INDEX. 



399 



FOR 



Forest trees. See Trees; Vegetable 



Life 



Forest, voices of the, 70 

 Fowl, digestive apparatus of the, 299 

 Frigate-bird, his prodigious flight, 287 

 Frog-fish, its mode of progression, 261, 



262 

 Frogs, their means of escape from 



enemies, 270 

 Fungi, their enormous reproductive 



powers, 51, 52, 85 

 their sporules, 85 



PALL-NUTS, origin of, 216 



U Garden spiders, 238 

 Gasteropoda, or snails, 154 



their internal structure, 154 



their shells, 155 



their operculum, 155 



their masticatory apparatus, 156 



their digestive apparatus, 158 



their caution, 159 



Gecarcini, or land-crabs, legs of the, 



178 

 Gecko, toes of the, 273 



memory of the, 281 



his means of escape from his enemies, 



359 



Gibraltar, Kock of, apes of the, 357 

 Giraffe, tongue of the, 349 

 Gizzards of birds, 299 

 Glaciers, their importance to the valleys, 

 34 



rate of their progress, 34 

 Glauci, 157 



Goby, the black, its parental affection, 



267 

 Gravitation, Newton's discovery of the 



universal law of, 4 

 Greeks, their knowledge of the form of 



the earth, 3 



Grosbeak, social, nest of the, 308 

 Guinea-fowl, beak of the, 294 

 Gyrini, or whirligigs, 200 



HAG, respiratory "apparatus of the, 

 260 



Hail, causes of, 28, 30 

 Halibut, immense size of the, 249 

 Halichondria, 112 

 Halina papillaris, 113 

 Hamsters, cheek -pouches of the, 350 

 their burrows, 363 

 Hare, formation of the, 328 



jumping hare, 329 



provisions for its safety, 361 

 Hassar, its mode of progression, 261 



its parental affection, 267 

 Hawk-moth, caterpillar of, 208 



INS 



Heat, various sources of, 11 



effects of, 12 



nature of heat, 15 



heat the first grand cause of the 



winds, 17 



Hedgehog, armour of the, 367 

 Hedysarum gyrans, motion of the leaves 



of, 76 



Hemp-plants, usefulness of the, 67 

 Herbs, stems of, 67 

 Hermit-crabs, or paguri, 187 

 Herschel, Sir W., his discovery of 



Uranus, 5 



Hippidse, legs of the, 178 

 Hippopotamus, senses of the, 361 

 Hirudo medicinalis, mouth of the, 169 

 Holothurise, or sea-cucumbers, 139 

 Hoofs of ruminants, 359 

 Horns of animals as defensive weapons, 



359 

 Horses, hoofs of, as a defensive weapon, 



359 



caution of wild horses, 369 



affection of the horse for man, 373 



his sagacity, 377 

 Humming-bird, bill of the, 294 

 Humus, or vegetable mould, properties 



of the, 62 



Hunting spiders, 240 

 Hysenas, their mode of life, 356 

 Hyalea globulosa, 159 

 Hybernation of animals, 379 

 Hydrometridse, 201 



TANTHIN^E, their air-bladders, 155 

 J_ their means of defence, 155 

 Ibis, head and legs of the, 291 

 Ice, its protection of animal life, 32-34 



effects of a desert of ice on the earth, 



35 

 Ichneumon, his destruction of reptiles 



and their eggs, 285 

 Ichneumon-fly, instincts of the, 223 

 Iguana, its means of defence, 274 

 Infusoria, 106 



various forms of, 107 



their range of habitation, 110 



their mode of reproduction, 110 



their encysting process, 110 

 Insects, 189 



harmonious balance between leaves 



and, 77 



as a means of fructification of plants, 



their integuments, 189 



the insect-skeleton, 190 



their metamorphoses, 191 

 larvae, 191 



pupse, 192 



the perfect insect, 192 



