id="id00081">"Why, that would have been well enough," assented Jack, "before I had such a chance in your submarine service. No; I mean I'd like to see Annapolis. I'd like to watch the midshipmen at their training, and see the whole naval life there."

"It's too bad every fellow can't have his wish gratified as easily," continued Jacob Farnum.

"Do you mean we're going to Annapolis, too?" asked Jack Benson, his eyes glowing. Even Hal Hastings sat up straighter in his chair, watching the shipbuilder's face closely.

"Yes," nodded Jacob Farnum. "Permission has been granted for me to send our second boat, the 'Farnum,' along with the 'Pollard'—both under the care of the—"

"The Dad boat," laughed Hastings.

"Yes; that will give us a chance to have the 'Farnum' studied most closely by some of the most capable officers in the United States Navy. It ought to mean, presently, the sale of the 'Farnum' to the Government."

"That's just what it will mean," promised Captain Jack, "if any efforts of ours can make the Navy men more interested in the boat."

"You three youngsters are likely to be at Annapolis for some time," went on Mr. Farnum. "In fact—but don't let your heads become too enlarged by the news, will you!"

Hal, quiet young Hal, neatly hid a yawn behind one hand, while Benson answered for both:

"We're already wearing the largest-sized caps manufactured, Mr. Farnum.
Don't tempt us too far, please!"

"Oh, you boys are safe from the ordinary perils of vanity, or your heads would have burst long ago. Well, then, when you arrive at Annapolis, you three are to act as civilian instructors to the middies. You three are to teach the midshipmen of the United States Navy the principles on which the Pollard type of boat is run. There; I've told you the whole news. What do you think of it!"

Mr. Farnum's cigar having burned low, he tossed it away, then leaned back as he lighted another weed.

"What do we think, sir?" echoed Captain Jack, eagerly. "Why, we think we're in sight of the very time of our lives! Annapolis! And to teach the middies how to run a 'Pollard' submarine."

"How soon are we likely to have to start, sir!" asked Hal Hastings, after a silence that lasted a few moments.

"Whenever the 'Hudson' shows up along this coast, and the officer in command of her gives the word. That may be any hour, now."

"Then we'd better find Eph," suggested Captain Jack, "and pass him the word. Won't Eph Somers dance a jig for delight, though!"

"Yes; we'd better look both boats over at once," replied Mr Farnum, picking up his hat "And we'll leave word for Grant Andrews and some of his machinists to inspect both craft with us. There may be a few things that will need to be done."

As they left the office, crossing the yard, Captain Jack Benson and Hal Hastings felt exactly as though they were walking on air. Even Hal, quiet as he was, had caught the joy-infection of these orders to proceed to Annapolis. To be sent to the United States Naval Academy on a tour of instruction is what officers of the Navy often call "the prize detail."

Farnum and his two youthful companions went, first of all, to the long, shed-like building in which the third submarine craft to be turned out at this yard was now being built. From inside came the noisy clang of hammers against metal. The shipbuilder stepped inside alone, but soon came out, nodding. The three now continued on their way down to the little harbor. All of a sudden the three stopped short, almost with a jerk, in the same second, as though pulled by a string.

At exactly the same instant Jacob Farnum, Captain Jack Benson and
Engineer Hal Hastings put up their hands to rub their eyes.

Their senses had told them truly, however. While the "Pollard" rode serenely at her moorings, the "Farnum," the second boat to be launched, was nowhere to be seen!

"What on earth has happened to the other submarine?" gasped the shipbuilder, as soon as he could somewhat control his voice.

What, indeed?

There was not a sign of her. At least, she had not sunk at her moorings, for the buoys floated in their respective places, with no manner of tackle attached to them.

"A submarine boat can't slip its own cables and vanish without human hands!" gasped the staggered Jack Benson.

"There's something uncanny about this," muttered Hal Hastings.

Jacob Farnum stood rooted to the spot, opening and closing his hands in a way that testified plainly to the extent of his bewilderment.

CHAPTER II

HOW EPH FLIRTED WITH SCIENCE

Jack Benson was the first of the trio to move.

Without a word he broke into a run, heading for the narrow little shingle of beach.

"Got an idea, Captain?" shouted Jacob Farnum, darting after his young submarine skipper.

"Yes, sir!" floated back over Jack's shoulder.

"Then what's at the bottom—"

"Eph and the boat, both together, or I miss my guess," Captain Jack shouted back as he halted at the water's edge, where a rowboat lay hauled up on the shore.

Jacob Farnum's face showed suddenly pallid as he, also, reached the beach. Hal, who was in the rear, did not seem so much startled.

"Do you think Eph has gone off on a cruise all alone?—that he has come to any harm?" gasped the shipbuilder.

"I don't know, but I'm not going to worry a mite about Eph Somers until
I have to," retorted Jack Benson, easily.

"Eph can generally take care of himself," added Hal Hastings. "He rarely falls into any kind of scrape that he can't climb out of."

"But this is a bad time for him to take the 'Farnum' and cruise away," objected the owner of the yard. "The 'Hudson' may be here at any hour, you know, and we ought to be ready for orders."

As he spoke, Mr. Farnum scanned the horizon away to the south, out over the sea.

"There's a line of smoke, now, and not many miles away," he announced
"It may, as likely as not, be smoke from the 'Hudson's' pipe."

"Going out with us, sir!" inquired Captain Jack Benson, as Hal took his place at a pair of oars.

"Yes," nodded the owner of the yard, dropping into a seat at the stern of the boat, after which Benson pushed off at the bow.

Down on the seashore, on this day just past the middle of October, the air was keen and brisk. There had been frost for several nights past. Sleighing might be looked for in another month.

"Cable's gone from this buoy," declared Captain Jack, as Hal rowed close.
"Over to the other one, old fellow."

Here, too, the cable was missing. Evidently the "Farnum" had made a clean get-away. If there had been any accident, it must have taken place after the new submarine boat had slipped away from her moorings.

"Humph!" grunted Jack, scanning the sea. "No sign of the boat anywhere.
Eph may be anywhere within twenty miles of here."

"Or within twenty feet, either," grinned Hal, looking down into the waters that were lead colored under the dull autumn sky.

"What are we going to do, Captain?" inquired Jacob Farnum. "There are
Grant Andrews and three of his machinists coming down to the water."

"I reckon, sir, we'd better