2. We do not, however, mean to assert, that the progress of Polar discovery is always followed by a corresponding increase in the capture of fish in the Arctic seas. On the contrary, the take of oil-yielding animals is steadily decreasing, and even if an open sea should be discovered in 82° N.L., in which whales should be found in as great abundance as ice-floes unhappily are, the whaler with his poor equipment would never be able to follow them thither. The fur countries, once as productive as the mines of Peru, are incapable of further extension; even the treasures of mammoths’ tusks have become rare, and in order to bring thirty tons of lignite from the north-east of Greenland, a ship must expend seventy tons of sound coal in the transit, besides passing the winter there. That the teas of China, the silks of Japan, the spices of the Moluccas will never descend to us from the ice-fields has long been settled. No one at the present day thinks any longer of the commercial value of the North-West and North-East passages. Modes of escape from the perils and caprices of the ice have grown out of the endeavour to discover routes of commerce, which lay beyond the reach of the cannon of the Spaniards at the time when they aspired to the monopoly of the trade of the world. The reward of 25,000 gulden, offered by the Dutch government for the discovery of a North-East passage, and that of £20,000 by the English parliament for the North-West passage, have never been paid, because never claimed, nor are they, in the least degree, likely to be claimed.[12] 3. Yet, quite independent of material results, Polar exploration presents no unworthy object for scientific investigation—a region of the globe 120,000 square miles in extent never yet entered by man. The Polar question, as _a problem of science_, aims at determining the limits of land and water, at the perfecting of that network of lines with which comparative science seeks to surround our planet, even to its Poles. The completion of this labour will serve to discover those physical laws which regulate climates, the currents of the atmosphere and sea, and the analogies of geology with the earth as we see it.