eggs; vicious habits, 40;
egg-laying intervals; demoralizing conditions; American species
an improvement, 41;
survival of the fittest, 42;
balance of power, 44;
outwitted, 51;
massing for migration, 52.

"Cow-spit," 80.

Cross-fertilization, 115, 122, 178, 189, 194.

"Cuckoo-spit," 80.

Cuckoos:
--Poetic misnomer, 23;
outrage on maternal affection; yellow-billed; black-billed;
imagination versus facts, 25;
bad workmanship of nest, 26;
its stammering cry, 27;
manner of depositing its eggs; handling the egg with her bill, 33;
short period of incubation; voracious appetite of the young;
aggressive selfishness, 34;
the tragedy of the nest, 35;
manner of disposing of its nest-mates, 36.

_Cypripedium acaule_, moccasin-flower; ladies'-slipper;
Venus's-slipper, 205.

Darwin:
--Process of anatomical evolution, 35;
theory of cross-fertilization, 105;
inspired insight, 115;
his disciples, 116;
experiments with pollen, 126;
weakness of self-fertilizing flowers, 144;
triumphant revelation, 171;
reaffirming Sprengel's theory, 178;
a chosen interpreter, 181;
dependence on insects, 183;
revealing the hidden treasure, 185;
foretelling the manner of cross-fertilization, 189;
description of the cross-fertilization, 209;
bees as implied fertilizers, 212;
truth of his belief, 220.

Darning-needle, dragon-fly (_Libellulidae_), 156;
his dainty morsel, 160.

Delpino, a follower of Darwin, 116.

_Desmodium_, its hospitable welcome, 118.

Devil's-bit (_Chamaelirium luteum_), 133.

Digger wasp,
its color and wire-like waist, 72;
manner of working, 74;
covering its tracks; opening the tomb, 76;
living food for the young grub, 77;
its remarkable carrying power, 78.

Dogbane (Apocynum),
its fragrant, bell-shaped flowers, 236;
trapping moths, 237.

Dogwood, 5.

Door-Step Neighbors:
--Chronicle of a day, 58;
disappearing holes, 59, 16;
"ant-holes"; a danger signal; an unhealthy court, 61;
a transformation, 62;
an experiment; method of excavation, 63;
a stalwart worker, 64;
an uncouth nondescript; spider-like legs, 66;
crawls on his back, 67;
a tiny black wasp; a spider-catcher, 69;
resting on her wings; inspecting her burrow, 70;
manner of burying her prey; skilful workman