As we toiled slowly up the snow, we took off our veils from time to time, to look more clearly about us. The glare of the sun upon the snow was dazzling, and its intense whiteness contrasted wonderfully with the cloudless dark indigo-blue of the sky. Between twelve and one we reached the edge of the crater, 17,884 feet above the sea. The ridge upon which we stood was only a few feet wide, and covered with snow; but it seemed that there was still heat enough to keep the crater itself clear, for none lay on the bottom, or in clefts on the steep sides.
The crater was oval, full a mile in its longest diameter, and perhaps 700 to 800 feet in depth; and its almost perpendicular walls of basaltic lava are covered with red and yellow patches of sublimed sulphur. We climbed a little way down into it to get protection from the wind, but to descend further unassisted was not possible, so we sat there, with our legs dangling down into the abyss. Part of the malacate, or winder, used by the Indians in descending, was still there; but it was not complete, and even if it had been, so many months had elapsed since it was last used that we should not have cared to try it. It consisted of a rope of hide, descending into the bottom of the crater in a slanting direction; and the sulphur-collectors were lowered and drawn up it by a windlass, in a basket to which another rope was attached. A few years back, the volcano used to send up showers of ashes, and even large stones; but now it has sunk to the condition of a mere solfatara, sending out, from two crevices in the floor, great volumes of sulphurous acid and steam, with a loud roaring noise. The sulphur-working merely consisted in looking for places where the pumice-stone was fully impregnated with sulphur, and breaking out pieces, which were hauled up in the basket. The chief risk which the labourers ran was from the terrific snow-storms, which come on suddenly and without the slightest notice. Men at work collecting sulphur have once or twice been caught by such storms in parts of the crater at a distance from the rope, and buried in the snow.
The appearance of the “White Woman,” but little lower than the point where we stood, was very grand, but all other objects looked small. The two great plains of Mexico and Puebla, with their lakes and towns, were laid out like a map; and the ranges of mountains which hem them in made them look like Roman encampments surrounded by earthworks. Even now that the lakes have shrunk to a fraction of their former size, we could see the fitness of the name given in old times to the Valley of Mexico, Anahuac, that is, “By the Water-side.” The peaks of Orizaba and Perote were conspicuous to the east; to the north lay the silver-mountains of Pachuca; and to the south-west a darker shade of green indicated the forests and plantations of the tierra caliente, below Cuernavaca.
It was a novel sensation to be at an altitude where the barometer stands at 15½ inches, so that the pressure on our lungs was hardly more than one-half what we are accustomed to in England; but we did not experience much inconvenience from it. The last thousand feet or so had been very hard work, and we were obliged to stop every few steps, but on the comparatively level edge of the crater we felt no difficulty in moving about.
Popocatepetl means “Smoking Mountain.” The Indians naturally enough considered it to be the abode of evil spirits, and told Cortes and his companions that they could never reach the top. One of the Spaniards, Diego Ordaz, tried to climb to the summit, and got as far as the snow; whereupon he returned, and got permission to put a burning mountain in his coat of arms, in commemoration of the exploit! If, as he declared, a high wind was blowing, and showers of ashes falling, his turning back was excusable, though his bragging was not. He seems to have afterwards told Bernal Diaz that he got to the top, which we know, by Cortes’ letters to Spain, was not true. A few years later, Francesco Montano went up, and was lowered into the crater to get sulphur. When Humboldt relates the story, in his New Spain, he seems incredulous about this; but since the Essai Politique was written the same thing has been regularly done by the Indians, as the merest matter of business, until the crater has been fairly worked out.
We took our last look at Mexico from the ridge of the crater, and, descending twenty feet at a stride, soon reached the bottom of the cone. As far as we could see, the substance of the hill seemed to be of basaltic lava, which was mostly covered with the lapilli which I have spoken of before as ashes and volcanic sand. Even before we reached the pine-forest there was evidence of the action of water, which had covered the slope of the mountain with beds of thick compact tufa, composed of these lapilli mixed with fragments of lava. The water-courses had cut deep channels through these beds, and down into the rock below; so that the streams from the melted snow rushed down between walls of lava, in which traces of columnar structure were observable.
The snow we had travelled over was sometimes dry and powdery, and sometimes hard and compact. There were no glaciers, and no glacier-ice, properly so called. It never rains at this elevation; and, though evaporation goes on rapidly with half the pressure taken off the air, and a great increase in the intensity of the sun’s rays, the snow either passes directly into vapour, or carries the water off instantaneously, as it is formed. Only so much water seems to be produced and re-frozen as suffices to make the snow hard, and in some favourable places near the rocks to form lumps of ice, and some of those great icicles which the Spaniards brought down from the mountain on their first expedition, so greatly astonishing their companions.
When we reached the rancho we thought of passing another night there; but the Indians who had gone down to the valley for corn had not returned, and everything was eaten up except beans, which are all very well as accessories to dinner, but our English digestions could not stand living upon them; so we started at once for San Nícolas de los Ranchos. Our ride was down a deep ravine, by the side of a mountain-torrent coming down from the snows of Popocatepetl; and, when we stopped now and then to look behind us, we had one of the grandest views which I have ever witnessed. The elements of the picture were simple enough. A deep gorge at our feet, with a fierce torrent rushing down it, dark pine-trees all round us, and above us—on either side—a snow-covered mountain towering up into the sky. We were just in the track of the Spanish invaders, who crossed most likely by this very road between the two volcanos; and they record the amazement which they felt that in the tropics snow should be unmelted upon the mountains.
A few hours riding down the steep descent, and we were in the flat plain of Puebla. There were our two mountains behind us, but now they looked as we had so often seen them before from a distance. The power of realizing their size was gone, and with it most of their grandeur and beauty. Nothing was left us but a vivid recollection of the wonderful scenes that were before us a few hours ago, impressions not likely to be ever effaced from our minds, where the picture of the great snowy cone seen in the bright moonlight, and the descent between the mountains, remain indelibly impressed as the types of all that is most grand and impressive in the scenery of lofty mountains.
We slept at San Nícolas de los Ranches, “St. Nicholas of the huts,” where the shopkeeper, to whom we had a letter, insisted upon turning out of his own room for us, and treated us like princes. The reason of our often being provided with letters to the shopkeepers in small places, was, that they are the only people who have houses fit for entertaining travellers. Many of them are very rich, and in the United States they would call themselves merchants. Next morning our Indian carrier, who had ascended the mountain without a veil, was brought in by our guide, a pitiful object. All the skin of his face was peeling off, and his eyes were frightfully inflamed, so that he was all but blind, and had to be led about. Fortunately, this blindness only lasts for a time, and no doubt he got well in a few days.