Upon awaking I ascended the highest point in the wall of the crater, which was almost its southern extremity, and there I found its height by my aneroid to be about 4500 feet above sea level, the angles by my azimuth compass being from Herðubreið 40° west, Skjaldbreið 103° east. From this point the floor of the crater appeared more bent about and upheaved, while many of its gaping fissures seemed much wider than before, doubtless the result of the longitudinal view of them which the position commanded; in fact, each fissure seemed trying to excel its neighbour in making the most horrible noise, while emitting the most nauseous smell. I doubt if even Cologne, in all its former nastiness and “thousand well defined and separate stinks,” could have produced anything so utterly putrid and abominable as the effluvia which were wafted to the summit we were standing upon! At one point it seemed just possible for us to reach the floor of the crater, and as it would save us a considerable detour if we were able to cross it, we packed up and began again to descend a very precipitous slope of pumice. From thence we descended as far as 750 feet, and then found our way barred by the interior rim of precipice before spoken of. Hitherto we had been unable to see its full extent from the overhanging wall of the crater, but from this vantage-ground it seemed to be about 300 feet deep, while the floor appeared to be dark mud: many of the fissures must have been twenty or thirty feet across, and others at least a quarter of a mile in length. I tried to measure the precipice by flinging over a large lump of the heaviest pumice, but it gave no sound as it reached the bottom, for it was so light I could not fling it far enough to see where it struck, hence we were afraid to go to the extreme edge of the precipice on account of the loose and crumbling nature of the rocks. Nothing now remained for us but to climb back again. This was no easy matter, because of the great angle of the slope, so I was compelled to dig my sore toes into the pumice with all my might; and in one place, for a distance of some 200 feet, to dig steps with my ice axe. We reached the summit at last, very warm, but very glad to be at the top instead of at the bottom of those 750 feet, for had we slipped, we should in all probability have fallen to the bottom of the crater. At last we arrived at the plain of Askja by following along the top of cliffs upon the eastern side of the crater, and there we found everything covered with a dark brown loam, which was still falling thickly around us. I next inspected the pit I had noticed in the morning, which was situated by itself at the top of the precipice, and found it about a quarter of a mile in circumference. Upon looking into it, for a long time nothing could be seen but dense clouds of steam and loam which were rising from it with intermittent violence; but after a while a large portion of the margin slipped in, and stopping the steam for a few moments, enabled us to discern a black funnel-shaped pit tapering towards the bottom, from which huge volumes of steam were again beginning to rise; then came a sudden burst of hot steam, loam, and stench, which again compelled us to make a precipitate retreat. I next investigated every part of this side of the crater in order to see if I could by any means descend to the floor of it, but I found the interior precipice extended all round, and at every point prevented my doing so. We therefore camped but a short distance from the pit, that we might be the better able to watch the wonderful and varying manœuvres which from time to time were enacted.