The copper ore, which
requires a very large quantity of fuel for its reduction, is sent
by sea to the coalfields of Wales, and is smelted at Swansea;
whilst the vessels which convey it, take back coals to work the
steam-engines for draining the mines, and to smelt the tin, which
requires for that purpose a much smaller quantity of fuel than
copper.
278. Rivers passing through districts rich in coal and
metals, will form the first highroads for the conveyance of
weighty produce to stations in which other conveniences present
themselves for the further application of human skill. Canals
will succeed, or lend their aid to these; and the yet unexhausted
applications of steam and of gas, hold out a hope of attaining
almost the same advantages for countries to which nature seemed
for ever to have denied them. Manufactures, commerce, and
civilization, always follow the line of new and cheap
communications. Twenty years ago, the Mississippi poured the vast
volume of its waters in lavish profusion through thousands of
miles of countries, which scarcely supported a few wandering and
uncivilized tribes of Indians.
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