The appropriate designation of the Rocky Mountain-system is that of a chain. On crossing one of its basins or plateaux, the traveller finds himself within a link such as has just been described. A break in one of these links is called a "pass," or "canon." As he passes through this break he enters another link, belonging to another parallel either of a higher or lower series. In some of the minor plateaux between the snowy ridges no vegetation appears. Granite and sandstone rocks outcrop even in the general sandy level, rising bare and perpendicularly from 50 to 300 feet; as a late traveller describes it, "looking like a mere clean skeleton of the world." Nothing is visible but pure rock on every side. Vast stones lie heaped up into pyramids, as if they had been rent from the sky. Cubical masses, each covering an acre of surface, and reaching to a perpendicular height of thirty or forty feet, suggest the buttresses of some gigantic palace, whose superstructure has crumbled away with the race of its Titanic builders. It is these regions especially which have given the mighty range the appropriate name of the _Rocky Mountains_. THE SAGE COCK. In some spots, the limitless wastes are covered by a scrubby plant known as mountain sage. It rises from a tough gnarled root in a number of spiral shoots, which finally form a single trunk, varying in circumference from six inches to two feet. The leaves are grey, with a strong offensive smell resembling true sage. In other places there appear mixed with it the equally scrubby but somewhat greener grease-wood--the two resinous shrubs affording the only fuel on which the emigrant can rely while following the Rocky Mountain trail.