As yet, however, there were no symptoms of such a dire disaster; they were in excellent health and tolerable spirits; they had provisions enough to last them for six months at least, and consequently had not as yet, at all events, the slightest occasion to manifest a tendency to anthropophagism.

“I can understand the sea,” remarked Jack, “as I understand the land and the sky; God created them, that is enough; but I cannot understand how a mighty river like the Nile or the Ganges can continue eternally discharging immense deluges of water into the sea without becoming exhausted.  From what fathomless reservoirs do the Amazon and the Mississippi receive their endless torrents?”

“The reservoirs of the greatest rivers,” replied Fritz, “are nothing more than drops of water that fall from the crevice of some rock on or near the summit of a hill; these are collected together in a pool or hollow, from which they issue in the form of a slender rivulet.  At first, the smallest pebble is sufficient to arrest the course of this thread of water; but it turns upon itself, gathers strength, finally surmounts the obstacle, dashes over it, unites itself with other rivulets, reaches the plain, scoops out a bed, and goes on, as you say, for ever emptying its waters into the sea.”

“Yes; but it is the source of these sources that I want to know the origin of.  You speak of hills, whilst we know that water naturally, by reason of its weight and fluidity; seeks to secrete itself in the lowest beds of the earth.”

“It is scarcely necessary for me to observe that water may come down a hill, although it never goes up.  Rain, snow, dew, and generally all the vapors that fall from the atmosphere, furnish the enormous masses of water that are constantly flowing into the sea.  The vapor alone that is absorbed in the air from the sea is more than sufficient to feed all the rivers on the face of the earth.  Mountains, by their formation, arrest these vapors, collect them in a hole here and in a cavern there, and permit them to filter by a million of threads from rock to rock, fertilizing the land and nourishing the rivers that intersect it.  If, therefore, you were to suppress the Alps that rise between France and Italy, you would, at the same time, extinguish the Rhone and the Po.”

“It would be a pity to do that,” said Jack; “there was a time though when there were no Pyrenees.”

“That must have been, then, at a period prior to the formation of granite, which is esteemed the oldest of rocks.”

“No such thing,” insisted Jack; “it was so late as 1713, when, by the peace of Utrecht, the crown of Spain was secured to the Duke of Anjou, grandson of Louis XIV.”

“Howsomever,” remarked Willis, “all the mariners in the French fleet could not convince me that the Pyrenean mountains are only a hundred years old.”

“My brother is only speaking metaphorically,” said Fritz; “when the crown of Spain was assigned to the Duke of Anjou, his grandfather said—­Qu il n’y avait plus de Pyrenees.  He meant by that simply, that France and Spain being governed by the same prince, the moral barrier between them existed no longer.  The formidable mountains still stood for all that, and he who removes them would certainly be possessed of extraordinary power.”