coast and extended northward to the
equator. These roads were built on beds or "deep under-structures" of
masonry. The width of the roadways varied from twenty to twenty-five
feet, and they were made level and smooth by paving, and in some places
by a sort of macadamizing with pulverized stone mixed with lime and
bituminous cement. This cement was used in all the masonry. On each side
of the roadway was "a very strong wall more than a fathom in thickness."
These roads went over marshes, rivers, and great chasms of the sierras,
and through rocky precipices and mountain sides. The great road passing
along the mountains was a marvelous work. In many places its way was cut
through rock for leagues. Great ravines were filled up with solid
masonry. Rivers were crossed by means of a curious kind of suspension
bridges, and no obstruction was encountered which the builders did not
overcome. The builders of our Pacific Railroad, with their superior
engineering skill and mechanical appliances, might reasonably shrink
from the cost and the difficulties of such a work as this. Extending
from one degree north of Quito to Cuzco, and from Cuzco to Chili, it was
quite as long as the two Pacific railroads, and its wild route among the
mountains was far more difficult.

Sarmiento, describing it, said, "It seems to me that if the emperor
(Charles V.) should see fit to order the construction of another road
like that which leads from Quito to Cuzco, or that which from Cuzco goes
toward Chili, I certainly think he would not be able to make it, with
all his power." Humboldt examined some of the remains of this road, and
described as follows a portion of it seen in a pass of the Andes,
between Mansi and Loxa: "Our eyes rested continually on superb remains
of a paved road of the Incas. The roadway, paved with well-cut, dark
porphyritic stone, was twenty feet wide, and rested on deep foundations.
This road was marvelous. None of the Roman roads I have seen in Italy,
in the South of France, or in Spain, appeared to me more imposing than
this work of the ancient Peruvians." He saw remains of several other
shorter roads which were built in the same way, some of them between
Loxa and the River Amazon. Along these roads at equal distances were
edifices, a kind of caravanseras, built of hewn stone, for the
accommodation of travelers.

These great works were described by every Spanish writer on Peru, and in
some accounts of them we find suggestions in