20; how excusing realization, iii. 186. Commerce, how regarded by Venetians, i. 6. Composition, definition of the term, ii. 182. Constancy, how symbolized, ii. 333. Construction, architectural, how admirable, i. 36. Convenience, how consulted by Gothic architecture, ii. 179. Cornices, general divisions of, i. 63, iii. 248; of walls, i. 60; of roofs, i. 149; ornamentation of, i. 305; curvatures of, i. 310; military, i. 160; Greek, i. 157. Courses in walls, i. 60. Crockets, their use in ornamentation, i. 346; their abuse at Venice, iii. 109. Crosses, Byzantine, ii. 139. Crusaders, character of the, ii. 263. Crystals, architectural appliance of, i. 225. Cupid, representation of, in early and later art, ii. 342. Curvature, on what its beauty depends, i. 222, iii. 5. Cusps, definition of, i. 135; groups of, i. 138; relation of, to vegetation, ii. 219; general treatment of, iii. 255; earliest occurrence of, ii. 220. D Daguerreotype, probable results of, iii. 169. Darkness, a character of early churches, ii. 18; not an abstract evil, iii. 220. Death, fear of, in Renaissance times, iii. 65, 90, 92; how anciently regarded, iii. 139, 156. Decoration, true nature of, i. 405; how to judge of, i. 44, 45. See "Ornament." Demons, nature of, how illustrated by Milton and Dante, iii. 147. Dentil, Venetian, defined, i. 273, 275. Design, definition of the term, ii. 183; its relations to naturalism, ii. 184. Despair, how symbolized, ii. 334. Diaper patterns in brick, i. 296; in color, iii. 21, 22. Discord, how symbolized, ii. 333. Discs, decoration by means of, i. 240, 416; ii. 147, 264. Division of labor, evils of, ii. 165. Doge of Venice, his power, i. 3, 360. Dogtooth moulding defined, i. 269. Dolphins, moral disposition of, i. 230; use of, in symbolic representation of sea, i. 422, 423. Domestic architecture, richness of, in middle ages, ii. 99. Doors, general structure of, i. 174, 176; smallness of in English cathedrals, i. 176; ancient Venetian, ii. 277, iii. 227. Doric architecture, i. 157, 301, 307; Christian Doric, i. 308, 315. Dragon, conquered by St. Donatus, ii. 33; use of, in ornamentation, ii. 219. Dreams, how resembled by the highest arts, iii. 153; prophetic, in relation to the Grotesque, iii. 156. Dress, its use in ornamentation, i. 212; early Venetian, ii. 383; dignity of, iii. 191; changes in modern dress, iii. 192. Duties of buildings, i. 47. E