Constellations, table of the number of stars in the northern, southern, and zodiacal, 27, 28. _Convallaria majalis._ _See_ LILY OF THE VALLEY. Convolvulus, the, described, 383, 384. Copernicus, the astronomer, his theory of the earth's rotundity, 110; antiquity of his so-called theory, 118, 119. Cornwall, Barry, the poet, quoted, 229. Corolla, the, of flowers, 214, 215, 223; varieties of, 225-229. Crabbe, George, the poet, quotation from, 288. _Cynodon dactylon_, the, described, 91-93. Daisy, the, described by Chaucer, 138, 140; by Cowper, 139; by James Montgomery and William Browne, 140; its vegetation, 140, 141; described, 142-145; referred to by the ancients, 145; and by the botanists of the Middle Ages, 146; characterised by Wepfer, Tournefort, and Garidel, 147; its medical properties, 146, 147; George Withers' tribute to, 148; celebrated by Wordsworth, 149, 150; by Shakespeare and Milton, 151, 152. Darwin, Erasmus, the poet, on the pimpernel, 261. David's Chariot, position of, 8, 9. Day and night, varying length of, 198, 199. Delphos, the "navel of the world," 107. Democritus, the philosopher, on the Milky Way, 25. Dent de Jaman, the, described, 257. Desor, M., the Swiss naturalist, his discovery of the snow-flea, 72, 73. _Desoria saltans_, the, described, 73; _glacialis_, description of, 74. Dial, floral, referred to and exemplified, 217, 218. Diodorus, the historian, quoted, 93, 94. Dioscorides, the author of "Materia Medica," his reference to Mercury's plant, 81; on the _Agrostis_, 95. Diurnal movement of the stars, origin of its discovery, 16. Dobell, Sydney, the poet, quoted, 129, 131. Dogma, folly of, 292. Dog Mercury, the, its power of propagation, 77, 78; described by Mr Sowerby, 78; how distinguished from weeds, 79; its diœcious character, 80; mentioned by Pliny the naturalist, 80, 81; and by Dioscorides, 81; its disappearance before the power of snow, 81. Dog-star, the. _See_ SIRIUS. Dog's-tooth grass, the, characteristics of, features of, described, 91-93; its emollient properties, 96. Draco, the constellation of, known to the ancients, 22. Dragon-fly, the, described by the poets, 174, 175; its destructive properties, 175; the female, 182, 183; its metamorphosis, 183-187. Drayton, Michael, the poet, his description of a spring-time posy, 159-161; on carnations, 371. Drummond, William, the poet, quoted, 399, 400. Dutrochet, the philosopher, his theory of the rise of sap, 136. Eagle, the, its affection for the mountains, 57; its flight described, 58-62; its nest, 62; the various species of, 62, 63.