Consulting his chart a moment, Mr. Irwin replied: "Louisville is on our course now, and distant one hundred and eighty-eight miles. We will make it at 14:12." "Now, Irwin, I wish you would explain the mysteries of your castle to Mr. Cobb, and then bring the gentleman to my cabin. You will excuse us a few minutes, will you not, Mr. Cobb? I have some official papers for Mr. Rawolle's inspection. Mr. Lyman, will you come along, too?" to that gentleman. As they left the room, Mr. Irwin turned to Cobb, and held a few minutes' conversation regarding the remarkable experience of the latter; then, rising, he pointed to the right wall and said: "These are instruments used aboard submarine vessels of to-day. There is a thermometer for interior temperature, that for exterior temperature; here are electric dials giving the humidity in various parts of the ship. These dials to the left show the motion of the fans, dynamos, and all other moving machinery aboard. The interior pressure is here noted," placing his hand upon a barometer, "and the exterior, there. The purity of the air is indicated by this little delicate meter. The speed of the vessel is shown on that reel, which is connected, electrically, with the log. These little bells," pointing to twenty-four little bells overhead, "will quickly give warning of the entrance of water into any of the chambers. The equilibrium of the ship is denoted automatically by this alcohol cross combined with a double pendulum. The lipthalene pressure is given here. The many buttons and tubes communicate to all parts of the ship. Those two buttons release the iron weight at the bottom of the vessel, and these twelve buttons regulate the entry and exit of the water in the six water cylinders. The speed is regulated here, and the vessel steered by this little wheel;" and he pointed out the various instruments as he mentioned their uses. Cobb carefully examined every instrument as it was mentioned to him. Turning to Mr. Irwin, he asked: "But where is your steersman--your lookout, I mean? Cooped up in this little room, you can see nothing around the ship. Even on deck, especially in rough weather, you would be too low down to have much of a view of your surroundings." "The explanation is most simple. Look into that box, if you please, and let your head fill the opening, to darken the interior." He smiled as he noted Cobb's perplexed expression. Obeying Mr. Irwin's request, Cobb fitted his face to the opening and gazed inside the box. He saw the sea rising and falling in its swell, vessels passing in various directions, the faint blue outlines of the shore to the northwest, and--click, the scene changes: now other vessels in view, and a clear circle of the horizon, denoting a great expanse of water. Again a clicking sound, and-- "My God!" he cried, starting back; "a ship! a ship is almost upon us!"