660 



INDEX. 



Ripa, Father, on the difficulty of 

 aisUnguishing the races of the 

 Chinese, 163. 



Rivalry, in singing, between male 

 birds, 364. 



River-hog, African, tusks and 

 knobs of the, 516. 



Rivers, analogy of, to islands, 154. 



Roach, brightness of male during 

 breeding-season, 336. 



Robbery, of strangers, considered 

 honorable, 114. 



Robertson, Mr., remarks oh the 

 development of the horns in the 

 roebuck and red-deer, 229. 



Robin, pugnacity of the male, 360; 

 autumn song of the, 356; female 

 singing of the, 365; attacking 

 other birds with red in their 

 plumage, 407; young of the, 475. 



Robinet, on the difference of size 

 of the male and female gocoons 

 of the silk-moth, 276. 



Rodents, uterus in the, 36; ab- 

 sence of secondary sexual char- 

 acters in, 214; sexual differences 

 in the colors of, 529. 



Roe, winter change of the, 537. 



Rohlfs, Dr., Caucasian features in 

 negro, 163; fertility of mixed 

 races in Sahara, 167; colors of 

 birds in Sahara, 485; ideas of 

 beauty amongst the Bornuans, 

 576. 



Rolle, F., on the origin of man, 

 2; on a change in German fami- 

 lies settled in Georgia, 192. 



Roller, harsh cry of, 366. 



Romans, ancient, gladiatorial ex- 

 hibitions of the, 119. 



Ronjou, M. A., coincidence of ar- 

 rested development with poly- 

 dactylism, 35. 



Rook, voice of the, 370. 



Rossler, Dr., on the resemblance 

 of the lower surface of butter- 

 flies to the bark of trees, 308. 



Rostrum, sexual difference in the 

 length of, in some weevils, 204. 



Roj'er, Madlle., mammals giving 

 suck, 159. 



Rudimentary organs, 11; origin 

 of, 23. 



Rudiments, presence of, in lan- 

 guages, 87. 



Rudolphi, on the want of connec- 

 tion between climate and the 

 color of the skin, 187. 



Ruff, supposed to be polygamous, 

 215; proportion of the sexes in 

 the, 243; pugnacity of the, 357; 

 double moult in, 385, 387; dura- 

 tion of dances of, 400; attraction 

 of the, to bright objects, 407. 



Ruminants, male, disappearance 

 of canine teeth in, 52, 557; gen- 

 erally polygamous, 213; suborbit- 

 al pits of, .525: sexual differences 

 of color in, 530. 



Rupicola crocea, display of plum- 

 age by the male, 390. 



Ruppell, on canine teeth In deer 

 and antelopes, 510. 



Russia, numerical proportion of 

 male and female births in, 211, 

 237. 



Ruticilla, 455. 



Rutimeyer, Prof., on the physiog- 

 nomy of the apes, 52; on the sex- 

 ual differences of monkeys, 556. 



Rutlandshire, numerical propor- 

 tion of male and female births 

 in, 237. 



S 



Sachs, Prof., on the behavior of 

 the male and female elements \n 

 fertilization, 218. 



Sacrifices, human, 140. 



Sagittal crest in male apes and 

 Australians, 553. 



Sahara, fertility of mixed races 

 in, 167; birds of the, 450; animal 

 inhabitants of the, 485. 



Sailors, growth of, delayed by 

 conditions of life, 30; long- 

 sighted, 32. 



Sailors and soldiers, difference in 

 the proportions of, 30. 



St. John, Mr., on the attachment 

 of mated birds, 405. 



St. Kilda, beards of the inhabi- 

 tants of, 555. 



Salmo eriox, and S. umbla, color- 

 ing of the male, during the 

 breeding season, 336. 



lycaodon, 331. 



salar, 331. 



Salmon leaping out of fresh 

 water, 104; male, ready to breed 

 before the female, 208; propor- 

 tion of the sexes in, 244; male, 

 pugnacity of the, 328; male, 

 characters of during the breed- 

 ing season, 330, 336; spawning of 

 the, 341; breeding of immature 

 male, 480. 



Salvin, O.. inheritance of muti- 

 lated feathers, 57, 384, 603; on the 

 Humming-birds, 380, 597; on the 

 numerical proportion of the 

 sexes in Humming-birds, 243, 

 483; on Chamsepetes and Penel- 

 ope, 373; on Selasphorus platy- 

 cercus, 373; Pipra deliciosa, 

 374; on Chasmorhynchus, 384. 



Samoa Islands, beardlessness of 

 the natives of, 555, 575. 



Sand-skipper, 266. 



Sandwich Islands, variation in 

 the skulls of the natives of the, 

 25; decrease of native popula- 

 tion, 181; population of, 253; su- 

 periority of the nobles In the, 

 581. 



• Islanders, lice of, 166. 



San Gluliano, women of, 581. 



Santali, recent rapid increase of 

 the, 44; Mr. Hunter on the, 187. 



