They had before them a smooth expanse of sand, which on their left was covered, from the summit down, with ice or crystallized snow, forming a great variety of cubic and prismatic figures. Continuing their ascent along the edge of this snow, they heard a noise like distant thunder, and concluding that it was raining somewhere, they proceeded about a league, making frequent halts, being greatly distressed with violent pains in the head and knees, nausea, and difficulty of respiration. They had passed the whole day in absolute solitude; encountering neither plant, bird nor even the least insect. All they saw around them, were fractured rocks, that had undergone fusion, blistered fragments, and heaps of rubbish, sand and ashes. While contemplating these images of destruction, they unexpectedly, about five o'clock P. M., arrived at the border of an immense abyss, throwing up a shower of stones, with a noise similar to that produced by the waves of the sea beating against a wall. Natural emotion and surprise obliged them to recede some paces. Their hair stood on end--their shoulders fell--and they felt a sudden nauseating emptiness of the stomach. Without being able to speak, they could but look at each other, until this sensation of sickness and horror had subsided. They then returned to observe the crater, and examined the barometer, whose mercurial column measured only 15.63 English inches, while the thermometer attached to it was at 39° and the detached one 33° Fahrenheit. They then sat down to contemplate the scene around them, to take notes, and make drawings.