A day's march through the mountains brought them into a lofty plateau, some seven thousand feet above the sea. Here were wide-spreading forests of trees, which Roger recognized as large oaks and cypress. Around the villages were clearings, and whereas in the plains below maize was chiefly cultivated, the largest proportion of the fields, here, were devoted to plantations of the aloe or maguey. Here, even at midday, the temperature was not too hot to be pleasant; while at night the cold was great, and Roger was glad to pile the thick quilted rugs over him. After traversing this plateau for some distance, they came upon another range of hills, far loftier than those they had before crossed, and vastly higher than anything Roger had ever before beheld in his travels. These mountains were, the merchant told him, the Cordilleras; they extended from unknown regions in the north through Anahuac to the south. The snow never melted upon the summits, and several of the highest of these were terrible volcanoes, whose eruptions were dreaded by the whole nation. "Sometimes before these commenced," the merchant said, "the earth trembled and shook, so that men could scarce stand upon it: Houses were thrown down, and terrible destruction of life and property took place. Fortunately, these are rare occurrences; but several of them have taken place since the time when the Aztecs first established themselves here." The passage through this range was attended with real hardship. Roger, accustomed to our English winter only in the mild climate of South Devonshire, felt the cold to be severe; but the natives suffered far more, and the merchants continued their march right through one night, for the labor of carrying their burdens kept the blood of the thinly clad slaves in motion; whereas, if they had halted, many would have succumbed to the cold. At last the path began to descend, and soon after daybreak, as the road crossed a shoulder of the hill, they saw a plateau similar to that they had left, stretching out below them as far as the eye could reach. Even at the height at which they were standing, Roger could see that it was densely populated. Villages were scattered thickly, and the forest was restricted to patches, here and there, the greater portion of the land being under cultivation. Directly in front rose the lofty buildings and temples of a town of considerable size. Seen through the clear mountain air it seemed but three or four miles away, and Roger had difficulty in believing the merchants, when they assured him that it was fully twenty. This was Tepeaca.