Passing in full view of these picturesque craters, now mostly covered with trees and brushwood, we begin to ascend, and are soon among the porphyritic range that forms a wall between us and the land of sugar-canes and palms. Along the road towards Mexico came long files of Indians, dressed in the national white cotton shirts and short drawers and sandals, made like Montezuma’s, though not with plates of gold on the soles, such as that monarch’s sandals had. Some of these Indians are bringing on their backs wood and charcoal from the pine-forest higher up among the mountains, and some have fastened to their backs light crates full of live fowls or vegetables; others are carrying up tropical fruits from the tierra caliente below, zapotes and mameis, nisperos and granaditas, tamarinds and fresh sugar-canes. These people are walking with their loads thirty or forty miles to market: but their race have been used as beasts of burden for ages, and they don’t mind it. Bright blue and red birds, and larger and more brilliant butterflies than are seen in Europe, show that, though we are among fields of wheat and maize, we are in the tropics after all. As the road rises we get views of the broad valley, with its lakes and green meadows, and the great white haciendas with their clumps of willows, their church-towers, and the clusters of adobe huts surrounding them—like the peasants’ cottages in feudal Europe, crowding up to the baron’s castle. Our mules begin to flag as we toil up the steep ascent; but the conductor rattles the stones in his black bag, and as the ominous sound reaches their ears, they start off again with renewed vigour. We pass San Mateo, a village of charcoal-burners, where a large and splendid stone church, with its tall dark cypresses, stands among the huts of reeds and pine-shingles that form the village. [Illustration: INDIANS BRINGING CHARCOAL, &C. TO MEXICO.] Trains of mules are continually passing with their heavy loads of wood and charcoal, bales of goods and barrels of aguardiente de caña, which is rum made from the sugar-cane, but not coloured like that which comes to England. The men are continually rushing backwards and forwards among their beasts, which are not content with kicking and biting, and banging against one another, but are always trying to lie down in the road; and one of the principal duties of the arriero is constantly to keep an eye on all his beasts at once, and, when he sees one preparing to lie down, to be beforehand with him, and drive him on by a furious shower of blows, kicks, and curses. Certainly, the Mexican mules are the finest and strongest in the world; and, though they are just as obstinate here as elsewhere, they are worth two or three times as much as horses.