The latter-day names of Mayan ruined buildings are usually unsatisfactory, and perhaps those of Uxmal are the most unsatisfactory of any. Taking the pyramid first, as being at once the largest and the most prominent feature of the ruined group, we find it to consist of a mound upwards of 80 feet high, 240 feet at the base and 160 feet wide. The platform-top of the pyramid measures about 23 feet by 80. The pyramid is built of rough stone and rubble, and was faced with stones flat-hewn, some of which are still in position. On the east side a stairway, steeper than that of Chichen, ascends to the top. The pyramid is crowned with a temple which measures some 70 feet by 12 and is three-roomed. This castillo at Uxmal is distinguished from those at Chichen and elsewhere by a unique feature, namely the building-out of a small edifice or temple some 20 feet below the level of the platform summit of the mound, and having its roof level with it. This building stands on a projecting platform of its own, on the west side of the pyramid, and originally communicated with the ground by a stairway 24 feet wide. It has one doorway, and its façade is more richly ornamented than that of any other building in the group, notable being the colossal "snouted mask" over the doorway. This rests upon a pedestal with two jaguar heads looking each way. The door lintels are sapota beams, which are to-day still in their places, as they were when Stephens visited the city in 1842. Separated from the pyramid by what appears to have been a small courtyard, is the Nunnery, a group of four buildings roughly forming a quadrangle, with passage-way at the corners; really four distinct buildings forming the sides of a large courtyard. Three of these edifices present a solid front externally, while that on the south, 279 feet long, has as its centre a gateway spanned by an arch, 10 feet 8 inches wide and some 15 feet high. The whole four buildings, though on slightly different levels, may be roughly said to stand on a terrace some 300 feet square. All the buildings have the walls plain and the entablature elaborately sculptured. That on the east had a centrepiece above the cornice; while that on the north was adorned with a false front, consisting of a series of triangular gables. In the scheme of decoration, the most notable features are the so-called snouted mask, which we found at Chichen, and the feathered serpent design. Between the Nunnery and the Castillo Stephens found what he called the House of Birds, because of its exterior being ornamented with rude representations of feathers and birds. To the south of the Nunnery quadrangle still stand the ruined walls of what was a tennis-court, such as we have described and illustrated at Chichen. Still further south stands the Governor's Palace, about 300 feet long, 40 feet wide, and some 25 feet high. It has eleven doorways in front and one at each end. The interior is longitudinally divided into two corridors which are in