After this I must have lain down, and resigned myself to despair, that again bound me in its hideous embrace. How long I cannot tell; but its spell was at length broken by a circumstance that once more put my senses on the alert. CHAPTER TWENTY FOUR. TAPPING THE BUTT. I had stretched myself lengthwise in my cell, and was lying upon my right side, with my head resting upon my arm. While thus placed, I felt something pressing against my thigh, as though there was a protuberance on the plank, or some piece of hard material under me. It began to give me pain, and I reached down my hand to remove it, at the same time raising my body so that I might get at it. I was a little surprised on not finding anything, but the next moment I perceived that the hard substance that annoyed me was not upon the planks, but inside the pocket of my trousers! What had I got there? I remembered nothing, and might have supposed it was some fragments of biscuit; but these I had deposited in the pockets of my jacket, and they could not have got down to my trousers. I felt the article from the outside. It was something very hard, and of a longish shape; but I could not think what, for as yet I could remember nothing that I had carried, with the exception of the biscuits and cheese. I had to raise myself up in order to insert my hand into the pocket, and not until I had done so was I made acquainted with the nature of its contents. The hard oblong thing that had thus attracted my attention was the knife given me by the sailor, Waters; and which, having thrust mechanically into my pocket at the moment of receiving it, I had quite forgotten. The discovery caused me no particular emotion at the moment. Simply a thought of the kindness of the sailor as contrasted with the brutality of the mate--just the same thought that passed through my mind at the time the gift was presented. With this reflection I drew forth the knife, and flinging it down beside me, so that it might be out of the way, I lay down on my side as before. But I had scarcely stretched myself, when an idea crossed my mind, that prompted me to start up again, as suddenly as if I had lain down upon red-hot iron. Unlike the latter, however, it was not a feeling of pain that caused this quick movement, but one of pleasure--of joyful hope. It had just occurred to me that with the knife I might make a hole in the side of the cask, and thus reach the water!