long and one hundred feet nigh, that immense neck of land which separates the base of the first level portion of the Cordilleras from the plains of the terra caliente, or the hot country. This bridge, the mason-work of which is entirely finished, only lacks the iron floor in order to be open to the public. Having passed this great work, we arrive, by a series of curves as boldly as scientifically run, at the great bridge of San Alejo, which is not as high as that of Paso de Macho, but several feet longer. From San Alejo to Chiquihuite there is nothing but deep cuts through the solid rock, and enormous terrepleins, making the great inequalities of that broken ground entirely disappear. Chiquihuite Bridge, which is over three hundred feet long, is elevated more than one hundred and fifty feet above that abyss, where the foaming, cold stream that gives its name to this part of the mountain, forever leaps and boils. The boldest spirit would not suspect the real tours de force conceived in the running of this road accomplished by the skill of Mr. Buchanan, and completed under the direction of Mr. Branniff, chief of construction.
"On leaving the bridge, the road follows the main highway for some distance, by a terreplein of sixty feet high, supported by a wall ten feet thick, and suddenly, as in the shifting of scenes in a theatre, the road runs around the mountain, suspended on its sides. It was necessary to cut it through solid rock, of which the side of this mountain is composed. The laborers engaged in this unequal piece of work have to hold on to the rocks, and are held up by ropes, which makes them resemble, at a distance, bees in a honey-comb. The road continues for about one hundred metres along
