The houses of the Latookas are generally bell-shaped, while others are precisely like huge candle-extinguishers, about twenty-five feet high. The roofs are neatly thatched, at an angle of about 75 degrees, resting upon a circular wall about four feet high; thus the roof forms a cap descending to within two feet and a half of the ground. The doorway is only two feet and two inches high, thus an entrance must be effected upon all-fours. The interior is remarkably clean, but dark, as the architects have no idea of windows. It is a curious fact that the circular form of but is the only style of architecture adopted among all the tribes of Central Africa, and also among the Arabs of Upper Egypt; and that, although these differ more or less in the form of the roof, no tribe has ever yet sufficiently advanced to construct a window. The town of Tarrangolle is arranged with several entrances, in the shape of low archways through the palisades; these are closed at night by large branches of the hooked thorn of the kittur bush (a species of mimosa). The main street is broad, but all others are studiously arranged to admit of only one cow, in single file, between high stockades; thus, in the event of an attack, these narrow passages could be easily defended, and it would be impossible to drive off their vast herds of cattle unless by the main street. The large cattle kraals are accordingly arranged in various quarters in connexion with the great road, and the entrance of each kraal is a small archway in the strong iron-wood fence sufficiently wide to admit one ox at a time. Suspended from the arch is a bell, formed of the shell of the Dolape palm-nut, against which every animal must strike either its horns or back, on entrance.