It is needless to say that the topic of conversation with every one on board was Dr. Ferguson’s enterprise. Seeing and hearing the doctor soon inspired everybody with such confidence that, in a very short time, there was no one, excepting the incredulous Scotchman, on the steamer who had the least doubt of the perfect feasibility and success of the expedition. During the long, unoccupied hours of the voyage, the doctor held regular sittings, with lectures on geographical science, in the officers’ mess-room. These young men felt an intense interest in the discoveries made during the last forty years in Africa; and the doctor related to them the explorations of Barth, Burton, Speke, and Grant, and depicted the wonders of this vast, mysterious country, now thrown open on all sides to the investigations of science. On the north, the young Duveyrier was exploring Sahara, and bringing the chiefs of the Touaregs to Paris. Under the inspiration of the French Government, two expeditions were preparing, which, descending from the north, and coming from the west, would cross each other at Timbuctoo. In the south, the indefatigable Livingstone was still advancing toward the equator; and, since March, 1862, he had, in company with Mackenzie, ascended the river Rovoonia. The nineteenth century would, assuredly, not pass, contended the doctor, without Africa having been compelled to surrender the secrets she has kept locked up in her bosom for six thousand years. But the interest of Dr. Ferguson’s hearers was excited to the highest pitch when he made known to them, in detail, the preparations for his own journey. They took pleasure in verifying his calculations; they discussed them; and the doctor frankly took part in the discussion. As a general thing, they were surprised at the limited quantity of provision that he took with him; and one day one of the officers questioned him on that subject. “That peculiar point astonishes you, does it?” said Ferguson. “It does, indeed.” “But how long do you think my trip is going to last? Whole months? If so, you are greatly mistaken. Were it to be a long one, we should be lost; we should never get back. But you must know that the distance from Zanzibar to the coast of Senegal is only thirty-five hundred—say four thousand miles. Well, at the rate of two hundred and forty miles every twelve hours, which does not come near the rapidity of our railroad trains, by travelling day and night, it would take only seven days to cross Africa!” “But then you could see nothing, make no geographical observations, or reconnoitre the face of the country.” “Ah!” replied the doctor, “if I am master of my balloon—if I can ascend and descend at will, I shall stop when I please, especially when too violent currents of air threaten to carry me out of my way with them.” “And you will encounter such,” said Captain Bennet. “There are tornadoes that sweep at the rate of more than two hundred and forty miles per hour.”