"The efforts of Livingstone, Stanley, and other travellers in Central Africa have done much to throw light on the slave-trade, and to persuade some of the African kings and chiefs to abandon it. The only Europeans who encourage it at all now are the Portuguese traders, who have their stations on the east coast of Africa, and even their support to it is generally given in an underhand way. The most extensive slave-dealers are the Arabs, who are not troubled by any religious scruples on the subject, and find a market for their captives among people of similar belief with themselves. "When we get fairly into Central Africa you will probably see something of the system of slavery; so we'll drop the subject now, and I'll tell you how Baker's expedition was fitted out. "Baker received the rank of Pacha, with absolute authority for four years, from April 1, 1869, and was instructed to subdue the countries lying south of Gondokoro, suppress the slave-trade, and introduce a system of regular commerce; open the great lakes near the equator to navigation, and establish military and commercial posts throughout the captured country. "Baker had already been in Central Africa and travelled in the region of the lakes, and consequently he knew something of the difficulties he would encounter. He made grand preparations, which consumed so much time, and were followed by so many delays, that nearly a year elapsed before he left Khartoum for the south." Fred asked if the expedition went up the Nile by way of Korosko, or by another route. "Part of it went that way," said Abdul, "and the rest by Suakim, on the Red Sea. From Suakim there is a road across the Desert to Berber, in Abyssinia. Berber is on the Nile, and from there the river is navigable to Khartoum. I was with the part of the expedition that ascended the Nile, so that I am familiar with Korosko and the route to Aboo Hamed. Khartoom, at the junction of the Blue and White Nile, was selected as the point of departure, and all the supplies for the expedition were sent there. [Illustration: BAKER'S EXPEDITION CROSSING THE DESERT.] "Everything had to be carried over the Desert, and it was an immense affair, I assure you. Six steamboats were sent from Cairo, and three others for navigating the lakes were brought from England, and carried in sections, so that they could be put together at the points where wanted. The boilers of the steamers were found too heavy to be transported on the backs of camels, and it was necessary to mount them on wheels, to which camels were harnessed. "Hundreds of camels were required for carrying all this material, and when the train was on the march it covered the Desert for miles and miles. It was necessary to have many extra camels, to guard against the breaking down of any of the loaded ones, as the loss of a single piece of a boat or its machinery might render all the rest of little or no use. [Illustration: "THE FORTY THIEVES."]