Machiavel seems to have been the first writer who discovered the secret of what may be called _comparative history_. He it was who first sought in ancient history for the materials which were to illustrate the events of his own times, by fixing on analogous facts, similar personages, and parallel periods. This was enlarging the field of history, and opening a new combination for philosophical speculation. His profound genius advanced still further; he not only explained modern by ancient history, but he deduced those results or principles founded on this new sort of evidence which guided him in forming his opinions. History had hitherto been, if we except Tacitus, but a story well told; and by writers of limited capacity, the detail and number of facts had too often been considered as the only valuable portion of history. An erudition of facts is not the philosophy of history; an historian unskilful in the art of applying his facts amasses impure ore, which he cannot strike into coin. The chancellor D'Aguesseau, in his instructions to his son on the study of history, has admirably touched on this distinction. "Minds which are purely historical mistake a fact for an argument; they are so accustomed to satisfy themselves by repeating a great number of facts and enriching their memory, that they become incapable of reasoning on principles. It often happens that the result of their knowledge breeds confusion and universal indecision; for their facts, often contradictory, only raise up doubts. The superfluous and the frivolous occupy the place of what is essential and solid, or at least so overload and darken it that we must sail with them in a sea of trifles to get to firm land. Those who only value the philosophical part of history fall into an opposite extreme; they judge of what has been done by that which should be done; while the others always decide on what should be done by that which has been: the first are the dupes of their reasoning, the second of the facts which they mistake for reasoning. We should not separate two things which ought always to go in concert, and mutually lend an aid, _reason and example_! Avoid equally the contempt of some philosophers for the science of facts, and the distaste or the incapacity which those who confine themselves to facts often contract for whatever depends on pure reasoning. True and solid philosophy should direct us in the study of history, and the study of history should give perfection to philosophy." Such was the enlightened opinion, as far back as at the beginning of the seventeenth century, of the studious chancellor of France, before the more recent designation of _Philosophical History_ was so generally received, and so familiar on our title-pages.