At half-past twelve the travellers caught sight for an instant of Fort Halleck, which commands that section; and in a few more hours the Rocky Mountains were crossed.  There was reason to hope, then, that no accident would mark the journey through this difficult country.  The snow had ceased falling, and the air became crisp and cold.  

Large birds, frightened by the locomotive, rose and flew off in the distance. No wild beast appeared on the plain.  It was a desert in its vast nakedness. After a comfortable breakfast, served in the car, Mr. Fogg and his partners had just resumed whist, when a violent whistling was heard,