第14章 III(6)

The woods differ but little from those that clothe the mountains to the southward, the trees being slightly closer together and generally not quite so large, marking the incipient change from the open sunny forests of the Sierra to the dense damp forests of the northern coast, where a squirrel may travel in the branches of the thick-set trees hundreds of miles without touching the ground. Around the upper belt of the forest you may see gaps where the ground has been cleared by avalanches of snow, thousands of tons in weight, which, descending with grand rush and roar, brush the trees from their paths like so many fragile shrubs or grasses.

At first the ascent is very gradual. The mountain begins to leave the plain in slopes scarcely perceptible, measuring from two to three degrees. These are continued by easy gradations mile after mile all the way to the truncated, crumbling summit, where they attain a steepness of twenty to twenty-five degrees. The grand simplicity of these lines is partially interrupted on the north subordinate cone that rises from the side of the main cone about three thousand feet from the summit. This side cone, past which your way to the summit lies, was active after the breaking-up of the main ice-cap of the glacial period, as shown by the comparatively unwasted crater in which it terminates and by streams of fresh-looking, unglaciated lava that radiate from it as a center.

The main summit is about a mile and a half in diameter from southwest to northeast, and is nearly covered with snow and neve, bounded by crumbling peaks and ridges, among which we look in vain for any sure plan of an ancient crater. The extreme summit is situated on the southern end of a narrow ridge that bounds the general summit on the east. Viewed from the north, it appears as an irregular blunt point about ten feet high, and is fast disappearing before the stormy atmospheric action to which it is subjected.

At the base of the eastern ridge, just below the extreme summit, hot sulphurous gases and vapor escape with a hissing, bubbling noise from a fissure in the lava. Some of the many small vents cast up a spray of clear hot water, which falls back repeatedly until wasted in vapor.

The steam and spray seem to be produced simply by melting snow coming in the way of the escaping gases, while the gases are evidently derived from the heated interior of the mountain, and may be regarded as the last feeble expression of the mighty power that lifted the entire mass of the mountain from the volcanic depths far below the surface of the plain.

The view from the summit in clear weather extends to an immense distance in every direction. Southeastward, the low volcanic portion of the Sierra is seen like a map, both flanks as well as the crater-dotted axis, as far as Lassen's Butte[6], a prominent landmark and an old volcano like Shasta, between ten and eleven thousand feet high, and distant about sixty miles. Some of the higher summit peaks near Independence Lake, one hundred and eighty miles away, are at times distinctly visible. Far to the north, in Oregon, the snowy volcanic cones of Mounts Pitt, Jefferson, and the Three Sisters rise in clear relief, like majestic monuments, above the dim dark sea of the northern woods. To the northeast lie the Rhett and Klamath Lakes, the Lava Beds, and a grand display of hill and mountain and gray rocky plains. The Scott, Siskiyou, and Trinity Mountains rise in long, compact waves to the west and southwest, and the valley of the Sacramento and the coast mountains, with their marvelous wealth of woods and waters, are seen; while close around the base of the mountain lie the beautiful Shasta Valley, Strawberry Valley, Huckleberry Valley, and many others, with the headwaters of the Shasta, Sacramento, and McCloud Rivers. Some observers claim to have seen the ocean from the summit of Shasta, but I have not yet been so fortunate.

The Cinder Cone near Lassen's Butte is remarkable as being the scene of the most recent volcanic eruption in the range. It is a symmetrical truncated cone covered with gray cinders and ashes, with a regular crater in which a few pines an inch or two in diameter are growing. It stands between two small lakes which previous to the last eruption, when the cone was built, formed one lake. From near the base of the cone a flood of extremely rough black vesicular lava extends across what was once a portion of the bottom of the lake into the forest of yellow pine.

This lava flow seems to have been poured out during the same eruption that gave birth to the cone, cutting the lake in two, flowing a little way into the woods and overwhelming the trees in its way, the ends of some of the charred trunks still being visible, projecting from beneath the advanced snout of the flow where it came to rest; while the floor of the forest for miles around is so thickly strewn with loose cinders that walking is very fatiguing. The Pitt River Indians tell of a fearful time of darkness, probably due to this eruption, when the sky was filled with falling cinders which, as they thought, threatened every living creature with destruction, and say that when at length the sun appeared through the gloom it was red like blood.

Less recent craters in great numbers dot the adjacent region, some with lakes in their throats, some overgrown with trees, others nearly bare--telling monuments of Nature's mountain fires so often lighted throughout the northern Sierra. And, standing on the top of icy Shasta, the mightiest fire-monument of them all, we can hardly fail to look forward to the blare and glare of its next eruption and wonder whether it is nigh. Elsewhere men have planted gardens and vineyards in the craters of volcanoes quiescent for ages, and almost without warning have been hurled into the sky. More than a thousand years of profound calm have been known to intervene between two violent eruptions. Seventeen centuries intervened between two consecutive eruptions on the island of Ischia. Few volcanoes continue permanently in eruption. Like gigantic geysers, spouting hot stone instead of hot water, they work and sleep, and we have no sure means of knowing whether they are only sleeping or dead.