It is remarkable how one tidal wave of investigation after another has, at different eras, invaded and receded from these regions, carrying from them more or less of the fragments of their architectural, monumental, and pictorial records—the sources of doubtful and unsatisfactory interpretation. The Spanish chroniclers; the scientists of the period of Humboldt and his contemporaries; the French government and the learned societies of France, uniting their efforts to render effective the honest but undisciplined enthusiasm of Brasseur de Bourbourg; all have experienced a subsidence of interest arising mainly from a want of success in yielding a sufficiently plausible solution of a mysterious subject. The death of Brasseur, the fall of Maximilian, and the political distractions of the French government and people, are not alone the causes of suspended action on the part of the learned bodies of France. They deemed it prudent to discredit the judgment and correctness of their own agent. One at least of Brasseur’s Commission publicly disavowed responsibility for his opinions; and his attempt to interpret the Codex Troano by means of the alphabet of Bishop Landa was pronounced by themselves to be a failure. How signally the explorations of Del Rio, of Dupaix, of Galindo, and of De Waldeck, failed to make a permanent impression on the public mind! How soon the illustrated narrative of Stephens became in a measure disregarded, and even his reliableness questioned! How completely the nine ponderous folios of Lord Kingsborough’s extensive collection fell dead from the press, until the great work to which he had devoted his life and his entire fortune sold in the market for less than a single useless production of Increase or Cotton Mather! We have seen the elaborate and learned essays of Gallatin upon Mexican civilization slumbering with the long sleep of the Ethnological Society; the Geographical Society cautious about travelling out of the routes of regular expeditions; even the sardonic “Nation,” assumed arbiter in literature, politics, and science, and always ready for caustic criticism, hesitating to venture far beneath the surface of these important inquiries. The ill-fated Berendt has perished in the midst of his unfinished labors; and, lastly, one of the most purely philosophical investigators of Indian habits and history reasons in a direction opposed to the antiquity and extent of aboriginal civilization.