The Big-Tree groves, he says, are growing in the soil-areas off which the ice first melted at the close of the ice age. The wide gaps between the various sequoia groves were areas occupied by the large and long-enduring glaciers. The topography of the mountains plainly shows that the areas where the groves are were places protected from the ice-flows of the heights. The gaps would naturally have received the main ice-flows from the heights.

In the south the Big-Tree forests are in the areas that were effectively buttressed and shielded from ice-flows. Consequently these areas were early opened at the close of the ice age. The forty-mile-wide gap between the Stanislaus and the Tuolumne Groves was a channel filled with a glacier probably long after the groves to the north and the south started to grow.

Did the sequoia endure the long ice age in these few places where the groves are now growing? The pine, fir, spruce, and other forest species in the Sierra may have been planted with seeds from trees that survived in the south. But as the sequoia is found nowhere else, the question arises, did it survive somewhere near the localities in which it is now growing?

An acquaintance with the Big Trees, an understanding of them, gives us one of the most impressive and lasting ties to be had in nature. These trees ever impress one with a nobility of character. Seen at midday, or at early morning when their lengthened shadow gives strange tones to the scene, or in the serene, strange moonlight, or when, wrapped in restless mist, they loom vast and mysterious, or in a storm, they are ever marvelously steadfast and calm. Long may they live!

At the Big Trees, the first act of Horace Greeley, the celebrated editor, was to take out a pencil and figure on the lumber contents of one. These veteran trees have a higher value.

Lincoln, in his lecture on Niagara Falls, said: "The mere physical fact of Niagara Falls is a very small part of the world's wonder. Its power to incite reflection and emotion is its greatest charm." Lincoln might have calculated the mule-power of the Falls if ruined—changed from the higher value of a scenic spectacle to common commercialism. Why tell how many hovels or how many feet of sewer might be constructed out of the Library of Congress; or the number of cobblestones that could be manufactured from the Washington Monument? As well tell the number of forts that might have been built with the marbles and the energy that were put into statuary and the inspiring arts, as to consider or measure Big Trees in lumber terms.

The sequoia is one of the monumental wonders of this round world. It is the oldest settler—the pioneer of pioneers. Each venerable giant numbers his years by centuries. Each was already old when nations of the present were born. Gone and forgotten are the nations that were—gone the flags that waved in the wind when these trees began to cast their shadows.

And it may be—for nations with all their pomp and pride are short-lived—that every flag that now flaunts the sky, that every nation now on earth, will pass out of existence long before these patriarchal trees lie down at last upon the mountains. Some of these trees have already out-lived more than fifty generations of mankind. Some of them are likely to look upon a score or more of passing generations of the human race. These trees might tell a thousand stirring stories to the one possessed by the Sphinx. The Sphinx is of lifeless stone. These trees are alive. They have lived through countless changing scenes. But which shall be accounted the more striking and wonderful, the passing pictures in the centuries they have looked upon, or the moving, changing scenes in the centuries that they are yet to see?

These Big Trees have endured fire, flood, lightning, landslide, gale, drought, and earthquake, but have never hauled down their evergreen banners. They have triumphed over the changes of ten thousand seasons; watched and waved through centuries of sunlight and storm. Countless times the sun has projected a silhouetted shadow of their stupendous plumes against the mountain side. They have worn monumental robes of snow flowers; they have stood silent in the light of thousands of autumn moons; and they are still upon the heights to inspire us with their steadfastness and their splendor.

The landmark and the heritage of the ages are these splendid trees, these immortal evergreens. Their historic lore and unequaled grandeur give them amplitude and poetry enough to kindle and enrich the imagination. Let them live on; they will bless those who make the sacred pilgrimage to see them, and they will be a "choir invisible" to all who simply know that upon the sublime Sierra they still wave grandly.