Jack started and gazed at it with surprise. He had evidently not known that we were in the neighbourhood of land. A dense fog-bank had concealed it from us. Now that it cleared away it revealed to our gaze a stretch of yellow sand, backed by the lofty blue hills of the interior, and from the palm-trees that I could make out distinctly I judged that we must have been making for the tropical regions during the last three weeks. Yet here again mystery surrounded me. How was it possible that we should have reached the tropics in so short a time? While I was puzzling over this question, the greatest mystery of all occurred to us. If I were not conscientiously relating events exactly as they occurred, I should expect my readers to doubt my veracity here. As we were sailing smoothly along, our ship, without any apparent cause, began to sink. She went down gradually, but quickly--inch by inch-- until the water was on a level with the decks. We struck no rock! we did not cease to advance towards the shore! I fancied that we must certainly have sprung a leak; but there had been no sound of a plank starting, and there was no noise of water rushing into the hold. I could not imagine what had occurred, but I had not much time for thought. We could do nothing to avert the catastrophe. It occurred so suddenly that we were both rendered mute and helpless. We stood gazing at the water as it crept over the deck without making the slightest effort to save ourselves. At length the water reached the hatchway and poured in a roaring cataract into the hold. The vessel filled, gave a heavy lurch to port, a species of tremor passed through her frame as if she was a living thing and knew that her hour had come, then she went down in a whirlpool, leaving Jack and me struggling in the sea. We were both good swimmers, so that we did not experience much alarm, especially when we felt that the sea was comparatively warm; we struck out for the shore, and, being the better swimmer of the two, I took the lead. But now to our horror we found that we were followed by sharks! No sooner did we observe this than we struck out with all the energy of terror. We never swam as we did on that occasion. It seemed to me quite miraculous. The water burst from our breasts in foam, and we left long white tracks behind us as we clove our way through the water like two boats. It was awful. I shall never forget my feelings on that occasion: they were indescribable--inconceivable! We were about a quarter of a mile from a point of rocks when our ship sank. In an incredibly short space of time we were close on the rocks. Being several yards ahead of Jack, I was the first to clamber up, my heart fluttering with fear, yet filled with deep gratitude for my deliverance. I turned to help Jack. He was yet six yards from shore, when a dreadful shark made a rush at him. "Oh! quick! quick!" I screamed.