had left the purple domes, downy and white with new-laid snow.  In passing, these monstrous rags of cloud hung low and swept along right over the spectator’s head, swinging their tatters so nearly in his face that his impulse was to shrink when they came closet.  In the one place I speak of, one could look below him upon a world of diminishing crags and canyons leading down, down, and away to a vague plain with a thread in it which was a road, and bunches of feathers in it which were trees,—­a pretty picture sleeping in the sunlight—­but with a darkness stealing over it and glooming its features deeper and deeper under the frown of a coming storm; and then, while no film or shadow marred the noon brightness of his high perch, he could watch the tempest break forth down there and see the lightnings leap from crag to crag and the sheeted rain drive along the canyon-sides, and hear the thunders peal and crash and roar.  We had this spectacle; a familiar one to many, but to us a novelty.

We bowled along cheerily, and presently, at the very summit (though it had been all summit to us, and all equally level, for half an hour or more), we came to a spring which spent its water through two outlets and sent it in opposite directions.  The conductor said that one of those streams which we were looking at, was just starting on a journey westward to the Gulf of California and the Pacific Ocean, through hundreds and even thousands of miles of desert solitudes.  He said that the other was just leaving its home among the snow-peaks on a similar journey eastward —­and we knew that long after we should have forgotten the simple rivulet it would still be plodding its patient way down the mountain sides, and canyon-beds, and between the banks of the Yellowstone; and by and by would join the broad Missouri and flow through unknown plains and deserts and unvisited wildernesses; and add a long and troubled pilgrimage among snags and wrecks and sandbars; and enter the Mississippi, touch the wharves of St. Louis and still drift on, traversing shoals and rocky channels, then endless chains of bottomless and ample bends, walled with unbroken forests, then mysterious byways and secret passages among woody islands, then the chained bends again, bordered with wide levels of shining sugar-cane in place of the sombre forests; then by New Orleans and still other chains of bends—­and finally, after two long months of daily and nightly harassment, excitement, enjoyment, adventure, and awful peril of parched throats, pumps and evaporation, pass the Gulf and enter into its rest upon the bosom of the tropic sea, never to look upon its snow-peaks again or regret them.

I freighted a leaf with a mental message for the friends at home, and dropped it in the stream.  But I put no stamp on it and it was held for postage somewhere.

On the summit we overtook an emigrant train of many wagons, many tired men and women, and many a disgusted sheep and cow.