The Palazzo Dario with its dedication, Urbis genio, the superb Manzoni-Montecuculi-Polignac, with its friezes of spread-eagles in low relief, and the Vendramini-Calergi or Non nobis palace, whose facade is characterized by its roundheaded windows of grouped twin lights between columns, are among the more important; though beautiful specimens, such as the Palazzo Trevisan on the Rio della Paglia, and the Palazzo Corner Reali at the Fava, are to be found all over the city.
Manzoni in 1887 have led to a fairly complete knowledge of all that part of the province west of the capital Sana; while in 1902-1904 the operations of the Anglo-Turkish boundary commission permitted the execution of a systematic topographical survey of the British protectorate from the Red Sea to the Wadi Bana, 30 m.
From observations made at Sana by Manzoni, Defiers and Glaser, the mean temperature for the year of that city at an altitude of 7300 ft.
At higher elevations the rainfall is no doubt heavier; Manzoni mentions that at Sana there was constant rain throughout August and September 1878, and that the thermometer during August did not reach 65°.
Manzoni estimated their number in Sana in 1878 at 1700 out of a total population of 20,000; at Aden they are a numerous and wealthy community, with agents in most of the towns of Yemen.