A., on land-shells Gould, Mr., on colours of birds -- on instincts of cuckoo -- on distribution of genera of birds Gourds, crossed Graba, on the Uria lacrymans Grafting, capacity of Granite, areas of denuded Grasses, varieties of Gray, Dr.Asa, on the variability of oaks -- on man not causing variability -- on sexes of the holly -- on trees of the United States -- on naturalised plants in the United States -- on aestivation -- on rarity of intermediate varieties -- on Alpine plants Gray, Dr.J.E., on striped mule Grebe Grimm, on asexual reproduction Groups, aberrant Grouse, colours of -- red, a doubtful species Growth, compensation of Gunther, Dr., on flat-fish -- on prehensile tails -- on the fishes of Panama -- on the range of fresh-water fishes -- on the limbs of Lepidosiren Haast, Dr., on glaciers of New Zealand Habit, effect of, under domestication -- effect of, under nature -- diversified, of same species Hackel, Prof., on classification and the lines of descent Hair and teeth, correlated Halitherium Harcourt, Mr.E.V., on the birds of Madeira Hartung, M., on boulders in the Azores Hazel-nuts Hearne, on habits of bears Heath, changes in vegetation Hector, Dr., on glaciers of New Zealand Heer, Oswald, on ancient cultivated plants -- on plants of Madeira Helianthemum Helix pomatia, resisting salt water Helmholtz, M., on the imperfection of the human eye Helosciadium Hemionus, striped Hensen, Dr., on the eyes of Cephalopods Herbert, W., on struggle for existence -- on sterility of hybrids Hermaphrodites crossing Heron eating seed Heron, Sir R., on peacocks Heusinger, on white animals poisoned by certain plants Hewitt, Mr., on sterility of first crosses Hildebrand, Prof., on the self-sterility of Corydalis Hilgendorf, on intermediate varieties Himalaya, glaciers of -- plants of Hippeastrum Hippocampus Hofmeister, Prof., on the movements of plants Holly-trees, sexes of Hooker, Dr., on trees of New Zealand -- on acclimatisation of Himalayan trees -- on flowers of umbelliferae -- on the position of ovules -- on glaciers of Himalaya -- on algae of New Zealand -- on vegetation at the base of the Himalaya -- on plants of Tierra del Fuego -- on Australian plants -- on relations of flora of America -- on flora of the Antarctic lands -- on the plants of the Galapagos -- on glaciers of the Lebanon -- on man not causing variability -- on plants of mountains of Fernando Po Hooks on palms -- on seeds, on islands Hopkins, Mr., on denudation Hornbill, remarkable instinct of Horns, rudimentary Horse, fossil in La Plata -- proportions of, when young Horses destroyed by flies in Paraguay -- striped Horticulturists, selection applied by Huber on cells of bees Huber, P., on reason blended with instinct -- on habitual nature of instincts -- on slave-making ants -- on Melipona domestica Hudson, Mr., on the Ground-woodpecker of La Plata -- on the Molothrus Humble-bees, cells of Hunter, J., on secondary sexual characters Hutton, Captain, on crossed geese Huxley, Prof., on structure of hermaphrodites -- on the affinities of the Sirenia -- on forms connecting birds and reptiles -- on homologous organs -- on the development of aphis Hybrids and mongrels compared Hybridism Hydra, structure of Hymenoptera, fighting Hymenopterous insect, diving Hyoseris Ibla Icebergs transporting seeds Increase, rate of Individuals, numbers favourable to selection -- many, whether simultaneously created Inheritance, laws of -- at corresponding ages Insects, colour of, fitted for their stations -- sea-side, colours of -- blind, in caves -- luminous -- their resemblance to certain objects -- neuter Instinct, not varying simultaneously with structure Instincts, domestic Intercrossing, advantages of Islands, oceanic Isolation favourable to selection Japan, productions of Java, plants of Jones, Mr.J.M., on the birds of Bermuda Jordain, M., on the eye-spots of star fishes Jukes, Prof., on subaerial denudation Jussieu on classification Kentucky, caves of Kerguelen-land, flora of Kidney-bean, acclimatisation of Kidneys of birds Kirby, on tarsi deficient in beetles Knight, Andrew, on cause of variation Kolreuter, on intercrossing -- on the barberry -- on sterility of hybrids -- on reciprocal crosses -- on crossed varieties of nicotiana -- on crossing male and hermaphrodite flowers Lamarck, on adaptive characters Lancelet, eyes of Landois, on the development of the wings of insects Land-shells, distribution of -- of Madeira, naturalised -- resisting salt water Languages, classification of Lankester, Mr.E.Ray, on longevity -- on homologies Lapse, great, of time Larvae Laurel, nectar secreted by the leaves Laurentian formation Laws of variation Leech, varieties of Leguminosae, nectar secreted by glands Leibnitz, attack on Newton Lepidosiren, limbs in a nascent condition Lewes, Mr.G.H., on species not having changed in Egypt -- on the Salamandra atra -- on many forms of life having been at first evolved Life, struggle for Lingula, Silurian Linnaeus, aphorism of Lion, mane of -- young of, striped Lobelia fulgens Lobelia, sterility of crosses Lockwood, Mr., on the ova of the Hippocampus Locusts transporting seeds Logan, Sir W., on Laurentian formation Lowe, Rev.R.T., on locusts visiting Madeira Lowness, of structure connected with variability -- related to wide distribution Lubbock, Sir J., on the nerves of coccus -- on secondary sexual characters -- on a diving hymenopterous insect -- on affinities -- on metamorphoses Lucas, Dr.P., on inheritance -- on resemblance of child to parent Lund and Clausen, on fossils of Brazil Lyell, Sir C., on the struggle for existence -- on modern changes of the earth -- on terrestrial animals not having been developed on islands -- on a carboniferous land-shell -- on strata beneath Silurian system -- on the imperfection of the geological record -- on the appearance of species -- on Barrande's colonies -- on tertiary formations of Europe and North America -- on parallelism of tertiary formations -- on transport of seeds by icebergs -- on great alternations of climate -- on the distribution of fresh-water shells -- on land-shells of Madeira Lyell and Dawson, on fossilized trees in Nova Scotia Lythrum salicaria, trimorphic Macleay, on analogical characters Macrauchenia McDonnell, Dr., on electric organs Madeira, plants of -- beetles of, wingless -- fossil land-shells of -- birds of Magpie tame in Norway Males, fighting Maize, crossed Malay Archipelago, compared with Europe -- mammals of Malm, on flat-fish Malpighiaceae, small imperfect flowers of Mammae, their development -- rudimentary Mammals, fossil, in secondary formation -- insular Man, origin of Manatee, rudimentary nails of Marsupials, fossil species of Marsupials of Australia, structure of their feet Martens, M., experiment on seeds Martin, Mr.W.C., on striped mules Masters, Dr., on Saponaria Matteucci, on the electric organs of rays Matthiola, reciprocal crosses of Maurandia Means of dispersal Melipona domestica Merrill, Dr., on the American cuckoo Metamorphism of oldest rocks Mice destroying bees -- acclimatisation of -- tails of Miller, Prof., on the cells of bees Mirabilis, crosses of Missel-thrush Mistletoe, complex relations of Mivart, Mr., on the relation of hair and teeth -- on the eyes of cephalopods -- various objections to Natural Selection -- on abrupt modifications -- on the resemblance of the mouse and antechinus Mocking-thrush of the Galapagos Modification of species, not abrupt Moles, blind Molothrus, habits of Mongrels, fertility and sterility of -- and hybrids compared Monkeys, fossil Monachanthus Mons, Van, on the origin of fruit-trees Monstrosities Moquin-Tandon, on sea-side plants Morphology Morren, on the leaves of Oxalis Moths, hybrid Mozart, musical powers of Mud, seeds in Mules, striped Muller, Adolph, on the instincts of the cuckoo Muller, Dr.Ferdinand, on Alpine Australian plants Muller, Fritz, on dimorphic crustaceans -- on the lancelet -- on air-breathing crustaceans -- on the self-sterility of orchids -- on embryology in relation to classification -- on the metamorphoses of crustaceans -- on terrestrial and fresh-water organisms not undergoing any metamorphosis -- on climbing plants Multiplication of species not indefinite Murchison, Sir, R., on the formations of Russia -- on azoic formations -- on extinction Murie, Dr., on the modification of the skull in old age Murray, Mr.A., on cave-insects Mustela vison Myanthus Myrmecocystus Myrmica, eyes of Nageli, on morphological characters Nails, rudimentary Nathusius, Von, on pigs Natural history, future progress of -- selection -- system Naturalisation of forms distinct from the indigenous species -- in New Zealand Naudin, on analagous variations in gourds -- on hybrid gourds -- on reversion Nautilus, Silurian Nectar of plants Nectaries, how formed Nelumbium luteum Nests, variation in Neuter insects New Zealand, productions of, not perfect -- naturalised products of -- fossil birds of -- glaciers of -- crustaceans of -- algae of -- number of plants of -- flora of Newman, Col., on humble-bees Newton, Prof., on earth attached to a partridge's foot Newton, Sir I., attacked for irreligion Nicotiana, crossed varieties of -- certain species very sterile Nitsche, Dr., on the Polyzoa Noble, Mr., on fertility of Rhododendron Nodules, phosphatic, in azoic rocks Oak, varieties of Onites apelles Orchids, fertilisation of -- the development of their flowers -- forms of Orchis, pollen of Organisation, tendency to advance Organs of extreme perfection -- electric, of fishes -- of little importance -- homologous -- rudiments of, and nascent Ornithorhynchus, mammae of Ostrich not capable of flight -- habit of laying eggs together -- American, two species of Otter, habits of, how acquired Ouzel, water Owen, Prof., on birds not flying -- on vegetative repetition -- on variability of unusually developed parts -- on the eyes of fishes -- on the swim-bladder of fishes -- on fossil horse of La Plata -- on generalised form -- on relation of ruminants and pachyderms -- on fossil birds of New Zealand -- on succession of types -- on affinities of the dugong -- on homologous organs -- on the metamorphosis of cephalopods Pacific Ocean, faunas of Pacini, on electric organs Paley, on no organ formed to give pain Pallas, on the fertility of the domesticated descendants of wild stocks Palm with hooks Papaver bracteatum Paraguay, cattle destroyed by flies Parasites Partridge, with ball of dirt attached to foot Parts greatly developed, variable Parus major Passiflora Peaches in United States Pear, grafts of Pedicellariae Pelargonium, flowers of -- sterility of Peloria Pelvis of women Period, glacial Petrels, habits of Phasianus, fertility of hybrids Pheasant, young, wild Pictet, Prof., on groups of species suddenly appearing -- on rate of organic change -- on continuous succession of genera -- on close alliance of fossils in consecutive formations -- on change in latest tertiary forms -- on early transitional links Pierce, Mr., on varieties of wolves Pigeons with feathered feet and skin between toes -- breeds described, and origin of -- breeds of, how produced -- tumbler, not being able to get out of egg -- reverting to blue colour -- instinct of tumbling -- young of Pigs, black, not affected by the paint-root -- modified by want of exercise Pistil, rudimentary Plants, poisonous, not affecting certain coloured animals -- selection, applied to -- gradual improvement of -- not improved in barbarous countries -- dimorphic -- destroyed by insects -- in midst of range, have to struggle with other plants -- nectar of -- fleshy, on sea-shores -- climbing -- fresh-water, distribution of -- low in scale, widely distributed Pleuronectidae, their structure Plumage, laws of change in sexes of birds Plums in the United States Pointer dog, origin of -- habits of Poison not affecting certain coloured animals Poison, similar effect of, on animals and plants Pollen of fir-trees -- transported by various means Pollinia, their development Polyzoa, their avicularia Poole, Col., on striped hemionus Potemogeton Pouchet, on the colours of flat-fish Prestwich, Mr., on English and French eocene formations Proctotrupes Proteolepas Proteus Psychology, future progress of Pyrgoma, found in the chalk 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 Tail of giraffe -- of aquatic animals -- prehensile -- rudimentary Tanais, dimorphic Tarsi deficient Tausch, Dr., on umbelliferae Teeth and hair correlated -- rudimentary, in embryonic calf Tegetmeier, Mr., on cells of bees Temminck, on distribution aiding classification Tendrils, their development Thompson, Sir W., on the age of the habitable world -- on the consolidation of the crust of the earth Thouin, on grafts Thrush, aquatic species of -- mocking, of the Galapagos -- young of, spotted -- nest of Thuret, M., on crossed fuci Thwaites, Mr., on acclimatisation Thylacinus Tierra del Fuego, dogs of -- plants of Timber-drift Time, lapse of -- by itself not causing modification Titmouse Toads on islands Tobacco, crossed varieties of Tomes, Mr., on the distribution of bats Transitions in varieties rare Traquair, Dr., on flat-fish Trautschold, on intermediate varieties Trees on islands belong to peculiar orders -- with separated sexes Trifolium pratense -- incarnatum Trigonia Trilobites -- sudden extinction of Trimen, Mr., on imitating-insects Trimorphism in plants Troglodytes Tuco-tuco, blind Tumbler pigeons, habits of, hereditary -- young of Turkey-cock, tuft of hair on breast Turkey, naked skin on head -- young of, instinctively wild Turnip and cabbage, analogous variations of Type, unity of Types, succession of, in same areas Typotherium Udders enlarged by use -- rudimentary Ulex, young leaves of Umbelliferae, flowers and seeds of -- outer and inner florets of Unity of type Uria lacrymans Use, effects of -- under domestication -- in a state of nature Utility, how far important in the construction of each part Valenciennes, on fresh-water fish Variability of mongrels and hybrids Variation, under domestication -- caused by reproductive system being affected by conditions of life -- under nature -- laws of -- correlated Variations appear at corresponding ages -- analogous in distinct species Varieties, natural -- struggle between -- domestic, extinction of -- transitional, rarity of Varieties, when crossed -- fertile -- sterile -- classification of Verbascum, sterility of -- varieties of, crossed Verlot, M., on double stocks Verneuil, M.de, on the succession of species Vibracula of the Polyzoa Viola, small imperfect flowers of -- tricolor Virchow, on the structure of the crystalline lens Virginia, pigs of Volcanic islands, denudation of Vulture, naked skin on head Wading-birds Wagner, Dr., on Cecidomyia Wagner, Moritz, on the importance of isolation Wallace, Mr., on origin of species -- on the limit of variation under domestication -- on dimorphic lepidoptera -- on races in the Malay Archipelago -- on the improvement of the eye -- on the walking-stick insect -- on laws of geographical distribution -- on the Malay Archipelago -- on mimetic animals Walsh, Mr.B.D., on phytophagic forms -- on equal variability Water, fresh, productions of Water-hen Waterhouse, Mr., on Australian marsupials -- on greatly developed parts being variable -- on the cells of bees -- on general affinities Water-ouzel Watson, Mr.H.C., on range of varieties of British plants -- on acclimatisation -- on flora of Azores -- on rarity of intermediate varieties -- on Alpine plants -- on convergence -- on the indefinite multiplication of species Weale, Mr., on locusts transporting seeds Web of feet in water-birds Weismann, Prof., on the causes of variability -- on rudimentary organs West Indian islands, mammals of Westwood, on species in large genera being closely allied to others -- on the tarsi of Engidae -- on the antennae of hymenopterous insects Whales Wheat, varieties of White Mountains, flora of Whittaker, Mr., on lines of escarpment Wichura, Max, on hybrids Wings, reduction of size -- of insects homologous with branchiae -- rudimentary, in insects Wolf crossed with dog -- of Falkland Isles Wollaston, Mr., on varieties of insects -- on fossil varieties of shells in Madeira Wollaston, Mr., on colours of insects on sea-shore -- on wingless beetles -- on rarity of intermediate varieties -- on insular insects -- on land-shells of Madeira naturalised Wolves, varieties of Woodcock with earth attached to leg Woodpecker, habits of -- green colour of Woodward, Mr., on the duration of specific forms -- on Pyrgoma -- on the continuous succession of genera -- on the succession of types World, species changing simultaneously throughout Wright, Mr.Chauncey, on the giraffe -- on abrupt modifications Wrens, nest of Wyman, Prof., on correlation of colour and effects of poison -- on the cells of the bee Youatt, Mr., on selection -- on sub-breeds of sheep -- on rudimentary horns in young cattle Zanthoxylon Zebra, stripes on Zeuglodons.