"If the island is shaped like a horseshoe we ought not to have great difficulty in locating it," said Dick. "The trouble is, you cannot see the formation very well from the sea, Dick. If one were in a balloon it would be different. You must remember that there are many hundreds of islands scattered in that part of our globe." "Let's take a balloon along," suggested Tom. "Then we could go up and take a look around." "You couldn't look far enough, Tom, and if you tried to sail in the balloon you'd probably drop into the ocean and be drowned. No, we'll have to do our searching from the steam yacht. But I have several maps and drawings which I think will aid us." "The things Cuffer and Shelley were after?" cried Dick. "Perhaps--if they are in league with Sid Merrick. Merrick, of course, would like to get all the information possible." "I'd like to look at the maps and drawings." "So would I," added Sam and Tom. The idea of going on a treasure hunt filled them with great interest. "The maps and drawings I have are only copies," went on Anderson Rover. "The originals are in Mrs. Stanhope's possession." Mr. Rover turned to his brother. "You have them, Randolph. Will you please get them." "I have them?" queried Randolph Rover, in perplexity. As my old readers know, he was at times somewhat absent-minded. "Why, yes, don't you remember my giving them to you? They were in a large yellow envelope. I think you placed them away with your traction company bonds." "Why--er--so I did," stammered Randolph Rover. "But I--er--I don't quite remember what I did with them." He scratched his head. "I'll go and get my tin box." He left the sitting room, and after being gone fully ten minutes returned with a flat tin box, in which he kept some papers of value. "The envelope doesn't seem to be here," he said, turning over the contents of the box. "Don't you remember it?" asked his brother, anxiously. "Oh, yes, I remember it very well now. I saw it only a couple of days before I went to Carwell with my bonds." "Did you take that tin box to Carwell?" asked Tom. "Yes." "Was the envelope in it then?" "I--er--I really don't know, Thomas. You see I was much upset, thinking my bonds were no good. Perhaps the yellow envelope was in the box, under the bonds." "And did Sid Merrick have hold of the box?" demanded Anderson Rover. "He may have had. The box was on a side table, and he walked around the room and over to it several times." "Then, unless you have the envelope now, Sid Merrick stole it," said Anderson Rover, somewhat bitterly. This announcement filled Randolph Rover with increased anxiety and as a result he looked over all his private papers and ransacked his safe and his desk from end to end. But the precious yellow envelope and its contents were not brought to light. "Merrick must have gotten hold of that envelope at the time he stole the bonds," said Dick. "Maybe that is what made him trace up this story of the treasure."