that ice had polished its walls, and I estimated for her the ages since the Merced River flowed at the level of the cataract's brink.

"I've seen the tallest building in the world," she replied dreamily, "and the longest railroad, and the largest lake, and the highest monument, and the biggest department store, and now I see the highest waterfall. Just think of it!"

If one has illusions concerning the average tourist, let him compare the hundreds who gape at the paint pots and geysers of Yellowstone with the dozens who exult in the sublimated glory of the colorful canyon. Or let him listen to the table-talk of a party returned from Crater Lake. Or let him recall the statistical superlatives which made up his friend's last letter from the Grand Canyon.

I am not condemning wonder, which, in its place, is a legitimate and pleasurable emotion. As a condiment to sharpen and accent an abounding sense of beauty it has real and abiding value.

Love of beauty is practically a universal passion. It is that which lures millions into the fields, valleys, woods, and mountains on every holiday, which crowds our ocean lanes and railroads. The fact that few of these rejoicing millions are aware of their own motive, and that, strangely enough, a few even would be ashamed to make the admission if they became aware of it, has nothing to do with the fact. It's a wise man that knows his own motives. The fact that still fewer, whether aware or not of the reason of their happiness, are capable of making the least expression of it, also has nothing to do with the fact. The tourist woman whom I met at the foot of Yosemite Falls may have felt secretly suffocated by the filmy grandeur of the incomparable spectacle, notwithstanding that she was conscious of no higher emotion than the cheap wonder of a superlative. The Grand Canyon's rim is the stillest crowded place I know. I've stood among a hundred people on a precipice and heard the whir of a bird's wings in the abyss. Probably the majority of those silent gazers were suffering something akin to pain at their inability to give vent to the emotions bursting within them.

I believe that the statement can not be successfully challenged that, as a people, our enjoyment of scenery is almost wholly emotional. Love of beauty spiced by wonder is the equipment for enjoyment of the average intelligent traveller of to-day. Now add to this a more or less equal part of the intellectual pleasure of comprehension and you have the equipment of the average intelligent traveller of to-morrow. To hasten this to-morrow is one of the several objects of this book.

To see in the carved and colorful depths of the Grand Canyon not only the stupendous abyss whose terrible beauty grips the soul, but also to-day's chapter in a thrilling story of creation whose beginning lay untold centuries back in the ages, whose scene covers three hundred thousand square miles of our wonderful southwest, whose actors include the greatest forces of nature, whose tremendous episodes shame the imagination of Doré, and whose logical end invites suggestions before which finite minds shrink—this is to come into the presence of the great spectacle properly equipped for its enjoyment. But how many who see the Grand Canyon get more out of it than merely the beauty that grips the soul?

So it is throughout the world of scenery. The geologic story written on the cliffs of Crater Lake is more stupendous even than the glory of its indigo bowl. The war of titanic forces described in simple language on the rocks of Glacier National Park is unexcelled in sublimity in the history of mankind. The story of Yellowstone's making multiplies many times the thrill occasioned by its world-famed spectacle. Even the simplest and smallest rock details often tell thrilling incidents of prehistoric tunes out of which the enlightened imagination reconstructs the romances and the tragedies of earth's earlier days.

How eloquent, for example, was the small, water-worn fragment of dull coal we found on the limestone slope of one of Glacier's mountains! Impossible companionship! The one the product of forest, the other of submerged depths. Instantly I glimpsed the distant age when thousands of feet above the very spot upon which I stood, but then at sea level, bloomed a Cretaceous forest, whose broken trunks and matted foliage decayed in bogs where they slowly turned to coal; coal which, exposed and disintegrated during intervening ages, has long since—all but a few small fragments like this—washed into the headwaters of the Saskatchewan to merge eventually in the muds of Hudson Bay. And then, still dreaming, my mind leaped millions of years still further back to lake bottoms where, ten thousand feet below the spot on which I stood, gathered the pre-Cambrian ooze which later hardened to this very limestone. From ooze a score of thousand feet, a hundred million years, to coal! And both lie here together now in my palm! Filled thus with visions of a perspective beyond human comprehension, with what multiplied intensity of interest I now returned to the noble view from Gable Mountain!

In pleading for a higher understanding of Nature's method and accomplishment as a precedent to study and observation of our national parks, I seek enormously to enrich the enjoyment not only of these supreme examples but of all examples of world making. The same readings which will prepare you to enjoy to the full the message of our national parks will invest your neighborhood hills at home, your creek and river and prairie, your vacation valleys, the landscape through your car window, even your wayside ditch, with living interest. I invite you to a new and fascinating earth, an earth interesting, vital, personal, beloved, because at last known and understood!

It requires no great study to know and understand the earth well enough for such purpose as this. One does not have to dim his eyes with acres of maps, or become a plodding geologist, or learn to distinguish schists from granites, or to classify plants by table, or to call wild geese and marmots by their Latin names. It is true that geography, geology, physiography, mineralogy, botany and zoology must each contribute their share toward the condition of intelligence which will enable you to realize appreciation of Nature's amazing earth, but the share of each is so small that the problem will be solved, not by exhaustive study, but by the selection of essential parts. Two or three popular books which interpret natural science in perspective should pleasurably accomplish your purpose. But once begun, I predict that few will fail to carry certain subjects beyond the mere essentials, while some will enter for life into a land of new delights.

Let us, for illustration, consider for a moment the making of America. The earth, composed of countless aggregations of matter drawn together from the skies, whirled into a globe, settled into a solid mass surrounded by an atmosphere carrying water like a sponge, has reached the stage of development when land and sea have divided the surface between them, and successions of heat and frost, snow, ice, rain, and flood, are busy with their ceaseless carving of the land. Already mountains are wearing down and sea bottoms are building up with their refuse. Sediments carried by the rivers are depositing in strata, which some day will harden into rock.

We are looking now at the close of the era which geologists call Archean, because it is ancient beyond knowledge. A few of its rocks are known, but not well enough for many definite conclusions. All the earth's vast mysterious past is lumped under this title.

The definite history of the earth begins with the close of the dim Archean era. It is the lapse from then till now, a few hundred million