ht, Andrew:
--On the divination of flowers, 108;
theory of cross-fertilization, 115.

Koehlreuter:
--Recognizing Sprengel's principles, 108;
a botanical pioneer, 115.

Krunitz, on flower honey, 111.

Labiates, flowers with lips, 122.

Ladies'-tresses (_Spiranthes_), 218.

Larva:
--Hornet, 16;
"puss-moth," 76;
psychid, 83.

Linnaeus:
--Settling the theory of fertilization, 110;
puzzled as to the function of honey, 111;
a second step, 116;
imperfect knowledge of the orchid, 173.

Logan, concerning the cuckoo, 23.

Lubbock:
--On the divination of flowers, 108;
follower of Darwin, 116;
on the cultivation of aphides, 166.

Martial Spirit of Vespa, 19.

_Membracis binotata_, insect with a sharp beak, a tree-hopper, 91.

Milkweed:
--Its matchless hospitality;
purple pompons;
its five horns, 227;
its one mission;
the humming-bird its friend, 228;
complex mechanism;
enticing fragrance;
removal of pollen on insects' legs, 229;
four captives, 230;
its honey trap;
its tenacious grip, 233;
an assortment of victims;
cumbersome handicap, 234;
a wholesale destroyer, 235.

Mint family, 122.

_Mnio-tiltidae_, summer yellow-bird, 47.

Moccasin-flower (_Cypripedium acaule_), 205.

Moths:
--Twilight;
sphinx, 118, 190, 220;
grape-vine, 160.

Mountain laurel:
--Showers of pollen of;
curious construction of flower of;
withers if brought indoors, 124;
character of the pollen, 125.

Mouse, motley collection of food of;
mischief of, 7.

Mueller, Hermann:
--On the divination of flowers, 108;
on defective observation, 114;
the relations between the flower and insect, 116;
on fertilization, 142

Nature's Equilibrium, 39.

Natural observation, 57.

Nomadic blossoms, 83.

Orchids:
--Dependence on insects, 144;
strange mechanical adaptation;
sweet-pogonia;
perfume suggesting raspberries, 145;
intention of the blossom, 146;
adaptation for insects, 147;
its fragrance a perfumed whisper of welcome, 148;
a contrast, 172;
form of invitation, 173;
insect complement, 174;
Arethusa bulbosa, 175;
theories concerning the conveyance of the pollen, 176;
the most highly specialized form of flowers, 180;
distinguished by its structure;
Am