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Having watered it well and kept the ground loose through hoe or spade, suppose that when a few weeks have passed the outline of a smokestack should push through the soil, to be followed a little later by a rudimentary steam whistle, the outlines of a boiler, and, rising through the sod, rude drive-wheels, piston-rods and cylinders, until after six months the great engine should stand forth in full completion.
The first steam locomotive that we know about, like that of Stephenson, was a crude mechanism with a primitive boiler and steam-chest and drive-wheels, and as a whole it had but a low degree of efficiency measured by our modern standard; but as time went on inventive genius changed one little part after another until greater and greater efficiency was obtained, and at the present time we find many varied products of locomotive evolution.
Everything is waiting and ready. First we will get the men together who have the fire. Then we will put fire under the boilers of the nation and turn the drive-wheels of a world.
Each one has evolved by transformations of its various parts, and in its evolution it has become adapted or fitted to peculiar circumstances. We do not expect the freight locomotive with its eight or ten powerful drive-wheels to carry the light loads of suburban traffic, nor do we expect to see a little switch engine attempt to draw "the Twentieth Century Limited" to Chicago.
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