have perceptions but no conceptions, 160;
first steps of intelligence in, 161, 162;
limitations of intelligence in, 163-168;
automatism of trained animals, 166;
incredible stories of, 175-184;
stories of surgery among, 180-182;
true interpretation of seeming acts of reason in, 184-187, 189, 190;
absence of language among, 187-189;
creatures of routine, 190;
the humanization of, 195, 196;
nature of their intelligence, 209-230;
their minds incapable of improvement, 220-222;
the victims of habits, 222;
popular notion of teaching among, 233, 234;
nature of the homing faculty of, 235;
Bostock on the training of wild, 239-242;
mimicry among, 248-250;
instinct in, 255-261.

Antelope, 85.

Apple trees, protecting themselves from cattle, 153.

Argyll, Duke of, 72.

"Atlantic Monthly, The," article in, v, vi, 173.

Baboon, 65.

Barrington, Daines, 68.

Barrus, Dr. Clara,
her description of the woodcock's song and song flight, 43.

Bean, the, intelligence of, 1, 2.

Bear, a caged, 76.

Bear, black, 260.

Beaver, 166, 167;
nature of his intelligence, 209-211.

Beebe, C. William, on instinct and reason in birds, 215-217.

Bees, 24.

Belief, scientific grounds for, 173-179.

Birds,
mistakes of, 4-6;
their nest-building, 4, 5, 70, 71;
fighting their reflections, 5, 6;
taking advantage of man's protection for their nests, 6, 7;
probably make no improvement in nest-building or singing, 70, 71;
learn cunning by experience, 71;
instincts connected with parasitism, 79, 80;
communication in flocks of, 96-98;
courtship of, 103, 104;
activities of the two sexes among, 111-114;
song contests among, 114, 115;
and glass, 127;
incubating-habits of, 135;
shading mate and young from sun, 137, 138;
their knowledge of the value of protective coloration, 138-140;
migration of, 186;
their affection for their young, 215;
and shell-fish, 216;
have no power of initiative, 232, 233;
their handling of strings, 246-248;
instinct in, 256-261;
variability in, 258-261.

Bird's-nests,
an epitome of wild nature, 109;
haphazard design in, 109, 110.

Bird-songs,
the power to hear, 29;
not music, 29;
elusiveness of, 30;
a part of nature, 30;
our pleasure in them from association, 31-34;