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their women; on the admiration of negroes for a black skin; on the idea of beauty among negroes; on the Jollofs; on the marriage-customs of the negroes.

Reason in animals.

Redstart, American, breeding in immature plumage.

Redstarts, new mates found by.

Reduvidae, stridulation of.

Reed-bunting, head-feathers of the male; attacked by a bullfinch.

Reefs, fishes frequenting.

Reeks, H., retention of horns by breeding deer; cow rejected by a bull; destruction of piebald rabbits by cats.

Regeneration, partial, of lost parts in man.

Regent bird.

Reindeer, horns of the; battles of; horns of the female; antlers of, with numerous points; winter change of the; sexual preferences shown by.

Relationship, terms of.

Religion, deficiency of among certain races; psychical elements of.

Remorse, deficiency of, among savages.

Rengger, on the diseases of Cebus Azarae; on the diversity of the mental faculties of monkeys; on the Payaguas Indians; on the inferiority of Europeans to savages in their senses; revenge taken by monkeys; on maternal affection in a Cebus; on the reasoning powers of American monkeys; on the use of stones by monkeys for cracking hard nuts; on the sounds uttered by Cebus Azarae; on the signal-cries of monkeys; on the polygamous habits of Mycetes caraya; on the voice of the howling monkeys; on the odour of Cervus campestris; on the beards of Mycetes caraya and Pithecia Satanas; on the colours of Felis mitis; on the colours of Cervus paludosus; on sexual differences of colour in Mycetes; on the colour of the infant Guaranys; on the early maturity of the female of Cebus Azarae; on the beards of the Guaranys; on the emotional notes employed by monkeys; on American polygamous monkeys.

Representative species, of birds.

Reproduction, unity of phenomena of, throughout the mammalia; period of, in birds.

Reproductive system, rudimentary structures in the; accessory parts of.

Reptiles.

Reptiles and birds, alliance of.

Resemblances, small, between man and the apes.

Retrievers, exercise of reasoning faculties by.

Revenge, manifested by animals.

Reversion, perhaps the cause of some bad dispositions.

Rhagium, difference of colour in the sexes of a species of.

Rhamphastos carinatus.

Rhea Darwinii.

Rhinoceros, nakedness of; horns of; horns of, used defensively; attacking white or grey horses.

Rhynchaea, sexes and young of.

Rhynchaea australis.

Rhynchaea bengalensis.

Rhynchaea capensis.

Rhythm, perception of, by animals.

Richard, M., on rudimentary muscles in man.

Richardson, Sir J., on the pairing of Tetrao umbellus; on Tetrao urophasianus; on the drumming of grouse; on the dances of Tetrao phasianellus; on assemblages of grouse; on the battles of male deer; on the reindeer; on the horns of the musk-ox; on antlers of the reindeer with numerous points; on the moose; on the Scotch deerhound.

Richter, Jean Paul, on imagination.

Riedel, on profligate female pigeons.

Riley, Mr., on mimicry in butterflies; bird’s disgust at taste of certain caterpillars.

Ring-ouzel, colours and nidification of the.

Ripa, Father, on the difficulty of distinguishing the races of the Chinese.

Rivalry, in singing, between male birds.

River-hog, African, tusks and knobs of the.

Rivers, analogy of, to islands.

Roach, brightness of the male during breeding-season.

Robbery, of strangers, considered honourable.

Robertson, Mr., remarks on the development of the horns in the roebuck and red deer.

Robin, pugnacity of the male; autumn song of the; female singing of the; attacking other birds with red in their plumage; young of the.

Robinet, on the difference of size of the male and female cocoons of the silk-moth.

Rodents, uterus in the; absence of secondary sexual characters in; sexual differences in the colours of.

Roe, winter changes of the.

Rohfs, Dr., Caucasian features in negro; fertility of mixed races in Sahara; colours of birds in Sahara; ideas of beauty amongst the Bornuans.

Rolle, F., on the origin of man; on a change in German families settled in Georgia.

Roller, harsh cry of.

Romans, ancient, gladiatorial exhibitions of the.

Rook, voice of the.

Rossler, Dr., on the resemblance of the lower surface of butterflies to the bark of trees.

Rostrum, sexual difference in the length of in some weevils.

Royer, Madlle., mammals giving suck.

Rudimentary organs, origin of.

Rudiments, presence of, in languages.

Rudolphi, on the want of connexion between climate and the colour of the skin.

Ruff, supposed to be polygamous; proportion of the sexes in the; pugnacity of the; double moult in; duration of dances of; attraction of the, to bright objects.

Ruminants, male, disappearance of canine teeth in; generally polygamous; suborbital pits of; sexual differences of colour in.

Rupicola crocea, display of plumage by the male.

Ruppell, on canine teeth in deer and antelopes.

Russia, numerical proportion of male and female births in.

Ruticilla.

Rutimeyer, Prof., on the physiognomy of the apes; on tusks of miocene boar; on the sexual differences of monkeys.

Rutlandshire, numerical proportion of male and female births in.

Sachs, Prof., on the behaviour of the male and female elements in fertilisation.

Sacrifices, human.

Sagittal crest, in male apes and Australians.

Sahara, fertility of mixed races in; birds of the; animal inhabitants of the.

Sailors, growth of, delayed by conditions of life; long-sighted.

Sailors and soldiers, difference in the proportions of.

St. John, Mr., on the attachment of mated birds.

St. Kilda, beards of the inhabitants of.

Salmo eriox, and Salmo umbla, colouring of the male, during the breeding season.

Salmo lycaodon.

Salmo salar.

Salmon, leaping out of fresh water; male, ready to breed before the female; proportion of the sexes in; male, pugnacity of the; male, characters of, during the breeding season; spawning of the; breeding of immature male.

Salvin, O., inheritance of mutilated feathers; on the Humming-birds; on the numerical proportion of the sexes in Humming-birds; on Chamaepetes and Penelope; on Selasphorus platycercus; Pipra deliciosa; on Chasmorhynchus.

Samoa Islands, beardlessness of the natives of.

Sandhoppers, claspers of male.

Sand-skipper.

Sandwich Islands, variation in the skulls of the natives of the; decrease of native population; population of; superiority of the nobles in the.

Sandwich Islanders, lice of.

San-Giuliano, women of.

Santali, recent rapid increase of the; Mr. Hunter on the.

Saphirina, characters of the males of.

Sarkidiornis melanonotus, characters of the young.

Sars, O., on Pontoporeia affinis.

Saturnia carpini, attraction of males by the female.

Saturnia Io, difference of coloration in the sexes of.

Saturniidae, coloration of the.

Savage, Dr., on the fighting of the male gorillas; on the habits of the gorilla.

Savage and Wyman on the polygamous habits of the gorilla.

Savages, uniformity of, exaggerated; long-sighted; rate of increase among, usually small; retention of the prehensile power of the feet by; imitative faculties of; causes of low morality of; tribes of, supplanting one another; improvements in the arts among; arts of; fondness of, for rough music; on long-enduring fashions among; attention paid by, to personal appearance; relation of the sexes among.

Saviotti, Dr., division of malar bone.

Saw-fly, pugnacity of a male.

Saw-flies, proportions of the sexes in.

Saxicola rubicola, young of.

Scalp, motion of the.

Scent-glands in snakes.

Schaaffhausen, Prof., on the development of the posterior molars in different races of man; on the jaw from La Naulette; on the correlation between muscularity and prominent supra-orbital ridges; on the mastoid processes of man; on modifications of the cranial bones; on human sacrifices; on the probable speedy extermination of the anthropomorphous apes; on the ancient inhabitants of Europe; on the effects of use and disuse of parts; on the superciliary ridge in man; on the absence of race-differences in the infant skull in man; on ugliness.

Schaum, H., on the elytra of Dytiscus and Hydroporus.

Scherzer and Schwarz, measurements of savages.

Schelver, on dragon-flies.

Schiodte, on the stridulation of Heterocerus.

Schlegel, F. von, on the complexity of the languages of uncivilised peoples.

Schlegel, Prof., on Tanysiptera.

Schleicher, Prof, on the origin of language.

Schomburgk, Sir R., on the pugnacity of the male musk-duck of Guiana; on the courtship of Rupicola crocea.

Schoolcraft, Mr., on the difficulty of fashioning stone implements.

Schopenhauer, on importance of courtship to mankind.

Schweinfurth, complexion of negroes.

Sciaena aquila.

Sclater, P.L., on modified secondary wing-feathers in the males of Pipra; on elongated feathers in nightjars; on the species of Chasmorhynchus; on the plumage of Pelecanus onocrotalus; on the plantain-eaters; on the sexes and young of Tadorna variegata; on the colours of Lemur macaco; on the stripes in asses.

Scolecida, absence of secondary sexual characters in.

Scolopax frenata, tail feathers of;

Scolopax gallinago, drumming of.

Scolopax javensis, tail-feathers of.

Scolopax major, assemblies of.

Scolopax Wilsonii, sound produced by.

Scolytus, stridulation of.

Scoter-duck, black, sexual difference in coloration of the; bright beak of male.

Scott, Dr., on idiots smelling their food.

Scott, J., on the colour of the beard in man.

Scrope, on the pugnacity of the male salmon; on the battles of stags.

Scudder, S.H., imitation of the stridulation of the Orthoptera; on the stridulation of the Acridiidae; on a Devonian insect; on stridulation.

Sculpture, expression of the ideal of beauty by.

Sea-anemones, bright colours of.

Sea-bear, polygamous.

Sea-elephant, male, structure of the nose of the; polygamous.

Sea-lion, polygamous.

Seal, bladder-nose.

Seals, their sentinels generally females; evidence furnished by, on classification; polygamous habits of; battles of male; canine teeth of male; sexual differences; pairing of; sexual peculiarities of; in the coloration of; appreciation of music by.

Sea-scorpion, sexual differences in.

Season, changes of colour in birds, in accordance with the; changes of plumage of birds in relation to.

Seasons, inheritance at corresponding.

Sebituani, African chief, trying to alter a fashion.

Sebright Bantam.

Secondary sexual characters; relations of polygamy to; transmitted through both sexes; gradation of, in birds.

Sedgwick, W., on hereditary tendency to produce twins.

Seemann, Dr., on the different appreciation of music by different peoples; on the effects of music.

Seidlitz, on horns of reindeer.

Selasphorus platycercus, acuminate first primary of the male.

Selby, P.J., on the habits of the black and red grouse.

Selection as applied to primeval man.

Selection, double.

Selection, injurious forms of, in civilised nations.

Selection of male by female birds.

Selection, methodical, of Prussian grenadiers.

Selection, sexual, explanation of; influence of, on the colouring of Lepidoptera.

Selection, sexual and natural, contrasted.

Self-command, habit of, inherited; estimation of.

Self-consciousness, in animals.

Self-preservation, instinct of.

Self-sacrifice, by savages; estimation of.

Semilunar fold.

Semnopithecus, long hair on the heads of species of.

Semnopithecus chrysomelas, sexual differences of colour in.

Semnopithecus comatus, ornamental hair on the head of.

Semnopithecus frontatus, beard etc., of.

Semnopithecus nasica, nose of.

Semnopithecus nemaeus, colouring of.

Semnopithecus rubicundus, ornamental hair on the head of.

Senses, inferiority of Europeans to savages in the.

Sentinels, among animals.

Serpents, instinctively dreaded by apes and monkeys.

Serranus, hermaphroditism in.

Setina, noise produced by.

Sex, inheritance limited by.

Sexes, relative proportions of, in man; proportions of, sometimes influenced by selection; probable relation of the, in primeval man.

Sexual and natural selection, contrasted.

Sexual characters, effects of the loss of; limitation of.

Sexual characters, secondary; relations of polygamy to; transmitted through both sexes; gradation of, in birds.

Sexual differences in man.

Sexual selection, explanation of; influence of, on the colouring of Lepidoptera; objections to; action of, in mankind.

Sexual selection in spiders.

Sexual selection, supplemental note on.

Sexual similarity.

Shaler, Prof., sizes of sexes in whales.

Shame.

Sharks, prehensile organs of male.

Sharpe, Dr., Europeans in the tropics.

Sharpe, R.B., on Tanysiptera sylvia; on Ceryle; on the young male of Dacelo Gaudi-chaudi.

Shaw, Mr., on the pugnacity of the male salmon.

Shaw, J., on the decorations of birds.

Sheep, danger-signals of; sexual differences in the horns of; horns of; domestic, sexual differences of, late developed; numerical proportion of the sexes in; inheritance of horns by one sex; effect of castration; mode of fighting of; arched foreheads of some.

Sheep, Merino, loss of horns in females of; horns of.

Shells, difference in form of, in male and female Gasteropoda; beautiful colours and shapes of.

Shield-drake, pairing with a common duck; New Zealand, sexes and young of.

Shooter, J., on the Kaffirs; on the marriage-customs of the Kaffirs.

Shrew-mice, odour of.

Shrike, Drongo.

Shrikes, characters of young.

Shuckard, W.E., on sexual differences in the wings of Hymenoptera.

Shyness of adorned male birds;

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