22, 180.
"Passing of the Forest, The," 130.
Pear blight, 109.
Peat, crumbling vegetation called, 57;
use of, for fuel, 155.
Peat soils, 58, 59, 66.
Phosphorus in soil, 59.
Pine beetles, 110.
Pinon pines, 99.
Plant food, 45, 60.
Plants, enemies of, 104-111.
Plumage, hunting of birds for, 183-187, 207-208.
Polar bear, protection needed by, 181.
Potash in soil, 59.
Powder, discovery of, 8.
Prairie chicken, disappearance of, 180.
"Preceptor's Plea for the Birds, The," 211-212.
Pueblo Indians, 19-20.

Quail, need for protection of, to preserve from extinction, 180;
cheery call of, 195;
value and attractiveness of, 201;
insects eaten by, 202.
Quartz, in sand grains, 58.
Quinine, made from cinchona tree, 95.

Rabbits, as pests, 152.
Rainier National Park, 140.
Rats, plagues of, 151.
Redwood trees, 99.
Refuges for birds, 22.
Residual soil, 64.
Rocks, soil made from, 58, 61-66.
Rocky Mountain sheep, in Yellowstone Park, 205.
Rubber trees, 93.

Sage grouse, need for protection of, 180.
Salmon fisheries, 169-170.
San Joaquin V