Della Porta, 73; façade of ch. of the Gesù, Rome, 95 (cut). Dolcebono, architect, Church of Monastero Maggiore, Milan, 142, 143. Domes, construction of early, 10–15; hidden externally by drum and timber roof, 10, 11 (cut); Byzantine, on pendentives, 10 (cut), 29^1; polygonal, 12, 24^3; pointed in outline, 12, 14, 16, 52; octagonal, 13, 14, 16; hemispherical, 24^3, 52; Arabian, 12^1; binding chains, 12, 241; the thrust, 15^1, 24, 52; why a dome cannot have the character of a Gothic vault, 20, 21, 56–59 (cuts); proper mode of constructing, settled by the ancient Romans and Byzantines, 63; attempt of the architects of the Renaissance to solve the great dome problem, 241, 242; most modern domes modelled after St. Peter’s and St. Paul’s are wooden constructions, 242; of Hagia Theotokos, Constantinople, 10 (cut); of Florence cathedral, 10–25, 65, design of Arnolfo, 13, modelled on dome of Baptistery, 16, details of construction, 16–20, magnitude of the work, 21, stability of, 23; of Florence Baptistery, details of construction, 14 (cut), dome of Florence cathedral derived from, 16, 20; vault of the chapel of the Pazzi, Florence, not a dome, 27 (cut), 28, 56; ch. of San Lorenzo, Florence, 34; vault of ch. of Santo Spirito, Florence, 34; St. Paul’s, London, rejected scheme, 235 (cut), likeness to Bramante’s scheme for St. Peter’s, Rome, 236 (cut), likeness to Michael Angelo’s scheme, 237, present structure, 239 (plate), recalls Bramante’s San Pietro in Montorio, Rome, 239, structural system of, 239–242 (cut); ch. of Santa Maria delle Grazie, Milan, 140 (cut); vault of the chapel of St. Peter Martyr, ch. of Sant’Eustorgio, Milan, like vault of chapel of the Pazzi, Florence, 142; ch. of San Biagio at Montepulciano, 81 (cut); Pisa cathedral, 12 (cut); ch. of Sant’Andrea di Ponte Molle, Rome, 86; Antonio San Gallo’s design for St. Peter’s, Rome, 71; Tempietto, Rome, 44 (cut); cath. of Salamanca approaches the nature of a Gothic vault, 57–59 (cut); Todi, 74 (cut), 77. Domestic architecture. _See_ Palace architecture. Doorway, of De l’Orme, 203 (cut); of Serlio, 203 (cut). Drum, of a dome, raised above the springing of the dome, 10–14, 23; dome set on the top of, 12; of the dome of Florence cathedral, 16; the central vault of the chapel of the Pazzi, Florence, 27 (cut); the Tempietto of San Pietro in Montorio, Rome, 44; St. Peter’s, Rome, 50 (cut), 53.