"There were ideas of balance in the governments of his time which Newton felt, and political thought is bound to Newtonian science in the work of Newton himself. Politics, said Woodrow Wilson, is turned into mechanics under the touch of Montesquieu. The principle of unity depended, for each system, upon some single law. The law of gravitation swung the worlds, keeping the free bodies in their places, reined to their courses with order and precision. The poise and balance of forces gave the universe its unity, one of symmetry and perfect adjustment. Wilson says, "The government of the United States was constructed upon the Whig theory of political dynamics, which was a sort of unconscious copy of the Newtonian theory of the universe." And, again, "The trouble with the theory is that government is not a machine, but a living thing. It falls, not under the theory of the universe, but under the theory of organic life." Having described one fallacy, Wilson goes on toward another: he would hope that we would substitute the science of Darwin for the science of Newton."