Post 00051
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Over all the central plateau, which from here seems level, and over the foothills and lower slopes of the mountains, the forests extends like a black uniform bed of weeds, interrupted only by lakes and meadows and small burned spots called parks,—all of them, except the Yellowstone Lake, being mere dots and spangles in general views, made conspicuous by their color and brightness. About eighty-five per cent of the entire area of the park is covered with trees, mostly the indomitable lodge-pole pine (Pinus contorta, var. Murrayana), with a few patches and sprinklings of Douglas spruce, Engelmann spruce, silver fir (Abies lasiocarpa), Pinus flexilis, and a few alders, aspens, and birches. The Douglas spruce is found only on the lowest portions, the silver fir on the highest, and the Engelmann spruce on the dampest places, best defended from fire. Some fine specimens of the flexilis pine are growing on the margins of openings,—wide-branching, sturdy trees, as broad as high, with trunks five feet in diameter, leafy and shady, laden with purple cones and rose-colored flowers. The Engelmann spruce and sub-alpine silver fir are beautiful and notable trees, but as the plateau became drier and fires began to run, they were driven up the mountains, and into the wet spots and islands where we now find them, leaving nearly all the park to the lodge-pole pine, which, though as thin-skinned as they and as easily killed by fire, takes pains to store up its seeds in firmly closed cones, and holds them from three to nine years, so that, let the fire come when it may, it is ready to die and ready to live again in a new generation. For when the killing fires have devoured the leaves and thin resinous bark, many of the cones, only scorched, open as soon as the smoke clears away; the hoarded store of seeds is sown broadcast on the cleared ground, and a new growth immediately springs up triumphant out of the ashes. Therefore, this tree not only holds its ground, but extends its conquests farther after every fire. Thus the evenness and closeness of its growth are accounted for. In one part of the forest that I examined, the growth was about as close as a cane-brake. The trees were from four to eight inches in diameter, one hundred feet high, and one hundred and seventy-five years old. The lower limbs die young and drop off for want of light. Life with these close-planted trees is a race for light, more light, and so they push straight for the sky. Mowing off ten feet from the top of the forest would make it look like a crowded mass of telegraph-poles; for only the sunny tops are leafy. A sapling ten years old, growing in the sunshine, has as many leaves as a crowded tree one or two hundred years old. As fires are multiplied and the mountains become drier, this wonderful lodge-pole pine bids fair to obtain possession of nearly all the forest ground in the West.
How still the woods seem from here, yet how lively a stir the hidden animals are making; digging, gnawing, biting, eyes shining, at work and play, getting food, rearing young, roving through the underbrush, climbing the rocks, wading solitary marshes, tracing the banks of the lakes and streams! Insect swarms are dancing in the sunbeams, burrowing in the ground, diving, swimming,—a cloud of witnesses telling Nature’s joy. The plants are as busy as the animals, every cell in a swirl of enjoyment, humming like a hive, singing the old new song of creation. A few columns and puffs of steam are seen rising above the treetops, some near, but most of them far off, indicating geysers and hot springs, gentle-looking and noiseless as noiseless as downy clouds, softly hinting the reaction going on between the surface and the hot interior. From here you see them better than when you are standing beside them, frightened and confused, regarding them as lawless cataclysms. The shocks and out-bursts of earthquakes, volcanoes, geysers, storms, the pounding of waves, the uprush of sap in plants, each and all tell the orderly love-beats of Nature’s heart.
Turning to the eastward, you have the Grand Cañon and reaches of the river in full view; and yonder to the southward lies the great lake, the largest and most important of all the high fountains of the Missouri-Mississippi, and the last to be discovered.