| PAGE | |
| Abyla | 63 |
| Acanthometra | 57 |
| Actinea Cari, varieties of | 66 |
| —— mesembryanthemum | 54 |
| Acanthostratus | 57 |
| Actinozoa | 51, 52 |
| Æschna | 77 |
| Agalma breve | 64 |
| Agrion puella | 77 |
| Aiptasia mutabilis | 67 |
| Albinism in butterflies | 79 |
| Alcyonariæ | 54 |
| Allman, Prof., on Hydroids | 59, 60 |
| "Alps and Sanctuaries" quoted | 36 |
| Amœba | 56 |
| Amphibia | 89 |
| Amphilonche | 57 |
| Andres, Dr., on Hydrozoa | 65 |
| Anemonia sulcata | 67 |
| Anemones, Sea | 52 |
| Animals and Plants, origin of | 36 |
| —— classification of | 49 |
| Anœchtochilus | 95 |
| Anteater | 93 |
| Anthocaris belemia | 41 |
| —— belia | 42 |
| —— cardamines | 41, 42 |
| —— euphemoides | 43 |
| —— eupheno | 42 |
| —— simplonia | 42 |
| Apatura iris | 46 |
| —— larvæ of | 81 |
| Arachnida | 82 |
| Araschnia Levana | 43, 45 |
| —— porima | 43, 45, 79 |
| —— prorsa | 43, 45 |
| Arctia | 69 |
| Arachnocorys | 57 |
| Argus Pheasant | 6, 39, 91 |
| Argynnis Lathonia | 69 |
| Armadillo | 84 |
| Arthropoda, colouration of | 85 |
| Ascidians | 35 |
| Automatic habits | 9 |
| Arthorybia rosacea | 64 |
| Badger | 93 |
| Begonia | 95 |
| Birds, colouration of | 89 |
| —— of Paradise | 90 |
| Biston betularia | 79 |
| Black and White, production of | 28 |
| Blackwell, J., on British Spiders | 82 |
| Blatta | 14 |
| Bougainvillea | 16 |
| Bower Birds | 5 |
| Bunodes crassicornis | 54 |
| —— gemmaceus, varieties of | 66 |
| —— rigidus | 67 |
| Burnet Moths | 5, 69 |
| Butler S., on inherited memory | 9, 10, 11, 15 |
| —— on origin of animals and plants | 36 |
| Butterflies, albinism in | 79 |
| —— classification of | 74 |
| —— sense organs of | 30 |
| —— varieties of | 77 |
| Caladium | 95 |
| Calathea | 96 |
| Calycophoridæ | 63 |
| Carcinus mœnas | 4 |
| Carcinus mœnas | 4 |
| Carpocanium | 57 |
| Cats, colouration of | 17, 92 |
| —— recognising form | 32 |
| Caterpillars, colours of | 81 |
| —— spiracular markings | 22 |
| Cephalopoda | 87 |
| Cerithium | 86 |
| Char | 88 |
| Chlorophyll in hydra | 59 |
| Cicada | 77 |
| Cladococeus | 57 |
| Classification of animals | 49 |
| —— of butterflies | 74 |
| Cœlenterata | 20 |
| —— colouration in | 51 |
| Cœlodendrum | 57 |
| Cœnonympha davus | 79 |
| —— pamphilus | 79 |
| Cœnosarc | 55 |
| Coleus | 95 |
| Colour and form | 32 |
| —— and transparency | 53 |
| —— epidermal | 72 |
| —— following structure | 83, 91 |
| —— hypodermal | 53, 73 |
| —— nature of | 25 |
| —— of day-and-night flying insects | 47, 69 |
| —— opaque | 53 |
| —— perception of | 5, 23, 25, 32 |
| —— uniform, why rare | 28 |
| Colouration | 3 |
| —— laws of | 21, 51 |
| —— of desert animals | 4 |
| —— of arthropoda | 85 |
| —— of cœlenterata | 51, 59 |
| —— of insects | 68 |
| —— of invertebrata | 49 |
| —— of molluscs | 85 |
| —— of plants | 94 |
| —— of protozoa | 51 |
| —— of spiders | 82 |
| —— of vertebrata | 88 |
| —— sexual | 5 |
| —— varieties of | 3 |
| Contour feathers | 91 |
| Conus | 86 |
| Coppinia arcta | 60 |
| Corallium rubrum | 54 |
| Corals | 54 |
| Correlation of teeth and hair | 94 |
| Corynida | 52 |
| Cowries | 86 |
| Crab, shore | 4 |
| Croton | 46 |
| Cuttle-fishes | 19, 87 |
| Cyllo leda | 45 |
| Cynthia cardui | 68 |
| Cypræa | 86 |
| Cyrtidosphæra | 57 |
| Dallas, W. S., on butterflies | 71 |
| Danais | 72 |
| —— niavius | 30, 80 |
| Darwin, C. | 1, 2, 5, 9, 11, 14, 45, 47, 94 |
| Darwin, Dr. E., cited | 37 |
| Deer | 92 |
| Deformity, antipathy to | 32 |
| Deilephila Euphorbiæ | 81 |
| —— galii | 81 |
| Descent with modification | 1 |
| Desert animals, colour of | 4 |
| Dictyoceras | 57 |
| Dictyophimus | 57 |
| Diphyes | 63 |
| Disease, markings in | 39, 44 |
| Distant, W. L., on Malayan butterflies | 80 |
| Distinctive Colouration | 3 |
| Dogs recognising portraits | 32 |
| Dracæna ferrea | 96 |
| Elephant, increase of | 2 |
| Engelmann on Euglena | 34 |
| Epidermal colour | 72 |
| Eresus cinnabarinus | 82 |
| Eucecryphalus | 57 |
| Eucrytidium | 57 |
| Euglena viridis | 34 |
| Evolution | 1-98 |
| Eye-spots | 45, 47 |
| Fayrer, Sir W., on snakes | 89 |
| Feathers | 91 |
| Fishes, colours of | 88 |
| Foal, stripes on | 46 |
| Foraminiferæ | 56 |
| Fuller, W. J., on aquatic larvæ | 77 |
| Gamopetalous flowers | 96 |
| Gegenbaur's "Comparative Anatomy" cited | 82 |
| General colouration | 3 |
| Gloxinia | 96 |
| Gomphina | 77 |
| Gonepteryx Cleopatra | 41, 42 |
| —— rhamni | 40, 42 |
| Gonophores | 52 |
| Grapta interrogationis | 79 |
| Gregarinidæ | 56 |
| Guinea-fowl | 91 |
| Haagen, Dr., on colour | 53, 72 |
| Habits | 8 |
| Haeckel, Prof., on Radiolaria | 57 |
| Hair and teeth, correlation of | 94 |
| Hawk moths | 69 |
| Hebrides, colours of insects in | 80 |
| Heredity | 2 |
| Herpes | 40, 93 |
| Heteromorphism | 78 |
| Higgins, Rev. H. H. | 39 |
| Hoverer flies | 84 |
| Humming birds | 90, 92 |
| Hutchinson, Mr., on herpes | 40 |
| Huxley, Prof., on hydrozoa | 63 |
| Hydra viridis | 59 |
| Hydrida | 59 |
| Hydrozoa | 51, 59 |
| Hypodermal colour | 53, 72 |
| Identity of offspring and parent | 11 |
| Identity, personal | 10 |
| Inherited memory | 8 |
| Insects, colour in | 68, 75 |
| John Dory | 89 |
| Kallima inachus | 30, 80 |
| Kentish Glory Moth | 30 |
| Lamium galeobdolon | 96 |
| Lankester, Prof. Ray, on development of eyes | 97 |
| Large Copper Butterfly | 68 |
| Larvæ, colours of | 45, 81 |
| Laws of emphasis | 21 |
| —— exposure | 18 |
| —— heredity | 2 |
| —— multiplication | 2 |
| —— repetition | 21, 22 |
| —— structure | 18 |
| —— variation | 2 |
| Leaf-butterfly | 16, 30 |
| Leidy, Prof., on Rhizopoda | 56 |
| Leopard | 17, 92 |
| Leucophasia diniensis | 41 |
| —— sinapis | 41 |
| "Life and Habit" cited | 9 |
| Light, reflected | 26 |
| —— sensibility to | 33 |
| —— waves | 25 |
| Liminitis sibilla | 43 |
| Lion | 17, 92 |
| —— stripes on young | 46 |
| Lithocysts of hydroids | 62 |
| Lucernaria auricula | 65 |
| Lycæna dispar | 68 |
| Lycosa agretyca | 83 |
| —— allodroma | 83 |
| —— andrenivora | 83 |
| —— cambria | 84 |
| —— campestris | 83 |
| —— latitans | 84 |
| —— picta | 84 |
| —— piratica | 84 |
| —— rapax | 83 |
| Mackerel | 88 |
| Mactra | 86 |
| —— stultorum | 87 |
| Madrepores | 54 |
| Mammalia, colouration in | 92 |
| Margarita catenata | 87 |
| Measles | 39 |
| Medusæ | 52, 65 |
| Melanism in insects | 79 |
| Meldola, Prof. R., on Melanism | 79 |
| Melitæa artemis | 43 |
| —— athalia | 43 |
| Mimicry | 3, 4 |
| Mollusca | 21 |
| —— colouration in | 85 |
| Monstrosities, antipathy to | 32 |
| Morphinæ | 72 |
| Morpho | 4 |
| Murex | 86 |
| Muscles of insects | 71 |
| Nectarinea chloropygea | 90 |
| Newman, Mr., on varieties of butterflies | 77 |
| Newts | 89 |
| Nitzsch on feather-tracts | 91 |
| Nudibranchs | 85 |
| Nymphalidæ | 74 |
| Oak Egger Moth | 30 |
| Ocelli | 47 |
| Ocelot | 93 |
| Oliva | 86 |
| Opaque colouring | 53 |
| Organ-pipe coral | 54 |
| Origin of animals and plants | 36 |
| —— — species | 1 |
| Orthopœcilism | 78 |
| Oxen | 94 |
| Painted Lady Butterfly | 68 |
| Pangenesis | 12 |
| Papilio Ajax | 79 |
| —— machaon | 43, 68, 76, 78 |
| —— —— larva of | 81 |
| —— merope | 30, 76, 80 |
| —— nireus | 14 |
| —— podalirius | 43 |
| Paradisea Papuana | 90 |
| —— regia | 90 |
| —— speciosa | 90 |
| —— Wallacei | 90 |
| —— Wilsoni | 90, 91 |
| Pavetta Borbonica | 96 |
| Pecten | 86 |
| Pelargonium | 96 |
| Perch | 88 |
| Personal identity | 10 |
| Physalia | 63 |
| —— caravilla | 64 |
| —— pelagica | 64 |
| —— utriculus | 64 |
| Physophoridæ | 63 |
| Plaice | 88 |
| Plants and animals, origin of | 36 |
| —— colour in | 95 |
| Pneumatophores | 63 |
| Portuguese Man o' War | 63 |
| Protective resemblance | 3 |
| Protista | 34 |
| Protozoa | 20 |
| —— colouration in | 51, 56 |
| Python | 89 |
| Radiolaria | 57 |
| Rarity of uniform colour | 28 |
| Ray Lankester, Prof., on Ascidians | 35 |
| Red Admiral Butterfly | 29 |
| Repetition, effects of | 8 |
| Reptilia, colouration in | 89 |
| Resemblance, Protective | 3 |
| Rhizophora filiformis | 64 |
| Rhizopoda | 56 |
| Rhododendron | 96 |
| Ringlet Butterflies, eye-spots of | 47 |
| Roach | 88 |
| Romanes, Prof., cited | 33, 34 |
| Satyrus hyperanthus | 79 |
| Scales of insects, structure of | 72 |
| Scarlet Tiger Moth | 5 |
| Sea anemones | 52 |
| —— —— colours of | 67 |
| Seasonal dimorphism | 70 |
| Sea squirts | 35 |
| Segestria senoculata | 83 |
| Selection, sexual | 5 |
| Self-coloured flowers | 28 |
| Sense organs of Butterflies | 30 |
| Sertularidæ | 63 |
| Sexual colours | 4 |
| —— selection | 5 |
| —— dimorphism | 70 |
| Shell, Structure of | 85 |
| Shore Crab | 4 |
| Simple variation in Butterflies | 77 |
| Siphonophora | 63 |
| Small pox | 39 |
| Snakes, patterns of | 89 |
| Sollas, Prof., on Sponges | 58 |
| Soles | 88 |
| Sparassus smaragdulus | 82 |
| Species, origin of | 1 |
| Sphæronectes | 63 |
| Sphingidæ | 45, 69 |
| Spiders, structure and colour of | 82 |
| Spiracles of larvæ | 22 |
| Spondylus | 86 |
| Sponges | 57 |
| Spongida | 57 |
| Spongocyclia | 57 |
| Spots and Stripes | 39 |
| Stephanomia amphitridis | 63 |
| Struggle for existence | 2 |
| Sun-birds | 90 |
| Sus vittatus | 46, 94 |
| Sutton, Mr. Bland, on Herpes | 40 |
| Swallow-tailed Butterflies | 68 |
| Syncoryne pulchella | 62 |
| Systems of colouration | 51 |
| Teeth and Hair, correlation of | 94 |
| Thomisus cinereus | 82 |
| —— floricolens | 82 |
| Thomisus luctuosus | 84 |
| —— trux | 82 |
| Thrush, increase of | 2 |
| Tiger | 17, 92 |
| —— Moths | 69 |
| Tipula | 33 |
| Toucans | 90, 92 |
| Transparency and colour | 53 |
| Trigonia | 86 |
| Tubipora musica | 54 |
| Tubularida | 59 |
| Tylor, A., on Specific change | 10 |
| Vanessa Antiopa | 76 |
| —— atalanta | 29, 43, 69 |
| —— urticæ | 77 |
| Variation in insects | 70 |
| —— law of | 2 |
| —— simple, in Butterflies | 77 |
| Velella | 52, 65 |
| Vertebrata, colouration of | 88 |
| Viverridæ | 94 |
| Wallace, A. R., on sexual selection | 5, 6, 14, 15 |
| —— on colour | 29 |
| —— on abnormal structures | 94 |
| Warning colours | 4 |
| Wasps | 84 |
| Weir, J. Jenner, on variation in insects | 78 |
| Weismann, Dr., on Caterpillars | 81 |
| Wing of Butterfly, typical | 70 |
| —— patterns of | 76 |
| Woodpecker | 91 |
| Yellow Archangel | 96 |
| Zebra | 92 |
| Zygæna | 69 |