I have now alleged, in a cursory manner, my principal reasons for considering civilizations as specifically distinct. To further dilate upon the subject, though I greatly desire to do so, would carry me too far; not, indeed, beyond the scope of the inquiries proposed in this volume, but beyond the limited space assigned for my introduction. I shall add only, that--assuming the intellectual equality of all branches of the human family--we can assign no causes for the differences of _degree only_ of their development. Geographical position cannot explain them, because the people who have made the greatest advance, have not always been the most favorably situated. The greatest geographical advantages have been in possession of others that made no use of them, and became of importance only by changing owners. To cite one of a thousand similar instances. The glorious Mississippi Valley, with its innumerable tributary streams, its unparalleled fertility and mineral wealth, seems especially adapted by nature for the abode of a great agricultural and commercial nation. Yet, the Indians roamed over it, and plied their canoes on its rivers, without ever being aware of the advantages they possessed. The Anglo-Saxon, on the contrary, no sooner perceived them than he dreamed of the conquest of the world. We may therefore compare such and other advantages to a precious instrument which it requires the skill of the workman to use. To ascribe differences of civilizations to the differences of laws and political institutions, is absolutely begging the question, for such institutions are themselves an effect and an inherent portion of the civilization, and when transplanted into foreign soils, never prosper. That the moral and physical well-being of a nation will be better promoted when liberty presides over her councils than when stern despotism sits at the helm, no one can deny; but it is obvious that the nation must first be prepared to receive the blessings of liberty, lest they prove a curse.