They found it was a CASUCHA, constructed by the Indians, made of ADOBES, a species of bricks baked in the sun. Its form was that of a cube, 12 feet on each side, and it stood on a block of basalt. A stone stair led up to the door, the only opening; and narrow as this door was, the hurricane, and snow, and hail found their way in when the TEMPORALES were unchained in the mountains.

Ten people could easily find room in it, and though the walls might be none too water-tight in the rainy season, at this time of the year, at any rate, it was sufficient protection against the intense cold, which, according to the thermometer, was ten degrees below zero. Besides, there was a sort of fireplace in it, with a chimney of bricks, badly enough put together, certainly, but still it allowed of a fire being lighted.

"This will shelter us, at any rate," said Glenarvan, "even if it is not very comfortable. Providence has led us to it, and we can only be thankful."

"Why, it is a perfect palace, I call it," said Paganel; "we only want flunkeys and courtiers. We shall do capital here."

"Especially when there is a good fire blazing on the hearth, for we are quite as cold as we are hungry. For my part, I would rather see a good faggot just now than a slice of venison."

"Well, Tom, we'll try and get some combustible or other," said Paganel.

"Combustibles on the top of the Cordilleras!" exclaimed Mulrady, in a dubious tone.

"Since there is a chimney in the CASUCHA," said the Major, "the probability is that we shall find something to burn in it."

"Our friend McNabbs is right," said Glenarvan. "Get everything in readiness for supper, and I'll go out and turn woodcutter."

"Wilson and I will go with you," said Paganel.

"Do you want me?" asked Robert, getting up.

"No, my brave boy, rest yourself. You'll be a man, when others are only children at your age," replied Glenarvan.

On reaching the little mound of porphyry, Glenarvan and his two companions left the CASUCHA. In spite of the perfect calmness of the atmosphere, the cold was stinging. Paganel consulted his barometer, and found that the depression of the mercury corresponded to an elevation of 11,000 feet, only 910 meters lower than Mont Blanc. But if these mountains had presented the difficulties of the giant of the Swiss Alps, not one of the travelers could have crossed the great chain of the New World.

On reaching a little mound of porphyry, Glenarvan and Paganel stopped to gaze about them and scan the horizon on all sides. They were now on the summit of the Nevadas of the Cordilleras, and could see over an area of forty miles. The valley of the Colorado was already sunk in shadow, and night was fast drawing her mantle over the eastern slopes of the Andes. The western side was illumined by the rays of the setting sun, and peaks and glaciers flashed back his golden beams with dazzling radiance. On the south the view was magnificent. Across the wild valley of the Torbido, about two miles distant, rose the volcano of Antuco. The mountain roared like some enormous monster, and vomited red smoke, mingled with torrents of sooty flame. The surrounding peaks appeared on fire. Showers of red-hot stones, clouds of reddish vapor and rockets of lava, all combined, presented the appearance of glowing sparkling streams. The splendor of the spectacle increased every instant as night deepened, and the whole sky became lighted up with a dazzling reflection of the blazing crater, while the sun, gradually becoming shorn of his sunset glories, disappeared like a star lost in the distant darkness of the horizon.

Paganel and Glenarvan would have remained long enough gazing at the sublime struggle between the fires of earth and heaven, if the more practical Wilson had not reminded them of the business on hand. There was no wood to be found, however, but fortunately the rocks were covered with a poor, dry species of lichen. Of this they made an ample provision, as well as of a plant called LLARETTA, the root of which burns tolerably well. This precious combustible was carried back to the CASUCHA and heaped up on the hearth.