Pizarro now sent orders to his brother to follow without delay; and, after refreshing his men, continued his toilsome ascent, and before nightfall reached an eminence crowned by another fortress, of even greater strength than the preceding. It was built of solid masonry, the lower part excavated from the living rock, and the whole work executed with skill not inferior to that of the European architect. *1 [Footnote 1: "Tan ancha la Cerca como qualquier Fortaleca de Espana, con sus Puertas: que si en esta Tierra oviese los Maestros, i Herramientas de Espana, no pudiera ser mejor labrada la Cerca." Xerez, Conq. del Peru, ap. Barcia, tom. III. p. 192.] Here Pizarro took up his quarters for the night. Without waiting for the arrival of the rear, on the following morning he resumed his march, leading still deeper into the intricate gorges of the sierra. The climate had gradually changed, and the men and horses, especially the latter, suffered severely from the cold, so long accustomed as they had been to the sultry climate of the tropics. *2 The vegetation also had changed its character; and the magnificent timber which covered the lower level of the country had gradually given way to the funereal forest of pine, and, as they rose still higher, to the stunted growth of numberless Alpine plants, whose hardy natures found a congenial temperature in the icy atmosphere of the more elevated regions. These dreary solitudes seemed to be nearly abandoned by the brute creation as well as by man. The light-footed vicuna, roaming in its native state, might be sometimes seen looking down from some airy cliff, where the foot of the hunter dared not venture. But instead of the feathered tribes whose gay plumage sparkled in the deep glooms of the tropical forests, the adventurers now beheld only the great bird of the Andes, the loathsome condor, who, sailing high above the clouds, followed with doleful cries in the track of the army, as if guided by instinct in the path of blood and carnage. [Footnote 2: "Es tanto el frio que hace en esta Sierra, que como los Caballos venian hechos al calor, que en los Valles hacia, algunos de ellos se resfriaron." Ibid., p. 191.] At length they reached the crest of the Cordillera, where it spreads out into a bold and bleak expanse, with scarce the vestige of vegetation, except what is afforded by the pajonal, a dried yellow grass, which, as it is seen from below, encircling the base of the snow-covered peaks, looks, with its brilliant straw-color lighted up in the rays of an ardent sun, like a setting of gold round pinnacles of burnished silver. The land was sterile, as usual in mining districts, and they were drawing near the once famous gold quarries on the way to Caxamalca; "Rocks rich in gems, and mountains big with mines, That on the high equator ridgy rise."