vessels would contain a number of the small pottery figures which similar vessels from neighboring mounds had yielded. On removing the cover from the first one, however, it was found to contain nothing but a small quantity of impalpable dust. The second contained about an equal quantity of similar dust, together with a small rough opal. The excavation of this mound was continued to a depth of about 18 feet, but nothing further was discovered. The circular space inclosed within the earthwork was surfaced by a layer varying from 2 feet to 3 feet in thickness, resting on the bedrock, and composed of rubble and powdered marl beaten into a compact mass, covered by two layers of cement, one beneath the other, which formed a smooth level floor over the whole inclosure. A great part of the earthwork and the rubble from the floor of the inclosed space have been removed to repair the Corozal streets. Nothing, however, was found within them with the exception of a few broken flint axheads and spearheads, some hammerstones (which are found practically everywhere), fragments of obsidian knives, and quantities of potsherds. Plate 10 shows a section through the earthwork in process of removal at its western extremity. [Illustration: FIG. 20.--Pottery vessels from Mound No. 4.] The wall is 21 feet 8 inches in height at this point, though only about 17 or 18 feet are shown in the photograph, as the ground was filled up behind the men excavating by a heap of limestone dust 3 or 4 feet high, left after the stones had been removed. The wall is composed here from the ground up of--(1) a layer of small rubble, 18 inches in thickness, the stones composing which had apparently been picked off the land; (2) a layer of cement, 6 to 8 inches in thickness (the upper surface of this layer is continuous with the upper surface of the cement covering the inclosed space, and the two together evidently formed originally one continuous flat, smooth pavement); (3) a layer of large rough blocks of limestone, 8 feet in thickness, built in together with some care, but without the intervention of mortar (these blocks had evidently been quarried out especially for this purpose, as they were quite fresh and showed no signs of weathering); (4) a cement layer 3 feet in thickness, composed of alternate thin layers of bluish gray cement and thick layers of yellowish cement, which can be faintly seen in the photograph. At the point B, plate 10, were found a quantity of ashes and small pieces of charred wood; the large stones in the neighborhood were also blackened by the action of fire, and ashes were mixed with the lower part of the cement layer, which would seemingly indicate that a large fire, lasting a considerable period, had been kept up at this point on top of layer c before the cement capping was added. The top layer, 8 feet high, is composed of loose, friable mortar with rough blocks of limestone set in it irregularly and finished with a conical cap.