The control and direction of a moving ship are very wonderful things; but the very ease with which they are exercised makes us overlook the magnitude of the achievement and the perfection of the means employed. It may seem absurd to speak of one man controlling and directing a great ship, but that is pretty nearly what happens sometimes; for sometimes the man at the wheel is the only man on board doing anything at all; and he is absolutely directing the entire ship. At such times (doubtless they are rare and short) the man at the wheel on board, say the _Vaterland_, is directing unassisted by any human being a mass of 65,000 tons, which is going through the water at a speed of 24 knots, or 27 miles, an hour, nearly as fast as the average passenger-train. In fact, it would be very easy to arrange on board the _Vaterland_ that this should actually happen; that everybody should take a rest for a few minutes, coal-passers, water-tenders, oilers, engineers, and the people on deck. And while such an act might have no particular value, _per se_, and prove nothing important, yet, nevertheless, a brief reflection on the possibility may be interesting, and lead us to see clearly into the essential nature of what is here called "directability." The man at the wheel on board the _Vaterland_, so long as the fires burn and the oil continues to lubricate the engines, has a power in his hands that is almost inconceivable. The ship that he is handling weighs more than the 870,000 men that comprise the standing army of Germany. Now can anybody imagine the entire standing army of Germany being carried along at 27 miles an hour and turned almost instantly to the right or left by one man? The standing army of Germany is supposed to be the most directable organization in the world; but could the Emperor of Germany move that army at a speed of 27 miles an hour and turn it as a whole (not its separate units) through 90 degrees in three minutes?