"I have no doubt that Nick stole the four thousand dollars the messenger laid on the counter, and resorted to the trick of forging a letter to Captain Blastblow, so that he could get the Islander off ahead of the Sylvania," I continued. "But how is it that Cornwood did not stop the Islander at Key West, as it appears he got on board of her there?" asked Colonel Shepard, deeply interested in the narrative. "I think you will have to ask Cornwood about that," I replied. "I am a Yankee, and I can guess what he meant." "I don't know that I care about any guessing, Captain Alick; but if you have any theory with a base under it, I should like to hear it," said Colonel Shepard. "I think Cornwood was well assured that Nick was on board of the Islander when you sent him to intercept the steamer at Key West," I answered. "Cornwood would not have gone on such a wild-goose chase for nothing. According to the testimony of Captain Cayo, Cornwood and Nick had very earnest conversation at Key West." "I don't think it's any use to speculate over the case," interposed Captain Blastblow. "Let us search for the money." We all agreed that this was the next thing to do. CHAPTER XIX. A SEARCH FOR THE LOST TREASURE. The two steamers had passed the bend of the river, and we had gone by forts Jackson and St. Philip without a word being said of the historical events which were connected with them. We were too busy with the inquiry before us to give any attention to the surroundings, though I could see that our passengers on board the Sylvania were discussing what they saw on the mighty river. But nothing could have been more uninteresting than the banks of the river near its delta. It was a season of high water, and the low lands beyond the levee on either side were overflowed. Occasionally we passed a vessel going down the stream, or a powerful skeleton-tug dragging a ship against the rapid current. There was little to be seen besides the muddy flow of the stream all around us, and the fringe of trees that grew on the levee. If the theory we had advanced, and supported by such evidence as we had, was correct, the four thousand dollars the bank messenger had lost were on board the Islander. If Nick had taken the package, he had not left it behind him when he started out on his travels. We went down into the after-cabin. The captain said Nick had occupied the large state-room on the starboard side, while Cornwood had taken possession of the corresponding one on the port side. We found enough of the effects of each in his state-room to settle the question of his occupancy of the room. Four thousand dollars was a large sum of money, and we did not expect to find it lying around loosely in the room of either.