TRAVELS IN ICELAND. 141 is well deserving of notice. At the time when we arrived at it the water was at a considerable height in its bason, and overflowed it in every direction. Soon afterwards were heard a subterraneous rumbling and gentle detonations. This was the signal for the propulsion of the water, which began instantly to rise; but at the period in question it did not attain more than sixty feet. The jet suddenly ceased, and began again at intervals of some minutes. The violence of the spurting diminished by gradations, till the bason became entirely empty. Our guide told us that it was usual to see the Geyser flow with such feebleness and irregu- larity. The bason was for an instant without any water; but the vapours which arose from the crater prevented us Irom seeing the bottom. We measured its depth with a plum-line, and found it to be seventy-two feet: while the diameter of its orifice was about fifty-seven; and that of the bottom, or very little above it, eighteen feet. The bason, by contracting, terminates like a funnel: we therefore again dropped our line, rn the hope that the lead would find some apertures through which the water issues; but no sooner had the ball touched the bottom, than a boiling jet d’etiH was propelled over the rock, though fortunately it did not fall upon us. Not willing to be deterred from our purpose by such an interruption, we again attempted to sound the bason, when another gush obliged us to make a precipitate retreat. The air and manner of our guide on this occasion evidently testified that he was alarmed at what had happened; and that he thought, like ifiost of the common people, that it was not permitted to man to examine such mysterious places, because the powerful spirits who reside in them always punish those who attempt to dive iuto their secrets. We frequently, but iu vain, renewed our attempts to sound this crater, in order to ascertain what holes were at the bottom: but either our ball was too large, it being about two-thirds of an inch in diameter ; or the apertures were sinuous like those of the Hverevalle, which prevented us from gaining our point. After the propulsions already mentioned, the Geyser remained tranquil during the night, the water rose slowly, and the bason was not full till four o’clock in the morning. We remained in the vicinity; that we might not fail to observe the spouting of the water; and in order to ascertain its force, threw into the bason some pebbles and thermal concretions which we found about it. At length the issue of the water was announced by a rumbling noise under our feet, similar to the firing of cannon at a distance. Five reports of this kind succeeded each other, each of which was louder than the preceding, or as if the can- non was approaching towards us; we felt at the same time the ground shake under us as if it wqs about to split or burst.

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