Page:Historic highways of America (Volume 10).djvu/70

70 carrying off the water from the bases of walls, to prevent the action of frost on their foundations; and it was considered highly important that all foundations in masonry should be well pointed with hydraulic mortar to a depth of eighteen inches below the surface of the ground.

By the year 1818, travel over the first great road across the Allegheny Mountains into the Ohio Basin had begun.