The northern Somali have no permanent villages in the interior of the country, as the ground is not cultivated; but they scatter about, constantly moving with their flocks and herds to any place within their limited districts where water is to be found, and erect temporary huts of sticks, covered with grass mats; or, when favourable, they throw up loose stone walls like the dykes in Scotland. But on the sea-coast, wherever there are harbours for shipping, they build permanent villages on a very primitive scale. These are composed of square mat walls, supported by sticks, and all huddled together, and partitioned off for the accommodation of the various families, near which there are usually one or more square box-shaped stone buildings, the property of the chief of the place, which are designated forts, though there is nothing in their artless construction to deserve this name. They are all composed of blocks of coralline, cemented together with mortar extracted from the same material. Like nearly all places within the tropics, beyond the equatorial rainy zone, this country is visited by regular monsoons, or seasons in which the winds prevail constantly in one direction; consequently vessels can only come into the harbours of the northern coast when the sun is in the south, or during five months of the year, from the 15th November to the 15th April, to trade with the people; and then the Somali bring the products of their country, such as sheep, cows, ghee, mats made by the women from certain grasses and the Daum palm, ostrich feathers, and hides, and settle on the coast to exchange them in barter with the outer merchants, such as Arabs and men from Cutch, who bring thither cloths, dates, rice, beads, and iron for that purpose. Of all the trading places on the coast, the most important is Berbera; it is, in fact, the great emporium of Somali land, and we must call the reader's particular attention to it, since it forms the chief point of interest in these pages. It is on the same meridian as Aden, and only divided from it by the gulf of that name. Although it is of such great importance, it is only inhabited during the five months of the favourable monsoon, when great caravans come up from the rich provinces which lie to its south and south-west, the principal ones being those from Ugahden and Harar.