Slate and granite beams were also employed for the bonds and ties of walls, also for ties in sharply curved walls, also for supporting the roofs over covered passages. The nearest point to the slate formation is seven miles in a north-easterly direction. It is believed that the long granite beams were brought from the Lumbo Rocks, one and three-quarter miles to the south, where a great quantity of exactly similar shaped beams are to be seen lying scattered round the high perpendicular column of granite, the sides of which split off into the shape of the long monoliths found on the Acropolis. • • • • • _Cement dadoes._—One of the discoveries made recently in clearing the lower portions of interior faces of walls from débris, which appears to have covered them for centuries, is that some portions of such walls have been found to be covered with the remains of excellent granite cement dadoes. This is particularly to be noticed on three walls of the _Sacred Enclosure_, on the south wall of _No. 11 Enclosure_, and at the _Little Enclosure_ and the _Upper Passage_ on the Acropolis, and in other ruins where portions of this dado still remain. These dadoes extended to a height of 7 ft., the cement being found in patches still intact and in the joints of the blocks to this height, the courses above this height being entirely free from traces of cement. In passages and narrow places great quantities of this cement lay on the original floors along the bottoms of the walls on either side, some fragments showing on their backs the ribbed markings of the courses up against which the cement had been pressed, also bevelled edges, as if from the top and ends of such dadoes. This was particularly the experience on clearing out the _Parallel Passage_ in the Elliptical Temple. It is possible that these dadoes had once facings of white soapstone clay, beautifully smoothed, for this was found on some fragments of such cement dadoes, and the facing, when cut with a knife, powdered exactly as soapstone does. It can be noticed by anyone that the lower portions of the walls which once had dadoes have their block faces somewhat roughly built as compared with the upper portions of the walls. This appears to suggest that the original builders, in erecting the wall, had calculated upon certain portions of the faces being covered with dadoes. These rougher surfaces would provide a better hold for the cement than would the smoother faces of the walls above. The cavities in the dry masonry of the main walls of the Elliptical Temple contain cooled air even at noontide, and this rushes out from between the courses with such a force as to make it impossible to light a match close to them, while it is a very easy matter to carry on a conversation through a wall 15 ft. thick and 32 ft. high.