Part 28

Forest-trees of low growth, 34

Forest-trees, uses of equatorial, 35

Forests, effect of on rainfall and drought, 19 devastation caused by destruction of, 20 equatorial, 29 undergrowth of tropical, 34

Formica gigas, 81

Foxes, none in Isle of Wight in 1605, 305

Frogs and toads, 116

Frog, with bright colours uneatable, 175

Frogs of oceanic islands, 309

Fruit-bats, 119

Fruits of equatorial forest-trees, 36

Fruits, attractive colours of, 224 protective colours of, 225 greater antiquity of protected than attractive, 227

Galapagos, colours of productions of, 163 poor in flowers and insects, 235 weedy vegetation of, 272

Gardner, Dr., on a large water-boa, 115

Geckos, 112

Geiger, on ancient perception of colour, 245

Geranium pratense, G. pusillum, 233

Gibbons, 116

Ginger-worts, 47

Gladstone, Mr., on the colour-sense, 245

Glow-worm, use of its light, 205

Goliath cuckoo, 105

Gosse, Mr., on Jamaica humming-birds, 132, 135 on the pugnacity of humming-birds, 134 on food of humming-birds, 137

Gould, Mr., on the motions of humming-birds, 131

Grammatophyllums, 51

Green, why the most agreeable colour, 244

Grisebach, on cause of vivid colours of arctic flowers, 237

Guilielma speciosa, 42

Gums from equatorial forest-trees, 36