With the winter, work had been resumed in the interior of Granite House, mending clothes and different occupations, among others making the sails for their vessel, which were cut from the inexhaustible balloon-case. During the month of July the cold was intense, but there was no lack of either wood or coal. Cyrus Harding had established a second fireplace in the dining-room, and there the long winter evenings were spent. Talking while they worked, reading when the hands remained idle, the time passed with profit to all. It was real enjoyment to the settlers when in their room, well lighted with candles, well warmed with coal, after a good dinner, elderberry coffee smoking in the cups, the pipes giving forth an odoriferous smoke, they could hear the storm howling without. Their comfort would have been complete, if complete comfort could ever exist for those who are far from their fellow-creatures, and without any means of communication with them. They often talked of their country, of the friends whom they had left, of the grandeur of the American Republic, whose influence could not but increase; and Cyrus Harding, who had been much mixed up with the affairs of the Union, greatly interested his auditors by his recitals, his views, and his prognostics. It chanced one day that Spilett was led to say-- “But now, my dear Cyrus, all this industrial and commercial movement to which you predict a continual advance, does it not run the danger of being sooner or later completely stopped?” “Stopped! And by what?” “By the want of coal, which may justly be called the most precious of minerals.” “Yes, the most precious indeed,” replied the engineer; “and it would seem that nature wished to prove that it was so by making the diamond, which is simply pure carbon crystallized.” “You don’t mean to say, captain,” interrupted Pencroft, “that we burn diamonds in our stoves in the shape of coal?” “No, my friend,” replied Harding. “However,” resumed Gideon Spilett, “you do not deny that some day the coal will be entirely consumed?” “Oh! the veins of coal are still considerable, and the hundred thousand miners who annually extract from them a hundred millions of hundredweights have not nearly exhausted them.” “With the increasing consumption of coal,” replied Gideon Spilett, “it can be foreseen that the hundred thousand workmen will soon become two hundred thousand, and that the rate of extraction will be doubled.” “Doubtless; but after the European mines, which will be soon worked more thoroughly with new machines, the American and Australian mines will for a long time yet provide for the consumption in trade.” “For how long a time?” asked the reporter. “For at least two hundred and fifty or three hundred years.” “That is reassuring for us, but a bad look-out for our great-grandchildren!” observed Pencroft. “They will discover something else,” said Herbert.