"The military part of the expedition comprised about sixteen hundred soldiers, with two batteries of artillery; but so many of the soldiers were found unfit for duty, that half of them were sent back or left behind at Khartoum. Baker finally selected forty men to serve as a body-guard, and they proved to be excellent soldiers, and of more use than all the rest that had been sent to serve him. This small force of picked men was known as 'The Forty.' They were not of the best character, and some of their performances when off duty caused them to be called 'The Forty Thieves' by the English-speaking members of the expedition. "It was expected that there would be much opposition among the merchants of Khartoum when they learned the object for which Baker Pacha had been sent to the Soudan. Of course it would not do for them to declare open hostility, but they could hinder the enterprise in various ways. When Baker arrived at Khartoum he found that the traders had sent away all the boatmen, as they knew the expedition could not move without boats. The police and military were employed to hunt them up, and of course much valuable time was lost in so doing. "When they finally got away from Khartoum they had two steamers and thirty-six sailing-boats. The steamers had each a sailing-boat in tow, and on one of these boats was the commander of the expedition, accompanied by his wife, Lady Baker, and the officers of his staff. "I was with the officers on the other boat, and the two steamers pushed along, with their tows, leaving the sailing craft to follow as fast as they could. We went up what is called the White Nile. Khartoum is at the junction of the Blue and White Nile, the landing-place being on the former stream. The Blue Nile was long supposed to be the principal branch of the river. It was explored by Bruce, who traced it to its source, and thought he had found the spot where the Nile takes its rise." Frank remarked that one of his school-books contained a picture of Bruce standing by the side of a spring not more than a yard across, from which a rivulet was flowing. Fred said he had read something about Bruce, and was sorry he had forgotten exactly what it was. [Illustration: VIEW ON THE BAHR-EL-AZREK.] "Perhaps I can help you," responded Doctor Bronson. "James Bruce was born at Kinnaird, in Scotland, in 1730, and died there in 1794. He was educated for a lawyer, but never practised his profession. His tastes ran in the direction of Oriental languages and literature, and after studying them for some years he was appointed Consul-general for Algiers. He remained there for two years, and then travelled in Tunis, Tripoli, Palestine, Syria, and Egypt, spending nearly five years in Egypt and Abyssinia in an effort to find the sources of the Nile. The Bahr-el-Azrek, or Blue Nile, was then supposed to be the main stream, and Bruce followed it to its source.