"The pilot keeps a lookout on the paddle box," continued the gentleman, "watching the changes in the channel, and also the movements of the vessels which are coming and going. When he wishes the helm to be put to the right, he calls out _Starboard_! When he wishes it to be put to the left, he calls out _Port_! And when he wishes the ship to go straight forward as she is, he calls out _Steady_!" Just then the pilot, from his lofty lookout on the paddle box, called out, "_Port_!" The officer on the deck repeated the command, in order to pass it along to the helmsman, "_Port_!" The helmsman then repeated it again, by way of making it sure to the officer that he had heard it and was obeying it, "_Port!_" There were two or three dashing-looking young men walking together up and down the dock, and one of them, on hearing these commands, called out, not very loud, but still in such a manner as that all around him could hear, and imitating precisely the tones in which the pilot's order had been given, "_Sherry!_" Whereupon there was a great laugh among all the passengers around. Even the stern and morose-looking countenance of the officer relaxed into a momentary smile. "Now look forward at the bows of the ship," said the gentleman, "and you will see her change her course in obedience to the command of the pilot to port the helm." Rollo did so, and observed the effect with great curiosity and pleasure. "I thought the captain gave orders how to steer the ship," said Rollo. "He does," said the gentleman, "after we get fairly clear of the land. It is the captain's business to navigate the ship across the ocean, but he has nothing to do with directing her when she is going in and out of the harbor." The gentleman then went on to explain that at the entrances of all rivers and harbors there were usually rocks, shoals, sand bars, and other obstructions, some of which were continually shifting their position and character, and making it necessary that they should be studied and known thoroughly by some one who is all the time upon the spot. The men who do this are called pilots. The pilots of each port form a company, and have established rules and regulations for governing all their proceedings. They go out to the mouth of the harbor in small vessels called pilot boats, where they wait, both in sunshine and storm, for ships to come in. When a ship approaches the coast and sees one of these pilot boats, it makes a signal for a pilot to come on board. The pilot boat then sails toward the ship, and when they get near enough they let down a small boat, and row one of the pilots on board the vessel, and he guides the ship in. In the same manner, in going out of port, the pilot guides the ship until they get out into deep water, and then a pilot boat comes up and takes him off the ship. The ship then proceeds to sea, while the pilot boat continues to sail to and fro about the mouth of the harbor, till another ship appears.