited, 
i. 92 ; estimation of, i. 95. 
Self-consciousness, i. 62. 
Self-preservation, instinct of, i. 
89. 
Self-sacrifice, by savages, i. 88 ; 
estimation of, i. 95. 
Semilunar fold, i. 23. 
Semnopithecus, i. 197 ; long hair on 
the heads of species of, i. 192 ; ii. 
380. 
Semnopithecus cJirysomehs, sexual dif- 
ferences of colour in ii. 291. 
Semnopithecus comatus, ornamental 
hair on the head of, ii. 307. 
Semnopithecus frontatus, beard, &c., 
of, ii. 308. 
Semnopithecus nasica, nose of, i. 
192. 
Semnopithecus nemxus^ colouring of, 
ii. 310. 
Semnopithecus ruhicundus, ornamen- 
tal hair on the head of, ii. 306. 
Senses, inferiority of Europeans to 
savages in the, i. 118. 
Sentinels, i. 74, 82. 
Serpents, instinctively dreaded by 
apes and monkeys, i. 37, 42. 
Serranus, hermaphroditism in i. 208. 
Sex, inheritance limited by, i. 282. 
Sexes, relative proportions of, in 
man, i. 300, ii. 320 ; probable re- 
lation of the, in primeval man, 
ii. 362. 
Sexual characters, secondaiy, i. 253 ; 
relations of polygamy to, i. 266 ; 
transmitted through both sexes, 
