"There is some one waving to us," declared Dave, staring across the water at the occupants of a small motor boat.

"Why, it looks like Captain Chapin," returned Dalzell.

"It _is_ Chapin, and that is his sister with him," returned Dave. "See, she is standing up in the bow to wave her handkerchief to us."

"Chapin ought not to allow her to stand up in the bow of such a narrow craft," said Danny Grin. "It's a risky pose for any one but a veteran sailor. It's dangerous. She-"

"By Jove!" burst from Darrin. "There she goes-overboard!"

For a rolling wave, catching the small motor boat under the bow, had rocked the little craft.

Miss Chapin was seen to stagger wildly and then plunge overboard.

"They've stopped!" cried Dan. "She doesn't come up, either!"

"Boatswain's mate!" rang out Ensign Darrin's voice sharply to the naval launch alongside. "Put over there at once. Run astern of the motor boat's position."

"Aye, aye, sir," and the naval launch swung briskly around.

"I beg your pardon, Hale, for forgetting that you are ranking officer here," Dave apologized, keeping his gaze out over the water.

"There's no apology needed," returned Ensign Hale. "Our only need is to reach the spot as quickly as possible."

The motor boat had stopped. Captain Chapin at the first realization of the incident, had leaped up, and now stood scanning the water for the first glimpse of his sister when she would rise to the surface.

So great was the excitement on the naval launch that neither Dave nor Dan really noticed it when another man aboard the motor boat rose more slowly, showing his head for the first time above the gunwale.

As the motor boat put about on her course both Captain Chapin and this other man dived overboard.

"I wonder if they see Miss Chapin yet?" muttered Dave, as the naval launch raced to the scene.

It was speedily apparent that Miss Chapin had not yet been found, for both hatless swimmers swam about uncertainly, going down head first, from time to time, as though to explore the water near the surface.

Then the naval launch plunged into the scene. From it dived three ensigns and two sailors aboard who were not engaged with the handling of the craft.

With seven expert swimmers now in the water, Miss Lucy Chapin stood an excellent chance of being found.

Hardly had the Navy men dived when Captain Chapin's male companion swam with long overhand strokes away from the rest.

"I see her!" shouted this swimmer, and dived.

"He has her!" panted Dalzell. "Hooray!"

Instantly six swimmers turned and swam toward the rescuer, who now appeared on the surface supporting a woman's head on his shoulder.

"Good work! Fine!" cheered Dave.

Captain Chapin was the first to reach his sister's rescuer.

"Is Lucy dead?" cried Chapin anxiously, when he beheld his sister's white face.

"Stunned," replied the rescuer. "I think she must have been struck on the head by the boat as it pa.s.sed her."

Silently the other swimmers turned in behind the young woman, her rescuer and brother.

"Better bring Miss Chapin to the 'Castoga's' boat, Captain," Dave called. "It's larger. We'll take her directly to the gunboat and have the surgeon attend her."

The boatswain's mate ran the naval launch up within easy distance, and Miss Chapin was lifted aboard.

On one of the cushions Miss Chapin was laid, while all gathered about her anxiously.

"Make the 'Castoga' with all speed," ordered Ensign Hale. "The young lady must have prompt attention."

On the way to the "Castoga" Captain Chapin did everything he could think of to revive his sister. The others stood about, ready to help.

Then it was that Dave happened, for the first time, to face the rescuer.

"Pembroke!" he called in astonishment.

"Howdy do?" asked the Englishman, with a smile holding out his hand.

Though Dave felt himself chilling with suspicion of the pleasant stranger, he could not withhold his hand.

"I was on my way out to visit your ship," smiled Pembroke, as he released Dave's hand after a warm grip. "Captain Chapin was good enough to say that he would present me on board."

"And glad indeed I am that I undertook to do so," exclaimed Chapin. "If it hadn't been for you, Pembroke, I am afraid my sister would have been lost."

Pembroke was now engaged in shaking hands with Dalzell, who felt obliged to present him to Ensign Hale.

"A splendid rescue, that," said Hale warmly.

The gunboat's launch was now speedily alongside the "Castoga," the motor boat, a small craft that carried pa.s.sengers on the bay for hire, following at slower speed.

"We've a half-drowned young lady on board, who needs the surgeon's attention," called Hale, between his hands, just before the launch ran alongside.

Miss Chapin was immediately taken on board, and carried to the quarters of the executive officer, where she was laid in a bunk. Only her brother and the surgeon remained with her.

Dave felt obliged to introduce Pembroke to his brother officers. The Englishman proceeded to make their acquaintance with evident delight.

Five minutes later the executive officer recovered his presence of mind sufficiently to send ash.o.r.e to Cavite for dry garments of a size suitable for Miss Chapin's use. In an hour or two that young lady, revived and attired in dry clothing, was brought on deck on her brother's arm. She was weak, but out of danger.

"We came out in order to make a call aboard," Captain Chapin explained to the officers under the quarter-deck awning, "but we had no idea we were going to make such a sensational visit."

"I fancy that women are always nuisances aboard naval craft," smiled Miss Chapin, whereupon the a.s.sembled officers promptly a.s.sured her that women were nothing of the sort.

In the meantime the three officers who had leaped over into the bay had had time to change their clothing. It became a merry party on deck.

Up to Mr. Warden stepped a messenger, saluting.