Then he turned his gaze aft; and encountered the amused scrutiny of a man leaning on a wheel in a little house. The house had big windows, and on top was an iron eagle with spread wings. Two steps led up to a door on each side; and Bobby without hesitation entered one of these doors. The inside of the house he found different from any house he had ever been in before; and possessed of a strange fascination. There was the wheel, with projecting handles to every spoke, and above it, racks containing spyglasses, black pipes, tobacco-tins. At hand projected a speaking-tube like that in the back hall at home, and two or three handles connected with wires. Behind the wheel was a broad leather seat; and clothes on nails; and a chart; and a pilot's licence, of which Bobby understood nothing, but admired the round gold seals. "Well, Bobby, what do you think of it?" asked the man. Bobby had not had time to look at the man. He did so now and liked him. The first thing he noticed was the man's eyes, which were steady and unwavering and as blue as the sky. Then he surveyed in turn gravely his heavy bleached, flaxen moustache; his hard brown cheeks; the round barrel of his blue-clad body; and his short sturdy legs. "Think you'd like to run a tug?" inquired this man. "I don't know," replied Bobby; "what is your name?" "I'm Captain Marsh," replied the man. He glanced out the open door at the group on the wharf. "If they're going up past the bend to-day, they'll have to get a move," he remarked. "Here, Bobby, want to blow the whistle?" He lifted the boy up in the hollow of one arm. "There, that's it; that handle. Pull down on it, and let go." Bobby did so and his little heart almost stopped at the shock of the blast, so loud was it, and so near. "Now again," commanded Captain Marsh. Bobby recovered and obeyed. The passengers began to embark. Captain Marsh watched until the last was safely aboard; then he set Bobby gently to the floor. "If you want to see out, go sit on the bunk back there," he advised. Somebody cast off the lines. Captain Marsh pulled the other handle. A sharp tinkling bell struck somewhere far in the depths of the craft. Immediately Bobby felt beneath him the upheaval and trembling of some mighty force. The wharf seemed to slip back. In another moment at a second tinkle of the bell the tug had gathered headway, and the little boy was watching with delight the sandhills and buildings on one side and the other slipping by in regular succession.