be uneasy about us."

"But they were half prepared, father."

"Jack is right," added Fritz, whose energies were again called into play by the thought of the Nelson in distress; "let us go on."

"Besides, on the word of a pilot, the sea will be very calm and gentle for some time to come: there is not the slightest danger."

"And what if there were?" replied Fritz.

"Well, Willis, I shall give up the pinnace to you till dark," said Becker, "and may God guide us; we shall return to-night, so as to arrive at Rockhouse early in the morning."

"Hurrah for the captain!" cried Willis, throwing a cap into the air.

The evolutions of a cap, thrown up towards the sky or down upon the ground, were very usual modes with Willis of expressing his joy or sorrow.

This homage rendered to Becker, he hastened to let a reef out of the sheet, and the pinnace, for a moment at rest, redoubled its speed, like post-horses starting from the inn-door under the combined influence of a cheer from the postillion and a flourish of the whip.

"There is a cockle-shell that skips along pretty fairly," said Willis; "but it wants two very important things."

"What things?"

"A caboose and a nigger."

"A caboose and a nigger?"

"Yes, I mean a pantry and a cook; a gale for breakfast is all very well, one gets used to it, it is light and easily digested; but the same for dinner is rather too much of a good thing in one day."

"I observed your thoughtful mother hang a sack on one of your shoulders, which appeared tolerably well filled—where is it?"

"Here it is," said Jack, issuing from the hatchway; "here are our stores: a ham, two Dutch cheeses, two callabashes full of Rockhouse malaga, and there is plenty of fresh water in the gourds; with these, we have wherewithal to defy hunger till to-morrow."

"Capital!" said Willis.

This time, however, a cap did not appear in the air, as the last one had not been seen since the former ovation.

"Let us lay the table," said Jack, arranging the coils of rope that crowded the deck. "Well, you see, Willis, we want for nothing on board the pinnace, not even a what-do-you-call-it?"

"A caboose, Master Jack."

"Well, not even a caboose."

"Quite true; and if the Nelson were in the offing, I would not exchange my pilot's badge for the epaulettes of a commodore; but, alas! she is not there."

"Cheer up, Willis, cheer up; one is either a man or one is not. What is the good of useless regrets?"

"Very little, but it is hard to be yard-armed while absent at my time of life—and afterwards—your health, Mr. Becker."

"That would be hard at any age, Willis; but I rather think it has not come to that yet."

"When it has come to it, there will be very little time left to talk it over."

"Did you not say, brother, that the Nelson might hear our signals without our hearing hers? If so, there is a chance for Willis yet."

"Certainly, Jack, because she has the wind in her favor to act as a speaking-trumpet, whilst we had it against us acting as a deafener."

"Is there any other influence that affects sound besides the wind?"

"Yes, I have already mentioned that temperature has something to do with it. Sound varies in intensity according to the state of the atmosphere. If, for example, we ring a small bell in a closed vessel filled with air, it has been observed that, as the air is withdrawn by the pump, the sound gradually grows less and less distinct."

"And if a vacuum be formed?"

"Then the sound is totally extinguished."

"So, then," objected Willis, "if two persons were to talk in what you call a vacuum, they would not hear each other?"

"Two persons could not talk in a vacuum," replied Ernest.

"Why not?"

"Because they would die as soon as they opened their mouths."

"Ah, that alters the case."

"If, on the contrary, a quantity of air or gas were compressed into a space beyond what it habitually held, then the sound," continued Ernest, "would be more intense than if the air were free."

"In that case a whisper would be equal to a howl!"

"You think I am joking, Willis; but on the tops of high mountains, such as the Himalaya and Mont Blanc, where the air is much rarified, voices are not heard at the distance of two paces."

"Awkward for deaf people!"

"Whilst, on the icy plains of the frozen regions, where the air is condensed by the severe cold, a conversation, held in the ordinary tone, may be easily carried on at the distance of half a league."

"Awkward for secrets!"

"And how does sound operate with regard to solid bodies?" inquired Jack.

"According to the degree of elasticity possessed by their veins or fibres."

"Explain yourself."

"That is, solid bodies, whose structure is such that the vibration communicated to some of their atoms circulates through the mass, are susceptible of conveying sound."

"Give us an instance."

"Apply your ear to one end of a long beam, and you will hear distinctly the stroke of a pin's head on the other; whilst the same stroke will scarcely be heard through the breadth of the wood."

"So that, in the first case, the sound runs along the longitudinal fibres where the contiguity of parts is closer, than when the body is taken transversely?"

"Just so."

"And across water?"

"It is heard, but more feebly."

For some time Fritz had been closely observing with the telescope a particular part of the horizon, when all at once he cried, "This time I see him distinctly; he is bearing down upon us."

"Who? the sloop?" cried Willis, starting up and letting fall the glass he had in his hand.

"What an extraordinary pace! he bounds into the air, then plumps into the water, then leaps up again, just like an India-rubber ball, that touches the ground only to take a fresh spring!"

"Impossible, Master Fritz; the Nelson tops the waves honestly and gallantly; but as to leaping into the air, she is a little too bulky for that."

"Ah, poor Willis, it is not the Nelson that is under my glass at present, but an enormous fish, ten or twelve feet in length."

"Oh, how you startled me!"

"Father! Ernest! prepare to fire! Jack, the harpoon! he is coming this way."

Fritz stood at the stern of the pinnace, his rifle levelled, following with his eyes the movements of the monster; when within reach, he fired with so much success and address that he hit the creature on the head. It then changed its course, leaving behind a train of blood.

"Let us after him, Willis; quick!"

The Pilot turned the head of the pinnace, and Jack immediately threw his harpoon.

"Struck!" cried he joyfully.

By the hissing of the line, and then the rapid impulsion of the pinnace, it was felt that the monster had more strength than the craft and its crew together.

Ernest and his father fired at the same time; the ball of the former was lost in the animal's flesh, that of the latter rebounded off a horny protuberance that armed the monster's upper lip.

Fritz had time to recharge his rifle; he levelled it a second time, and the ball went to join the former; but, for all that, the pinnace continued to cleave the water at a furious rate.

Becker seized an axe and cut the rope.

"Oh, father, what a pity! such a splendid capture for our museum of natural history!"

"It is a sword-fish, children; a monster of a dangerous species, and of extreme voracity. If, by way of reciprocity, the fish have a museum at the bottom of the sea, they will have some fine specimens of the human race that have become the prey of this creature; and it may be that we were on the way to join the collection."

"Did you observe the formidable dentilated horn?"

"It is by means of this horn or sword, from which it takes its name, that it wages a continual war with the whale, whose only mode of escape is by flourishing its enormous tail;