“Where has it gone?” I eagerly inquired.
“Stand back!” shouted the guide, “she’s coming.”
[Illustration: “A CLOUD-BURST OF JEWELS.”]
I ran back a few steps, then turned and caught my breath; for at that very instant, up from the pool which I had just beheld so beautiful and tranquil, there rose in one great outburst of sublimity such a stupendous mass of water as I had never imagined possible in a vertical form. I knew that it was boiling, and that a deluge of those scalding drops would probably mean death, but I was powerless to move. Amazement and delight enchained me spellbound. Talk of a fountain! This was a cloud-burst of the rarest jewels which, till that moment, had been held in solution in a subterranean cavern, but which had suddenly crystallized into a million radiant forms on thus emerging into light and air. The sun was shining through the glittering mass; and myriads of diamonds, moonstones, pearls, and opals mingled in splendid rivalry two hundred feet above our heads.
[Illustration: THE OBLONG GEYSER.]
We soon approached another of the many geysers in the basin. They are all different. Around one, a number of colored blocks, exquisitely decorated by the geyser’s waves, appeared to have been placed artistically in an oblong frame. When I first beheld them, they looked like huge sea-monsters which, startled by our footsteps, were about to plunge into the depths.
What is there in the natural world so fascinating and mysterious as a geyser? What, for example, is the depth of its intensely-colored pool of boiling water? No one can tell. One thing, however, is certain; the surface of the pool is but the summit of a liquid column. Its base is in a subterranean reservoir. Into that reservoir there flows a volume of cold water, furnished by the rain or snow, or by infiltration from some lake, or river. Meantime, the walls of the deep reservoir are heated by volcanic fire. Accordingly the water, in contact with these walls, soon begins to boil, and a great mass of steam collects above it. There must, of course, be some escape for this, and, finally, it makes its exit, hurling the boiling water to a height of one or two hundred feet, according to the force of the explosion. Imagine, then, the amount of water that even one such reservoir contains; for some of these volcanic fountains play for more than half an hour before their contents are discharged! Think, also, that in this basin there are no less than thirty geysers, seventeen of which have been observed in action simultaneously.
[Illustration: THE GIANT GEYSER.]
[Illustration: THE CASTLE GEYSER.]
Thus far we had seen merely geysers which arise from pools; but, presently, we approached one which in the course of ages has built up for itself a cone, or funnel, for its scalding waves.
“That,” said our guide, “is the Castle Geyser.”
“That rock a geyser!” I exclaimed incredulously, “it looks like an old ruin, without a single indication of activity; save, possibly, the little cloud of steam that hangs above it, as if it were the breath of some mysterious monster sleeping far below.”