Burnett, Sir William, by mistake introduces in the Navy juice of the sour-lime in place of lemon-juice, 236 Burning water, fountains of, 225 Butterflies of the genus Vanessa, 97 several different species of white and of blue, 97 several species united to form one larger kind–a genus, 95 species of, 94 the kinds of, 94 Caloric, an assumed entity, 186 Cannel (or candle) coal, 219 Carbon, weight of, annually discharged over London, 218 Carboniferous system, the, 221 Cats, male, with blue eyes are deaf, 120 Cause of survival in the struggle for life, 118, 119 Cave of Altamira, 28, 47 of Brassempouy, 51 of Combarelles, 32 of Font de Gaume, 29, 32 of Laugerie basse, 46 of Lortet, 1 of Marsoulas (Haute Garonne), 43 of Mas d'Azil, 43 of Niaux (Ariège), 43 of St. Michel d'Arudy, 45 Caves, pictures on walls of, 7 Census of species of animals, 129 Chick, Dr. Harriette, secretary, and Dr. Hopkins, F.R.S., chairman, of a committee investigating accessory food-factors, 234 Chinese "great monad," 210 Circle, how to divide it so as to describe a Tomoye, 214 _Citrus medica limonum_, the lemon, 236 _acida_, the West Indian sour-lime, 236 Coal, 217-222 mines, annual output of, 221 Coal-tar, 224 Coffer-fish, 130 Cold, action of extreme, in preventing chemical combination, 177 Copan, circular altar-stone from, divided by an S-shaped trough so as to resemble the Tomoye, 213 Correlated characters or structures, 119, 125 Crab, common shore, variations in, 118 Crag, the Red, of Suffolk, 38 the Norwich, 38 Crayfish, species of, 120 Cromagnard race, 8, 9 Cross-breeding of races, 140-156 Crystal Palace, the, sixty years ago, 84 Decorative design, 200-208 Deer, the picture of the Three, 13 Dewar, Sir James, his important experiments on action of cold and of light on phosphorescent bacteria, 188 Diplodocus, a gigantic reptile, 85, 91 Discoveries falsely announced, and others misrepresented or unnoticed by newspapers, 173, 176 Dolphins (oceanic colour-changing fish), 130 Equus the horse genus, the history of, 103 Exuberances of non-significant growth, 127, 130 Fat boys of journalism, 173 Fertilization, resistance to hybrid, 136, 137, 138 Fish drawn between horse's legs, 23 Fishes, examples of strangely-shaped, 130 Fleas, species of, 105 Flowers of tan survive desiccation, 179 Food, the accessory factors in, 233 Fylfot, the, 191 Gammadion, the, 191 Geometrical properties of the Tomoye, 216 Germ variation, a constant process, 112 Gigantic reptiles, 85, 87 Gigantosaurus, discovery of, in Africa, 87 upper-arm bone of, compared with that of an elephant and of man, 88 Gills of crayfishes, 121 a new one discovered by a lady student at Oxford, 123 Glacial period, 6 Goose engraved on reindeer antler, 49