26;
results in, of loss of soil, 79;
treatment of birds in, 196.
Spruce forest, destruction of, by forest fires, 126.
Squirrels, nuts of trees eaten by, 109;
ground, as pests, 152.
Stone, implements of, 3.
Sturgeon, destructive fishing of, 167.
Subsoil, 64.
Sugar pines, 99;
nuts of, eaten by squirrels, 109;
careless cutting of, 115.
Swallows, insects eaten by, 199.
Switzerland, care of wood in, 93, 114.
Syria, destruction of vegetation in, 79.

Tamarack forests, use of, 126.
Trees, destruction of, 12;
importance of, to man, 89-95;
distribution of, in United States, 96-103;
enemies of, 104-111;
the careless wasting of, 111-118.
Tundras of far North, 101.
Turpentine obtained from yellow pines, 93.

Valley lands, 40, 42;
fertility of, 53;
alluvial soil in, 64.
Vegetation, holding of soil by, 67-72;
results of lack of, 73-80.

Walrus, nearly extinct, 165.
Water, obtaining of pure, 10-11;
home of, the ocean, 81;
use and care of, 81-88.
Water creatures, need for protection of, 162-170.
Water power, use of, 157.
Water supply, effect upon, of cutting of forests, 127-129.
Weasels, defense of,