Fortunately I had looked at my watch at the beginning of the hollow sounds, the forerunners of the eruption, for during its continuance I should probably have forgotten to do so. The whole lasted four minutes, of which the greater half must have been taken up by the eruption itself. When this wonderful scene was over, the peasant accompanied me to the basin. We could now approach it and the boiler without danger, and examine both at leisure. There was now nothing to fear; the water had entirely disappeared from the outer basin. We entered it and approached the inner basin, in which the water had sunk seven or eight feet, where it boiled and bubbled fiercely. With a hammer I broke some crust out of the outer as well as out of the inner basin; the former was white, the latter brown. I also tasted the water; it had not an unpleasant taste, and can only contain an inconsiderable proportion of sulphur, as the steam does not even smell of it. I went to the basin of the Geyser every half hour to observe how much time was required to fill it again. After an hour I could still descend into the outer basin; but half an hour later the inner basin was already full, and commenced to overflow. As long as the water only filled the inner basin it boiled violently; but the higher it rose in the outer one, the less it boiled, and nearly ceased when the basin was filled: it only threw little bubbles here and there. After a lapse of two hours--it was just noon--the basin was filled nearly to the brim; and while I stood beside it the water began again to bubble violently, and to emit the hollow sounds. I had scarcely time to retreat, for the pillars of water rose immediately. This time they spouted during the noise, and were more bulky than those of the first explosion, which might proceed from their not rising so high, and therefore remaining more compact. Their height may have been from forty to fifty feet. The basins this time remained nearly as full after the eruption as before. I had now seen two eruptions of the Geyser, and felt amply compensated for my persevering patience and watchfulness. But I was destined to be more fortunate, and to experience its explosions in all their variety. The spring spouted again at seven o'clock in the evening, ascended higher than at noon, and brought up some stones, which looked like black spots and points in the white frothy water-column. And during the third night it presented itself under another phase: the water rose in dreadful, quickly-succeeding waves, without throwing rays; the basin overflowed violently, and generated such a mass of steam as is rarely seen. The wind accidentally blew it to the spot where I stood, and it enveloped me so closely that I could scarcely see a few feet off. But I perceived neither smell nor oppression, merely a slight degree of warmth. June 28th.