Part 19

Jenner, Dr., habits of the young cuckoo, 35.

Knight, 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; American varieties not air-plants; form of flower, 181; elasticity of the pollen of the Spectabilis, 182; self-fertilizing, 183; American and exotic species, 184; Arethusa's fragrance, 185; its structure, 186; significant depth of nectar wells; conditions demanded of insects, 187; Gray's surmise, 188; sphinx-moth its only complement, 190; manner of carrying the pollen by sphinx-moth, 193; extracting the pollen with a pencil; length of the nectary, 196; purple-fringed, 198; ragged, 200; very exceptional provision, 201; yellow-spiked, 203; moccasin-flower; ladies'-slipper; Venus's-slipper; the color of, 205; distinctive character of, 206; practical experiment, 209; imprisonment of the bee; manner of its release, 210; rattlesnake-plantain, 213; Angraecum, its long nectary, 219; tongue of a sphinx-moth eleven inches long, 220; nectary thirteen inches long, 223.

"Origin of Species": --First important presentation of the theory of cross-fertilization, 105; tardy appreciation of the work, 115.

Odynerus flavipes, wren-wasp, 10.

Ovid, concerning hornets, 18.

Parallels in Nature, 152.