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.