annually by thousands, on the roads over Kordofan and Darfur. [Sidenote: MERCHANT SERIBAS.] The merchants of Khartoom, to whom I have alluded, maintain a great number of settlements in districts as near as possible to the present ivory countries, and among peaceful races devoted to agriculture. They have apportioned the territory amongst themselves, and have brought the natives to a condition of vassalage. Under the protection of an armed guard procured from Khartoom, they have established various depôts, undertaken expeditions into the interior, and secured an unmolested transit to and fro. These depôts for ivory, ammunition, barter-goods, and means of subsistence, are villages surrounded by palisades, and are called Seribas.[7] Every Khartoom merchant, in the different districts where he maintains his settlements, is represented by a superintendent and a number of subordinate agents. These agents command the armed men of the country, determine what products the subjected natives must pay by way of impost to support the guards, as well as the number of bearers they must furnish for the distant exploring expeditions; they appoint and displace the local managers; carry on war or strike alliances with the chiefs of the ivory countries, and once a year remit the collected stores to Khartoom. Both the principal districts of the Khartoom ivory trade are accessible by the navigation of the two source-affluents together forming the White Nile, viz. the Bahr-el-Ghazal and the Bahr-el-Gebel. The name Bahr-el-Abiad is understood in Khartoom to include the entire domain of the Nile and its affluents above this town, but in its true and more limited sense it signifies only the united mainstream as far as the mouth of the Sobat, “White Nile.” Two less important centres are approached by the channels of the Sobat and the Giraffe. The landing-places, called Meshera, are in all cases at a distance of some days’ journey from the depôts. The trade winds and the rainy seasons both have their effect in determining the time of year in which progress can be made. They render the passage up stream practicable only from December to January, and limit the valley journey to June, July, and August. On the Bahr-el-Gebel the extreme point of navigation is the well-known Gondokoro in lat 5° N., the termination of a series of voyages of discovery. On the Bahr-el-Ghazal a kind of _cul-de-sac_ leads to the only existing Meshera. Beyond this, the Khartoom people have already advanced 5° in a southerly, as well as in a westerly direction. In the district of the Gazelle River, the Niam-niam countries form a great source of the ivory-produce; of the ways which were available, this was the direction which appeared to promise the best opening for the prosecution of my object. Accordingly, I determined to proceed by the Gazelle, and concluded my contract with the Coptic Ghattas. He engaged to supply the means of subsistence, and