But the lava which forms your precarious foothold, melted, perhaps, a hundred times, can not be handled or trusted, and the heat even there is so great as to burn the skin of one's face, although the heated air, as it rises, is instantly swept off to the leeward by the wind. It is always hazardous, not to say fool-hardy, to stand there for a moment, lest your uncertain foothold, crumbling and crispy by the action of fire, shall suddenly give way and throw you instantly into the fiery embrace of death. At times, too, the caldron is so furiously boiling, and splashing, and spitting its fires, and casting up its salient, angry jets of melted lava and spume, that all approach to it is forbidden. We slumped several times near it, as a man will in the spring who is walking over a river of which the ice is beginning to thaw, and the upper stratum, made of frozen snow, is dissolved and rotten. A wary native who accompanied us wondered at our daring, and would not be kept once from pulling me back, as with the eager and bold curiosity of a discoverer, all absorbed in the view of such exciting wonders, I was getting too near. At the time we viewed it, the brim all round was covered with splashes and spray to the width of ten or twelve feet. The surface of the lake was about a mile in its longest diameter, at a depth of thirty or forty feet from its brim, and agitated more or less all over, in some places throwing up great jets and spouts of fiery red lava, in other places spitting it out like steam from an escape-pipe when the valves are half lifted, and again squirting the molten rock as from a pop-gun. The surface was like a river or lake when the ice is _going out_ and broken up into cakes, over which you will sometimes see the water running, and sometimes it will be quite hidden. In the same manner in this lake of fire, while its surface was generally covered with a crust of half-congealed, dusky lava, and raised into elevations, or sunk into depressions, you would now and then see the live coal-red stream running along. Two cakes of lava, also, would meet like cakes of ice, and their edges crushing, would pile up and fall over, precisely like the phenomena of moving fields of ice; there was, too, the same rustling, grinding noise. Sometimes, I am told, the roar of the fiery surges is like the heavy beating of surf. Once, when Mr. Coan visited it, this caldron was heaped up in the middle, higher above its brim than his head, so that he ran up and thrust in a pyrometer, while streams were running off on different sides. At another time when he saw it, it had sunk four or five hundred feet below its brim, and he had to look down a dreadful gulf to see its fires.