text:  As an elucidation let us suppose that the usual route to the same destination round Gape Horn from a more central part of the Union--Philadelphia for example--is 16 150 miles; in that case the distance saved independent of less sea risk would be as follows:--From the Delaware to Guassacualco 2100 miles; across Tehuantepec to the Pacific 120; to the Sandwich Islands 3835; to the Ladrone do