3.
Huckleberry shrub, cutting of, 147, 149.
Humming birds, use of skins of, for capes, 186.
Humus, in soil, 57;
destruction of, by forest fires, 123, 125.

Indians, life of, 19-23;
uses found by, for wood, 90;
fishing methods of, 163.
Insect enemies of trees, 106, 109, 110, 152-154;
warfare waged against, by forest rangers, 136-137;
eaten by birds, 197-202.
"In the Heart of the Woods," 24.
Iron, found in quartz sand, 58.
Irrigation, storage of water for, 84, 85, 87.
Italy, results of destruction of forests in, 77, 79;
wild chestnuts valued in, 90;
scarcity of birds in, 196.

Jays, arguments for and against, 189.
Jungle fowls, wild, 5.
Junior Audubon Societies, work of, 207.

Klamath Lake, bird refuge about, 187.
Korea, results of destruction of vegetation in, 79-80;
dikes built along rivers in, 80.

Lightning, an enemy of the forest, 110-111;
fires started by, 121.
Limestone soils, 59.
Loam, clay and sandy, 58.
Lobsters, protection of, 167.
Los Angeles, water supply of, 29-30.
Lumber, an important use of trees, 90.
Lumbering, waste of trees in, 114-118.

Malheur Lake, bird refuge about, 187.
Maple sugar, 93.
Martins, insects eaten by, 199.
Meadow larks, 191-1