Xochicalco means “In the House of Flowers.” The word “flower,”—_xochitl_,—is often a part of the names of Mexican places and people, such as the lake of Xochimilco—“In the Flower-plantation.” _Tlilxochitl_, literally “black flower,” is the Aztec name for vanilla, so that the name of that famous Mexican historian, Ixtlilxochitl, whose name sticks in the throats of readers of Prescott, means “Vanilla-face.” Why the place was called “In the House of Flowers” is not clear. The usual explanation seems not unlikely, that it was because offerings of flowers and first-fruits were made upon its shrines. The Toltecs, say the Mexican chroniclers, did not sacrifice human victims; and it was not until long after other tribes had taken possession of their deserted temples, that the Aztecs introduced the custom by sacrificing their prisoners of war. It seems odd, however, that one of the Toltec kings should have been called Topiltzin, which was the title of the chief priest among the Aztecs, whose duty it was to cut open the breasts of the human victims and tear out their hearts. The Indians always delighted in carrying flowers in their solemn processions, crowning themselves with garlands, and decorating their houses and temples with them; and, while they worshipped their gods according to the simple rites which tradition says their prophet, Quetzalcoatl, (“Feathered Snake,”) appointed, before he left them and embarked in his canoe on the Eastern ocean, no name could have been more appropriate for their temple. This pleasant custom did not disappear after the Conquest; and to this day the churches in the Indian districts are beautiful with their brilliant garlands and nosegays, and are as emphatically “houses of flowers” as were the temples in ages long past. Since writing the above notice of the Pyramid of Xochicalco, I have come upon a new piece of evidence, which, if it may be depended on, proves more about the history of this remarkable monument than all the rest put together. Dupaix made a drawing of the ruins at Xochicalco in 1805, which is to be found in Lord Kingsborough’s ‘Antiquities of Mexico,’ and among the sculptures of the upper tier of blocks is represented a reed, with its leaves set in a square frame, with three small circles underneath; the whole forming, in the most unmistakable way, the sign 3 Acatl (3 Cane) of the Mexican Astronomical Calendar. Now it must be admitted that Dupaix’s drawing of these ruins is most grossly incorrect; but still no amount of mere carelessness in an artist will justify us in supposing him to have invented and put in out of his own head a design so entirely _sui generis_ as this. It does not even follow that the drawing is wrong because the sign may not be found there now; for it was in an upper tier, and no doubt many stones have been removed since 1805, for building-purposes.