It would be difficult to guess the detective's thoughts. Was this conviction shaken by Phileas Fogg's return, or did he still regard him as an exceedingly shrewd rascal, who, his journey round the world completed, would think himself absolutely safe in England? Perhaps Fix's opinion of Phileas Fogg was somewhat modified, but he was nevertheless resolved to do his duty, and to hasten the return of the whole party to England as much as possible. At eight o'clock the sledge was ready to start. The passengers took their places on it, and wrapped themselves up closely in their traveling-cloaks. The two great sails were hoisted, and under the pressure of the wind the sledge slid over the hardened snow with a velocity of forty miles an hour. The distance between Fort Kearney and Omaha, as the birds fly, is at most two hundred miles. If the wind held good, the distance might be covered in five hours. If no accident happened the sledge might reach Omaha by one o'clock. What a journey! The travelers, huddled close together, could not speak for the cold, intensified by the rapidity at which they were going. The sledge sped on as lightly as a boat over the waves. When the breeze came skimming the earth the sledge seemed to be lifted off the ground by its sails. Mudge, who was at the rudder, kept in a straight line, and by a turn of his hand checked the lurches which the vehicle had a tendency to make. All the sails were up, and the jib was so arranged as not to screen the brigantine. A top-mast was hoisted, and another jib, held out to the wind, added its force to the other sails. Although the speed could not be exactly estimated, the sledge could not be going at less than forty miles an hour. "If nothing breaks," said Mudge, "we shall get there!" Mr. Fogg had made it Mudge's interest to reach Omaha within the time agreed on by the offer of a handsome reward. The prairie, across which the sledge was moving in a straight line, was as flat as a sea. It seemed like a vast frozen lake. The railroad which ran through this section ascended from the southwest to the northwest by Great Island, Columbus, an important Nebraska town, Schuyler and Fremont, to Omaha. It followed throughout the right bank of the Platte River. The sledge, shortening this route, took a chord of the arc described by the railway. Mudge was not afraid of being stopped by the Platte River, because it was frozen. The road, then, was quite clear of obstacles, and Phileas Fogg had but two things to fear--an accident to the sledge, and a change or calm in the wind. But the breeze, far from lessening its force, blew as if to bend the mast, which, however, the metallic lashings held firmly. These lashings, like the chords of a stringed instrument, resounded as if vibrated by a violin bow. The sledge slid along in the midst of a plaintively intense melody. "Those chords give the fifth and the octave," said Mr. Fog.