what a jump the mechanical arts have made!
These primitive elements are now so intricately combined that we can
hardly recognize them; new forces have been added, new principles
evolved; ponderous engines, like moving mountains of iron, shake the
very earth; many-windowed factories, filled with complex machinery
driven by water or its vapor, clatter night and day, weaving the plain
garments of the poor man and the rich robes of the prince, the curtains
of the cottage and the upholstery of the palace.

Once there were but the spear and bow and shield, and hand-to-hand
conflicts of brute strength. See now the whole enginery of war, the art
of fortification, the terrific perfection of artillery, the mathematical
transfer of all from the body to the mind, till the battlefield is but
a chess-board, and the battle is really waged in the brains of the
generals. How astonishing was that last European field of Solferino,
ten miles in sweep,--with the balloon floating above it for its spy
and scout,--with the thread-like wire trailing in the grass, and
the lightning coursing back and forth, Napoleon's ubiquitous
aide-de-camp,--with railway-trains, bringing reinforcements into the
midst of the _melee_, and their steam-whistle shrieking amid the
thunders of battle! And what a picture of even greater magnificence, in
some respects, is before us to-day! A field not of ten, but ten
thousand miles in sweep! McClellan, standing on the eminence of present
scientific achievement, is able to overlook half the breadth of a
continent, and the widely scattered detachments of a host of six hundred
thousand men. The rail connects city with city; the wire hangs between
camp and camp, and reaches from army to army. Steam is hurling his
legions from one point to another; electricity brings him intelligence,
and carries his orders; the aeronaut in the sky is his field-glass
searching the horizon. It is practically but one great battle that is
raging beneath him, on the Potomac, in the mountains of Virginia,
down the valley of the Mississippi, in the interiors of Kentucky and
Tennessee, along the seaboard, and on the Gulf coast. The combatants are
hidden from each other, but under the chieftain's eye the dozen armies
are only the squadrons of a single host, their battles only the separate
conflicts of a single field, the movements of the whole campaign only
the evolutions of a prolonged engagement. The spectacle is a good
illustration of the day. U