them on shipboard."

"Then a little instruction will be of service to you and to all of us," said the captain. "I noticed that you were sweeping the sea to the rear. That is not necessary, for at our speed a torpedo boat would not be able to catch us. All your time should be devoted to scanning that quadrant from straight ahead to a point but a little astern of your left quarter, as it is from that section, and the corresponding section on the right side of the vessel that we expect the enemy; do you understand what I mean?"

"I think so," replied Ralph. "But suppose a submarine should be well ahead of us and submerge, and then wait until we have passed. In that case couldn't it again come up and send a torpedo into the stern of the ship?"

"That might be possible, but not probable. A submarine is absolutely in the dark when completely submerged," said the captain. "It must come to the surface sufficiently near to bring its periscope out of the water, and that would reveal its presence to us. It would be a pretty hard job for a navigator in a submarine to calculate when the boat had passed sufficiently near to know the opportune time to come to the surface and give us the shot."

"But couldn't they come near enough to take a chance? They might come up 500 feet away or 2,000. At either distance they could land a torpedo, couldn't they?" asked Alfred.

"Quite true; but the submarine might not know whether we were armed or not, and it would not take the risk of exposure in that reckless manner," replied the captain.

"But we are not armed, are we?" asked Ralph.

"No; our guns will be ready for us on the return trip," answered the captain. After a moment he continued: "Let me also give you a hint as to the particular manner of using the glasses to get a correct view. Do not attempt to take in the entire field at one sweep. Sight at a point near the ship, say at a distance of a quarter of a mile; then slowly raise the glasses so that your view grows more and more distant and finally the focal point reaches the horizon. Then turn a point to the right or to the left, and bring down the forward end of the glasses until the view is again concentrated on the point nearest the ship."

"That is something like making observations on a flying machine," replied Alfred, "only in that case the glass is held stationary, as the machine moves along, and in that way objects can be seen much better than by sweeping it around continuously. We learned that from Lieutenant Guyon."

"Quite true; I see you are well qualified to observe. But to continue: after you have thus made the first observation as I have explained, the glasses should be held horizontally to take in the view at the horizon, and then swept around at that angle to the right or to the left, depressing it at each swing. That is called sweeping the sea."

"I know two men who have glasses," said Ralph. "Shall I get them?"

"Yes, if you can; this is the kind of service which is appreciated," said the captain.

Ralph sprang down the ladder, and ran along the deck. He was absent for some time, but soon appeared with two men.

"Come on," said Ralph, as he ascended the ladder. The men hesitated for a moment, and followed, as an officer appeared and invited them to come up.

CHAPTER II

THE TORPEDOED SHIP

During the next hour or more every field glass on board ship was put into use, and many were the weary arms that used them until the luncheon hour arrived at one o'clock. The captain, knowing how trying the constant watching must be to civilians who are not used to this work, appointed two watches, so they might relieve each other every hour.

The boys went to the dining room, and as Mr. Elton and his family sat at the captain's table, the latter took occasion during the meal to refer to Ralph and Alfred's services on the bridge in commendatory terms, which was greatly appreciated by their parents.

"I am curious to know," said Ralph, "what the officer meant when he said 'two points to starboard.'"

"That is explained in this way," replied the captain. "The compass is divided into thirty-two points, or eight points in each quadrant."

"I remember you spoke about a quadrant when we were on the bridge. What is a quadrant?" asked Alfred.

"I should have said, in the beginning, that the compass is divided into four parts, one line running, we will say, east and west, and the other line north and south. In that way there are four cardinal points. You will understand, therefore, that from the north cardinal point to the east cardinal point, which represents one quadrant, are eight points, and so on, from the cardinal point east to south, are eight more points," responded the captain.

"Then when the officer said 'two points to starboard,' did he mean two points from one of the cardinal points?" asked Ralph.

"No, he had reference to two points from the line ahead, or for the time being, he took the line upon which we were traveling, as one of the cardinal lines, and when he said two points he described a line which was just one-fourth of the distance around the circle or quadrant to the east," answered the captain.

"Then we might say that the keel of the ship is one of the cardinal lines, and the bridge, which runs across the ship is the other line?" asked Alfred.

"That is a very homely and plain way of putting it," replied the captain.

An hour thereafter, while the boys were on the bridge, they noticed the first signs of excitement on the part of the officers. A message had been handed the captain a few moments before. Of course, all were curious to know the news it contained, but no one seemed to be bold enough to ask any questions.

The Points of the CompassToList

As the second watch appeared at the bridge the boys descended and rejoined their parents. A voice was heard outside summoning the passengers on deck. They were ranged along the deck house, and the second officer appeared.

"I wish to make an announcement, and give further instructions. In order that there may be no confusion, in the event the enemy should attack us and compel the passengers to take to the boats, I am going to assign places to all of you, so that the moment you hear the five bells you will know where to go, ready to man the boats. Now, notice the numbers on the boats, which you see are swung out on the davits ready to be launched. Be particular to note where your boat is located, and its number. When you come up the companionway from your cabin, fix in your mind whether your own boat is on the right or on the left side; some are liable to become confused in coming up.

"Boat No. 1; Mr. Elton, how many are in your party?"

"Five," was the answer.

"Then three more will be assigned; Mr. Wardlaw, wife and daughter; that will complete the first boat. No. 2," continued the officer, as he made the assignments. This was continued until the entire list was completed.

Four seamen were then designated for each of the boats, and the steward was directed to prepare emergency food for the different boats, and by direct