"Then plants," continued Jack, "are still more prolific than animals.

Some trees can produce as many of their kind as they have branches, or even leaves. An elm tree, twelve years old, yields sometimes five hundred thousand pods; and, by the way, Willis, to encourage you in carrying on the war against the mosquitoes, a single stalk of tobacco produces four thousand seeds."

"The leaves, however, are of more use to me than the seeds," replied Willis.

"This admirable proportion between the productiveness of the two kingdoms demonstrates the far-seeing wisdom of Providence. If the power of multiplication in vegetables had been less considerable, the fields, gardens, and prairies would have been deserts, with only a plant here and there to hide the nakedness of the land. Had God permitted animals to multiply in excess of plants, the entire vegetation would soon have been devoured, and then the animals themselves would of necessity have ceased to exist."

"How is it, then," inquired Willis, "with this continual multiplication always going on, the inhabitants of land and sea do not get over-crowded?"

"Why, as regards man, for example, if thirteen or fourteen human beings are born within a given period, death removes ten or eleven others; but though this leaves a regular increase, still the population of the globe always continues about the same."

"It may be so, Master Jack, but when I was a little boy at school, I generally came in for a whipping, if I made out two and two to be anything else than four."

"And served you right too, Willis; but if the human family did not continually increase, if the number of deaths exceeded continually that of the births, at the end of a few centuries the world would be unpeopled."

"Very good; but if, on the other hand, there is a continual increase, how can the population continue the same?"

"Because the increase supposes a normal state; that is to say, the births are only estimated as compared with deaths from disease or old age. But then there are shipwrecks, inundations, plagues, and war, which sometimes exterminate entire communities at one fell swoop. Then whole nations die out and give place to the redundant populations of others; phenomena now observed in the cases of the aborigines of Australia and America."

"Very true."

"No signs of furs yet," cried Fritz, who was every now and then levelling his rifle at the phantoms on shore.

"We need not dread," continued Jack, "ever being hustled or jostled on the earth; life will fail us before space. There are now eight hundred millions of human beings in existence, and, according to the most moderate computation, room enough for twice that number. As it is, the most fertile sections of the earth are not the most populous; there are four hundred millions in Asia, sixty millions in Africa, forty in America, two hundred and thirty in Europe, and only seventy millions in the islands and continent of Oceanica!"

"To which," remarked Fritz, "you may add the eleven inhabitants of New Switzerland."

"Assuming, then, this calculation to be nearly accurate, though authorities vary materially in their computations of the earth's inhabitants, and regarding it in connexion with the average duration of human life, a thousand millions of mortals must perish in thirty-three years; to descend to detail, thirty millions every year, three thousand four hundred every hour, sixty every minute, or ONE EVERY SECOND."

"Aye," remarked Willis, "we are here to-day and gone to-morrow."

"Suppose, then, that the population of the earth were twice as great, cultivation would be extended, territories that are now lying waste would be teeming with life and covered with fertile fields, but the same beautiful equilibrium would be maintained."

"And the inhabitants of the planets," said Fritz, "what are they about?"

"What planets do you mean?" inquired Willis.

"Well, all in general; the moon, for example, in particular."

"The moon," replied Jack, "has, in the first place, no atmosphere.

This we know, because the rays of the stars passing behind her are not, in the slightest degree, refracted; and this proves that neither men, nor animals, nor vegetables of any kind, are to be found in that planet, for they could not exist without air."

"That should settle the question," remarked Willis.

"Yes," remarked Fritz; "but some theorists, nevertheless, insist that there may be living creatures in the moon, for all that--of course, differently constituted from the inhabitants of our earth, and susceptible of existing without air. There is, however, no evidence of any kind to support such a theory; it is a mere fancy, the dream of an imaginative brain. Upon the same grounds, it may be argued, that the interior of the earth is inhabited, and that elves and gnomes are possible beings. Besides, the telescope has been brought to so high a degree of perfection, that objects the size of a house can now be detected in the moon."

"It seems, I am afraid," remarked Jack, who, like his brother, was getting annoyed by the phantasmagoria on shore, "that we were about as well supplied with wild beasts here as they are with men in the planets."

"In speaking of the moon, however," continued Fritz, "I do not imply all the planets; for, certain as we are that the moon has no atmosphere, so we are equally certain that some of the planets possess that attribute. Still there are other circumstances that render the notion of their being inhabited by beings like ourselves exceedingly improbable. Mercury, for example, is so embarrassed by the solar rays, that lead must always be in a state of fusion, and water, if not reduced to a state of vapor, will be hot enough to boil the fish that are in it. Uranus, at the other extremity of the system, receives four hundred times less heat and light than we do, consequently neither water nor any thing else can exist there in a liquid state; what is fluid on our earth must be frozen up into a solid mass. Good, I declare my brother has fallen asleep!"

"It is very--interesting--however," said Willis, making ineffectual efforts to smother a yawn.

"The same difficulty with comets; there must have been some very urgent necessity for human beings in order to have peopled them. When they pass the perihelion--"

"The what?" inquired Willis.

"The point where they approach nearest the sun--when they pass the perihelion, I was going to say, the heat they endure must be terrific; when on the other hand, at their extreme distance from that body, the cold must be intense. The comet of 1680 did not approach within five thousand _myriametres_ of the sun."

"Friends coming within that distance of each other should at least shake hands," said Willis.

"Still, even at that distance, the heat, according to Newton, must be like red-hot iron, and if constituted like our earth, when heated to that degree, must take fifty thousand years to cool."

"Fifty thousand years!" said Willis, yawning from ear to ear.

"The central position between these extremes, which would either congeal our earth into a mass of ice or burn it up into a heap of cinders, is therefore the most congenial to such beings as ourselves.

Whence I conclude--"

Here the crimson flashes of Willis's pipe, which had been gradually diminishing in brilliance suddenly ceased; _contralto_ notes issued from the profundities of his breast, and it became evident to the orator that all his audience were sound asleep.

"Whence I conclude," said Fritz, addressing himself, "that my orations must be somewhat soporiferous."

Being thus left alone to keep a look-out on shore, his thoughts gradually receded within his own breast, where all was rose-colored and smiling, for at his age rust has not had time to corrupt, nor moths to eat away. And it was not long before he himself, like his two companions, was fast locked in the arms of sleep.

How long this state of things lasted the chronicle saith not; but the three sleepers were eventually awakened by a simultaneous howl of the dogs. They were instantly on their feet, with their rifles levelled.

It was too late; day had broken, and there was light enough to convince them that nothing was to be seen. The sheep's quarters had, however, entirely disappeared, and they had the satisfaction of knowing that they had politely given the denizens of the forest a feast gratis.

"Ah, they shall pay us for it yet," said Jack.

"This is a case of the hunters being caught instead of the game,"

remarked Fritz.

"The poor sheep! If Ernest had been here, he would have erected a monument to its memory."

"I doubt that; epitaphs are generally made rather to please the living than to compliment the defunct. But, Willis, we must deprive you of your office of huntsman in chief--I shall go into the forest and revenge this insult."

"I have no objection to abdicate the office of huntsman, but must retain that of admiral, in which capacity I announce to you that there will be a storm presently, and that we shall just have time to make Rockhouse before it overtakes us."

"That is rather a reason for our remaining where we are."

"We have come for skins, and skins we must have."

"Besides, we are two to one, and in all constitutional governments the majority rules."

"Have you both made up your minds?" inquired Willis.

"Yes, we are quite decided."

"In that case," said Willis, "let us hoist the anchor and be off home."