Next it traversed the precipitous side of a hill for a distance of three or four miles, where Nature had not afforded foothold for a rabbit or a squirrel.

The stupendous bridges and the magnificent open road cut in the side of the rock, its roof supported on the inside by the hill itself, on the outside by pillars left at regular intervals when the stone was cut, formed from one point a single splendid view.

Pointing it out to Enva, I was a little surprised to find her capable, under the guidance of a few remarks from myself, of appreciating and taking pride in the marvellous work of her race.

In another place, a tunnel pierced directly an intervening range of hills for about eight miles, interrupted only in two points by short deep open cuttings.

This passage, unlike those on the river previously mentioned, was constantly and brilliantly lighted.