We emerged from the cave to observe in front of us the cause of the intense heat which had been so oppressive while we were in it. A white cloud of smoke rose from the funnel-like hollow, and occasionally flickering red flames shot up and turned this to the same hue, while at times the cloud wore a blue colour, matching the changing tints of the lake of fire below. Round the interior of the great crater in which we were ran a rugged path of broken masses of rock, between which streams of lava lay, and over them we had to pass. Even as we went along, scarcely able to breathe, we saw a huge fragment of rock crash down into the depths below. This was followed by a grinding sound and a rumble like thunder; then high above us shot a shower of red-hot lava and stones, while we crouched under a projecting shelf of black basalt, and forgot that we were prisoners in the midst of such an impressive scene. When the stream of fire which darted upwards had somewhat subsided, our captives urged us forward, and on we went, tumbling and slipping over the dangerous rocks, which threatened every instant to give way beneath our feet. Even the savages became exceedingly cautious as we wound our way around the crater, and seemed to be getting nearer and nearer still to the molten fire below. [Illustration: "HE FELL HEAD FIRST."] As he turned round for a moment to see if we were following, the foremost of our captors missed his footing, and, bound as we were, none of us could make an attempt to save him. Uttering an appalling cry of horror, he fell head first into the roaring furnace! We flung ourselves upon our faces and tried to shut out that weird scream of terror; then Denviers, prone as he was, worked his body forward upon a loose, overhanging rock, and stared down into the red sea of fire below. "The sahib is mad! Come back, come back!" cried Hassan, excitedly; whereupon the savages, looking more like demons than men, as their faces were lighted up by the glow of the lambent flames, seized hold of my companion and dragged him from threatening death. "He has not fallen right in," said Denviers to me, calmly, as though his own danger had been a mere nothing; "the man is clinging to a projecting crag just above the flames. Hassan," he cried to our guide, "tell these savages if they will unbind me I think I can save him."