Homer, the poet, his reference to the Great Bear, 10, 19; and to Orion, 15; his scientific knowledge, 19; his conception of the earth's shape, 103, 104; quoted, 210. Honeycomb, the, of the bee, described, 85. Honeysuckle, the, celebrated by Scott, Burns, and Drayton, 380. Hood, Thomas, the poet, quoted, 190. Horace, the poet, quoted, 103. House leek, the, in the Alps, described, 418. Houston, Professor, his table of the distribution of wheat and barley, 324, 325. Howitt, Mary, the poetess, on the dragon-fly, 175. Hugi, M., the Swiss naturalist, his discovery of the Arctic vole, 49-51. Humanity, the future of, 393. Human power, limitation of, 394. Hunt, Leigh, his poem on the grasshopper, quoted, 274. Huygens, the savant, his researches into the laws of gravitation, 111. Immortality, an emblem of, in the metamorphosis of the caterpillar, 402, 403. Infusoria, the, number of, 365. Inglis, Henry, the traveller, quoted, 142. Insects, the various orders of, enumerated, 280; the number of species of, 363, 364. Jonson, Ben, the dramatist, quoted, 207, 248, 400. Kane, Dr Elisha, the American explorer, his Arctic experiences, 39. Keats, the poet, quoted, 29, 168, 190, 244, 298. Kepler, the astronomer, his adoption of the theory of the earth's rotundity, 110. Lactantius, on the non-existence of the Antipodes, 108. La Hire, the French botanist, his theory of the rise of sap, 134. Landscape, a wintry, described, 5. Leaf-wasp, the, its mode of depositing its larvæ, 71, 72. Le Monnier, the French astronomer, on the theory of the nutation of the earth, 123. Lesser celandine, the, celebrated by Wordsworth, 166; described, 166. _Libellula cancellata_, described, 177. _Libellula grandis_, described, 178. Libellulæ, the family of, its characteristics, 174-183. _See_ DRAGON-FLY. Libellulites, the family of, its general characteristics, 179, 180. Liberty, a plea for intellectual, 407. Life, origin of, speculated upon, 390, 391. Light, the nature of, 192, 193; physiological facts concerning, 194-196; the theory of, 197, 198; chemical action of, 312, 313. Liliaceæ, the family of, its characteristics, 249, 250. Lily of the field, the, of the Gospels, described, 242, 243. Lily of the valley, the, described by Shakespeare, 242; its native countries, 242. Little Bear, the, position of, 11, 12; distinct from the Great Bear, 12; first recognised by the Phœnicians, 20. Little Vulcan, the, butterfly, described by Agassiz, 71. Longfellow, the poet, his description of Orion, 13; quoted, 128, 129. Lychnis, the, described, 418. Macgillivray, the naturalist, quoted, 59, 60. Macmillan, Rev. Hugh, quoted, 42-44.