Take,
for instance, the development of the "Great American Desert." Who
projected its irrigation, by which areas have been redeemed from
barrenness and waste? Who planned the economic use of the Niagara Falls?
Who built the Brooklyn Bridge? Who projected the vast waterway from
Chicago to the Gulf? Who first thought of a cable across the depths of
seas? Who bridged the Firth of Forth, the Ganges, the Mississippi? Who
projected the gray docks of Montreal? the Simplon Tunnel? Who wound the
iron rails across the Alleghanies, the Rockies, the Sierras? Who drew
the wall that has encircled China for a thousand years? Who projected
the Suez Canal? the Trans-Siberian Railway? Who sunk the mines of
Eldorado? Who designed the Esplanade at Hamburg? the stone banks of the
Seine? the waterways of Venice? the aqueducts of Rome? the Appian Way?
the military roads of Chili and Peru? the Subway in New York?
Gravity, stress, strain, weight, tension, sag, cohesion,--a few
mathematical formulas, and a knowledge of the primary laws of
physics,--upon such principles as these, the world is rapidly changing
form and use.
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