grace, and at the same time invests it with the glamour of the oriental world. The most remarkable mosques are the following:--The mosque of Sultan Mahommed the Conqueror, built on the site of the church of the Holy Apostles, in 1459, but rebuilt in 1768 owing to injuries due to an earthquake; the mosques of Sultan Selim, of the Shah Zadeh, of Sultan Suleiman and of Rustem Pasha--all works of the 16th century, the best period of Turkish architecture; the mosque of Sultan Bayezid II. (1497-1505); the mosque of Sultan Ahmed I. (1610); Yeni-Valide-Jamissi (1615-1665); Nuri-Osmanieh (1748-1755); Laleli-Jamissi (1765). The Turbehs containing the tombs of the sultans and members of their families are often beautiful specimens of Turkish art. In their architecture, the mosques present a striking instance of the influence of the Byzantine style, especially as it appears in St Sophia. The architects of the mosques have made a skilful use of the semi-dome in the support of the main dome of the building, and in the consequent extension of the arched canopy that spreads over the worshipper. In some cases the main dome rests upon four semi-domes. At the same time, when viewed from the exterior, the main dome rises large, bold and commanding, with nothing of the squat appearance that mars the dome of St Sophia, with nothing of the petty prettiness of the little domes perched on the drums of the later Byzantine churches. The great mosques express the spirit of the days when the Ottoman empire was still mighty and ambitious. Occasionally, as in the case of Laleli Jamissi, where the dome rests upon an octagon inscribed in a square, the influence of SS. Sergius and Bacchus is perceptible.