It will be easy now to see why it is that the commercial policy of England has always been so diametrically opposed to that advocated by the author of _The Wealth of Nations_. He saw clearly that the man and the easily transported spindle should go to the food and the cotton, and that, when once there, 'they were there for ever; whereas the bulky food and cotton might be transported to the man and the spindle for a thousand years, and that the necessity for transportation in the thousand and first would be as great as it had been in the first; and that the more transportation was needed, the less food and cloth would fall to the share of both producer and consumer. His countrymen denied the truth of this, and from that day to the present they have endeavoured to prevent the other nations of the world from obtaining machinery of any kind that would enable them to obtain the aid of those natural agents which they themselves regard as more useful than the earth itself. "The power of water," says Mr. McCulloch-- "And of wind, which move our machinery, support our ships, and impel them over the deep--the pressure of the atmosphere, and the elasticity of steam, which enables us to work the most powerful engines, are they not the spontaneous gifts of nature? Machinery is advantageous only because it gives us the means of pressing some of the powers of nature into our service, and of making them perform the principal part of what, we must otherwise have wholly performed ourselves. In navigation is it possible to doubt that the powers of nature--the buoyancy of the water, the impulse of the wind, and the polarity of the magnet--contribute fully as much as the labours of the sailor to waft our ships from one hemisphere to another? In bleaching and fermentation the whole processes are carried on by natural agents. And it is to the effects of heat in softening and melting metals, in preparing our food, and in warming our houses, that we owe many of our most powerful and convenient instruments, and that those northern climates have been made to afford a comfortable habitation."--_Principles_, 165.