134-137.
Forests, effect of cutting down of, on birds, 22;
unequal distribution of, 26-27;
destruction of, 34;
effect of destruction of, on soil, 37-38, 40-42;
possible restoration of, 47-49;
importance of, to man, 89-95;
location of, 96-103;
special sources of damage to, 104-111;
various methods by which wasted, 112-118;
government protection of, 131-138;
National Parks and Forests as playgrounds, 139-143.
France, cutting of forests and careless pasturing in, 79.
Fruit trees, enemies of, 107, 109.
Fuel, use of wood for, 90;
use of peat for, 155.
Fur seals, destruction of, 165.

Game preserves, 204-205.
Gas, waste connected with, 157-161.
Glacial soil, 65.
Goats, forests injured by, 111.
Grand Canon National Park, 140.
Grasshoppers, plagues of, 109, 151.
Great plains, 96.
Grizzly bears, destruction of, 179, 192;
in Yellowstone Park, 205.
Gusher in California oil field, 158, 159.
Gypsy moth, 106-107, 151.

Hardwood trees, 98.
Hawks, arguments for and against, 189-190.
"Heart of the Tree, The," 139.
Hens, early ancestors of, 5.
Herons, hunting of, for their plumage, 185.
Herring, waste in capture of, 166-167.
Hessian fly, 153.
Houses, the first,