The ‘Codice Goupil’ was probably a translation into Spanish of an earlier Aztec text. The picture of the great Teocalli is given on Plate D. * * * * * The positions of the Palace of Montezuma, the Palace of Tlillancalqui, the Cuicacalli or Dance House, and the old Palace of Montezuma have been defined by various writers and are now generally accepted. The principal difficulty arises in defining the area of the Temple Enclosure and the position and orientation of the Teocalli of Huitzilopochtli. THE TEMPLE ENCLOSURE. The Temple Enclosure was surrounded by a high masonry wall (Anon., Torq., Moto.) known as the Coatenamitl or Serpent Wall, which some say was embattled (Torq. quoting Sahagun, Moto.). There were four principal openings (Anon., Torq., Moto., Duran) facing the principal streets or causeways (Torq., Moto., Duran). (Tezozomoc alone says there were only three openings—east, west and south—and three only are shown on Sahagun’s plan.) “It was about 200 _brazas_ square” (Sahagun), _i. e._ about 1013 English feet square. However, Sahagun’s plan (Plate C) shows an oblong. As the four openings faced the principal streets or causeways, the prolongation of the line of the causeways of Tacuba and Iztapalapa must have intersected within the Temple Enclosure. This intersection coincides with junction of the modern streets of Escalerillas, Relox, Sta. Teresa, and Seminario (see Plate A). We have now to consider the boundaries of the Temple Enclosure, and this can best be done by establishing the positions of the Temple of Tezcatlipoca and the Palace of Axayacatl. =The Temple of Tezcatlipoca.= (Tracing A_{2}.) (DURAN, ch. lxxxiii.) “This Temple was built on the site (afterwards) occupied by the Archbishop’s Palace, and if anyone who enters it will take careful notice he will see that it is all built on a terrace without any lower windows, but the ground floor (primer suelo) all solid.” This building is also mentioned in the 2nd Dialogue of Cervantes Salazar[1], where, in reply to a question, Zuazo says:—“It is the Archbishop’s Palace, and you must admire that first story (primer piso) adorned with iron railings which, standing at such a height above the ground, rests until reaching the windows on a firm and solid foundation.” To this Alfaro replies:—“It could not be demolished by Mines.” The Arzobispado, which still occupies the same site in the street of that name, must therefore have been originally built on the solid foundation formed by the base of the Teocalli of Tezcatlipoca. =The Palace of Axayacatl.= (Tracing A_{2}.) (‘Descripción de las dos Piedras, etc.,’ 1790, by Don ANTONIO DE LEON Y GAMA. Bustamante, Edition ii. p. 35.)