The anxiety of the two boys for the safety of their missing comrades was not relieved when later in the afternoon a lake boat changing its course approached the place where they were lying. Evidently they had been discovered by the captain, who was still holding his glasses in his hand as the boat drew near. "I found a megaphone under the seat," suggested Grant. "Where is it? Go get it," suggested George. In a moment Grant was again on deck and handed the megaphone to Mr. Button. "Ahoy, there!" he called. "Will you give us a tow?" "Who are you?" came back the answer from the deck of the huge boat. "There are three of us and our motor-boat broke down last night." "How long have you been here?" "Why, since midnight anyway. You are the first boat that has come anywhere near us." "And it's just by luck that we saw you. What will you do, come aboard?" "No," answered Mr. Button, "if you'll give us a line we would rather have you tow us. Are you going anywhere near Mackinac Island?" "Yes," answered the captain. "We're bound straight for there. I don't know that we shall stop, but we'll fix it so that you can get ashore if you want to." "That will do splendidly," called Mr. Button. In a brief time the two boats were near enough to enable a sailor to cast a rope to the _Gadabout_. After one or two attempts this was successfully seized and then made fast. As the lake boat swung around to resume its course, the _Gadabout_, one hundred feet or more astern, followed. "I hate to go back and leave the other fellows out here," said George when they began to move swiftly over the waters. "You don't need to worry about them," said Mr. Button. "If we could see them anywhere that would be one thing, but they have disappeared from sight. They have a good skiff and I think I heard you say that they both were Go Ahead Boys. If they are, they will get out of their trouble all right." "I'm sure I hope so," said George dubiously. The conversation, however, ceased, and for a time all three were silent. The clear waters of Lake Huron bubbled and seethed as they were cut by the bow of the swift little motor-boat. The huge lake boat evidently was not carrying a load and its speed accordingly was unhampered. Doubtless the giant boat was returning to Duluth for another cargo of wheat or iron. The progress was uninterrupted so that by the middle of the afternoon the high, rocky shores of Mackinac Island became visible in the distance. At that moment the captain appeared at the stern of the lake boat and raising his megaphone to his mouth, called, "Do you want us to land you?" "No," replied Mr. Button also speaking through a megaphone, "we'll find somebody that will take us in. If you're not going to land there you needn't stop on our account. How much do we owe you?" "You don't owe us anything," called the captain. "We're glad to lend a hand. Whenever you say the word you can cast off and we'll haul in."