Bacteria in soil, 59-60.
Balance of nature, 151;
effects of upsetting, 151-154.
Barren Lands, 101.
Bears, in early times, 21;
in Yellowstone Park, 205.
Beaver, trapping of, 179;
protection of, 205.
Big trees of California, 49, 99.
Bird Day, observance of, 210.
Bird of paradise, nearly extinct, 187.
Bird refuges, 187, 208-209;
patrols for, 209-210.
Birds, 21;
extinct species of, 22;
destruction of, 49, 176-182;
hunting of, for millinery purposes, 183-187;
court of the, 188-194;
our good friends and pleasant companions, 195-202;
predatory, 203;
national protection of, 205-206.
Black bears, case of the, 192-193.
Blue jays, 189.
Bobolink, friends and enemies of, 189.
Bone, implements of, 3.
Boy Scouts, love of, for wild creatures, 207.
Broad-leaved and narrow-leaved trees, 98.
Bronze, making of, 5.
Browntail moth, 152.
Buffaloes, 21;
slaughter of, 177;
in Yellowstone Park, 205.

California, forests of, 49, 98;
"big trees" of, 99.
California condor, disappearance of,