On you go, winding on down past the red limestone and the yellow limestone and the blue sandstone, which is green generally; past huge bat caves and the big nests of pack-rats, tucked under shelves of Nature's making; past stratified millions of crumbling seashells that tell to geologists the tale of the salt-water ocean that once on a time, when the world was young and callow, filled this hole brim full; and presently, when you have begun to piece together the tattered fringes of your nerves, you realize that the canyon is even more wonderful when viewed from within than it is when viewed from without. Also, you begin to notice now that it is most extensively autographed. Apparently about every other person who came this way remarked to himself that this canyon was practically completed and only needed his signature as collaborator to round it out--so he signed it and after that it was a finished job. Some of them brought down colored chalk and stencils, and marking pots, and paints and brushes, and cold chisels to work with, which must have been a lot of trouble, but was worth it--it does add so greatly to the beauty of the Grand Canon to find it spangled over with such names as you could hear paged in almost any dollar-a-day American-plan hotel. The guide pointed out a spot where one of these inspired authors climbed high up the face of a white cliff and, clinging there, carved out in letters a foot long his name; and it was one of those names that, inscribed upon a register, would instinctively cause any room clerk to reach for the key to an inside one, without bath. I regret to state that nothing happened to this person. He got down safe and sound; it was a great pity, too. By the Bright Angel Trail it is three hours on a mule to the plateau, where there are green summery things growing even in midwinter, and where the temperature is almost sultry; and it is an hour or so more to the riverbed, down at the very bottom. When you finally arrive there and look up you do not see how you ever got down, for the trail has magically disappeared; and you feel morally sure you are never going to get back. If your mule were not under you pensively craning his head rearward in an effort to bite your leg off, you would almost be ready to swear the whole thing was an optical illusion, a wondrous dream. Under these circumstances it is not so strange that some travelers who have been game enough until now suddenly weaken. Their nerves capsize and the grit runs out of them like sand out of an overturned pail.