Mr. Madison remarked to me, that the United States had been “useful in proving things before held impossible.” Of such proofs, he adduced several. Others, which he did not mention, have since occurred to me; and, among them, the pursuit of the à priori method in forming a constitution:–the à priori method, as it is styled by its enemies, though its advocates, with more reason, call it the inductive method. Till the formation of the government of the United States, it had been generally supposed, and it is so still by the majority of the old world, that a sound theory of government can be constructed only out of the experience of man in governments; the experience mankind has had of despotisms, oligarchies, and the mixtures of these with small portions of democracy.