Quagga, striped
Quatrefages, M., on hybrid moths
Quercus, variability of
Quince, grafts of
Rabbits, disposition of young
Races, domestic, characters of
Race-horses, Arab --English
Radcliffe, Dr., the electrical organs of the torpedo
Ramond, on plants of Pyrenees
Ramsay, Prof., on subaerial denudation --on thickness of the British formations --on faults
Ramsay, Mr., on instincts of cuckoo
Ratio of increase
Rats, supplanting each other --acclimatisation of --blind, in cave
Rattle-snake
Reason and instinct
Recapitulation, general
Reciprocity of crosses
Record, geological, imperfect
Rengger, on flies destroying cattle
Reproduction, rate of
Resemblance, protective, of insects --to parents in mongrels and hybrids
Reversion, law of inheritance --in pigeons, to blue colour
Rhododendron, sterility of
Richard, Prof., on Aspicarpa
Richardson, Sir J., on structure of squirrels --on fishes of the southern hemisphere
Robinia, grafts of
Rodents, blind
Rogers, Prof., Map of N. America
Rudimentary organs
Rudiments important for classification
Rutimeyer, on Indian cattle
Sageret, on grafts
Salamandra atra
Saliva used in nests
Salmons, males fighting, and hooked jaws of
Salt-water, how far injurious to seeds --not destructive to land-shells
Salter, Mr., on early death of hybrid embryos
Salvin, Mr., on the beaks of ducks
Saurophagus sulphuratus
Schacht, Prof., on Phyllotaxy
Schiodte, on blind insects --on flat-fish
Schlegel, on snakes
Schobl, Dr., on the ears of mice
Scott, Mr. J., on the self-sterility of orchids --on the crossing of varieties of verbascum
Sea-water, how far injurious to seeds --not destructive to land-shells
Sebright, Sir J., on crossed animals
Sedgwick, Prof., on groups of species suddenly appearing
Seedlings destroyed by insects
Seeds, nutriment in --winged --means of dissemination --power of resisting salt-water --in crops and intestines of birds --eaten by fish --in mud --hooked, on islands
Selection of domestic products --principle not of recent origin --unconscious --natural --sexual --objections to term --natural, has not induced sterility
Sexes, relations of
Sexual characters variable --selection
Sheep, Merino, their selection --two sub-breeds, unintentionally produced --mountain, varieties of
Shells, colours of, littoral --hinges of --seldom embedded
Shells, fresh-water, long retain the same forms --fresh-water, dispersal of --of Madeira --land, distribution of --land, resisting salt water
Shrew-mouse
Silene, infertility of crosses
Silliman, Prof., on blind rat
Sirenia, their affinities
Sitaris, metamorphosis of
Skulls of young mammals
Slave-making instinct
Smith, Col. Hamilton, on striped horses
Smith, Dr., on the Polyzoa
Smith, Mr. Fred., on slave-making ants --on neuter ants
Snake with tooth for cutting through egg-shell
Somerville, Lord, on selection of sheep
Sorbus, grafts of
Sorex
Spaniel, King Charles' breed
Specialisation of organs
Species, polymorphic --dominant --common, variable --in large genera variable --groups of, suddenly appearing --beneath Silurian formations --successively appearing --changing simultaneously throughout the world
Spencer, Lord, on increase in size of cattle
Spencer, Mr. Herbert, on the first steps in differentiation --on the tendency to an equilibrium in all forces
Sphex, parasitic
Spiders, development of
Sports in plants
Sprengel, C.C., on crossing --on ray-florets
Squalodon
Squirrels, gradations in structure
Staffordshire, heath, changes in
Stag-beetles, fighting
Star fishes, eyes of --their pedicellariae
Sterility from changed conditions of life --of hybrids --laws of --causes of --from unfavourable conditions --not induced through natural selection
St. Helena, productions of
St. Hilaire, Aug., on variability of certain plants --on classification
St. John, Mr., on habits of cats
Sting of bee
Stocks, aboriginal, of domestic animals
Strata, thickness of, in Britain
Stripes on horses
Structure, degrees of utility of
Struggle for existence
Succession, geological --of types in same areas
Swallow, one species supplanting another
Swaysland, Mr., on earth adhering to the feet of migratory birds
Swifts, nests of
Swim-bladder
Switzerland, lake inhabitants of
System, natural