France, cultivation of purple variety | Grassi, discovery of the history of the of poppy in, 364 French archeologists, leading dis- 372 Frogs, common, eggs of, 209, 212 European species, 216, 219 green tree-frog of Riviera, 49, 50, method of catching prey, 219 Gases- oxygen, action of ordinary, 259 proportion of, to fresh country use in water-purification, 256, Geology, Darwin's discoveries in, 24 table showing history of man in Western Europe, 384 bis Germany, custom of eating preserves eel by, 70-72 Green tree-frog, 49, 50 Guinea-pig, native home and original various names given to, 360, 361 Halley, Edmund, astronomical dis- date of death, 230 law of movement of comets dis- Milton and, scholars of St. Paul's Newton and, friendship of, 230 Hay fever, individual susceptibility similarity between vegetable Heart, action of nervous system upon, muscular contraction, 150, 151 cause of, rate of beat in higher and lower in human species, 151, 152 Henslow, Professor, Darwin as in- Herschel, Sir John, definition of 15 Hertwig, Professor, German repre- Gnats, Anopheles, malaria germ Hill, Dr. Leonard, experiments of, carried by, 3 with regard to use of oxygen Hipparion horse, 84, 85, 86 Hooker, Sir Joseph, Darwin and Hop-blight, causes of, 317-319 Hop-louse, 317 Horses-continued selective breeding of, from time of presence House-sparrows, 266 Hops, brewing industry as affecting Huxley, Professor, calculation of, growers of, 321 cultivation of, 315-316 curing of, 320 English growers as affected by uses made of, 315 Horses, absence from continent in American with regard to fecundity of Hydra, heraldic, derivation of, 116 Kew Gardens, beauty and interest of, specimens of Rhus toxicodendron Koch (Berlin), cholera-bacillus dis- tubercle-bacillus 240 Ladybird, 325 discovered by, Lamarck, inferiority of scientific Philosophical Zoology by, 20 Herbert Spencer's definition of, 183, Light, rate at which it travels, 221 Malaria, comparative death-rate from, Mammoth age, 380, 386 Man, sleep of, compared with repose Mankind, congenital defects in, Mental defect, 274 |