Humboldt says, that he saw at Pullal three houses made of stone, which were built by the Incas, (kings,) each of which was more than fifty meters, or a hundred and fifty feet long, laid in a cement, or true mortar. This fact, he says, deserves attention, because travellers who had preceded him had unanimously overlooked this circumstance, asserting that the Peruvians were unacquainted with the use of mortar, but this is erroneous. The Peruvians not only employed a mortar in the great edifices of Pacaritambo, but made use of a cement of _asphaltum_; a mode of construction which, on the banks of the Euphrates and the Tigris, may be traced back to the remotest antiquity. The tools made use off to cut their stone were of copper, hardened with tin, the same metal used among the Greeks and Romans, and other nations. To show the genius and enterprise of the natives of Mexico, before America was last discovered, we give the following as but a single instance: Montezuma, the last king but one of Mexico, A. D. 1446, forty-six years before the discovery of America by Columbus, erected a dike to prevent the overflowing of the waters of certain small lakes in the vicinity of their city, which had several times deluged it. This dike consisted of a bank of stones and clay, supported on each side by a range of palisadoes; extending in its whole length about seventy miles, and sixty-five feet broad, its whole length sufficiently high to intercept the overflowings of the lakes in times of high water, occasioned by the spring floods. In Holland, the Dutch have resorted to the same means to prevent incursions of the sea; and the longest of the many is but forty miles in extent, nearly one half short of the Mexican dike. “Amidst the extensive plains of Upper Canada, in Florida, near the gulf of Mexico, and in the deserts bordered by the Orinoco, in Colombia, dikes of a considerable length, weapons of brass, and sculptured stones, are found, which are the indications that those countries were formerly inhabited by industrious nations, which are now traversed only by tribes of savage hunters.”—[PRIEST.] * * * * * ANCIENT LANGUAGES OF THE FIRST INHABITANTS OF AMERICA. _Letter to M. Champollion, on the Graphic Systems of America, and the Glyphs of Otolum or Palenque, in Central America._—_By_ C. S. RAFINESQUE. You have become celebrated by deciphering, at last, the glyphs and characters of the ancient Egyptians, which all your learned predecessors had deemed a riddle, and pronounced impossible to read. You first announced your discovery in a letter. I am going to follow your footsteps on another continent, and a theme equally obscure; to none but yourself can I address with more propriety letters on a subject so much alike in purpose and importance, and so similar to your own labors.