I went on, being eager to satisfy myself on this point, and holding my torch about the level of my head, when all at once I felt the skin of my hand scorched, and, looking up, saw that the flame was burning very low, which had escaped me, so much were my thoughts taken up. I had no mind to pursue this journey in darkness, for though I had come very well to this point, I knew not whereto the tunnel would bring me, nor what perils might be lurking in the way. Accordingly I turned myself about, purposing to acquaint Billy with what I had discovered, and to come again, either with him or alone, with sufficient light to hold out to the end. But I soon saw, to my exceeding discomfort, that I had already presumed too much upon the endurance of my torch, which was flickering lower and lower, and within a little, though I made what haste I could, went out altogether. At this I was mightily vexed, though not alarmed, for the floor of the tunnel was perfectly sound, albeit rough, and I did not look for the least difficulty in making my way back to the cavern. Though not alarmed, I say, I was vexed, for I could not go nearly so fast in the dark, and I began to think that Billy might be a little uneasy at my long absence. As to myself, there was only one thing to trouble about, and that was to keep to the right hand, so that I should not fail of re-entering the passage by which I had come when I arrived at the place where the other passage joined with it. To make sure on this point I felt with my hand along the wall at my right, and found this a help to me for some distance; but by and by I had to leave it, so as to get past some rocks that stood in my way, and in a little while after I returned to it I stumbled clean over another obstacle, hurting my hands and knees, though luckily my head did not strike the ground. [Sidenote: Lost] When I rose up, I could not find the wall at once, the passage here being exceedingly rough with loose rocks and stones. I stumbled on, and now for the first time the thought came into my head, how awful it would be if a man were lost in such an underground passage as this, not at first thinking of this plight as likely to be mine, though soon I did begin to be very uneasy, and indeed I was almost overcome with horror when all of a sudden I thought, "What if there be a perfect network of these passages in the island, and I can never light on the cavern again?" I wished now very heartily that I had let Billy come down to me when he offered it, but there was no use in wishing, so I groped my way onward, having now got my hand upon the wall again.