Between the upper end of the Grand Gallery (G. G.) and the King's Chamber is a small antechamber (H), its extreme length 9 feet, its extreme width 5 feet, and its extreme height 12 feet, with its walls grooved far purposes now unknown. In the groove nearest the Grand Gallery is a slab of stone in two sections, with a peculiar boss or knob protruding about an inch from the surface of the upper part facing the Grand Gallery. This stone does not reach to the floor of the antechamber and those entering the King's Chamber must pass under the slab. From the King's Chamber, the Grand Gallery--157 feet in length, 28 feet in height, 7 feet in width at its widest point and decreasing to 3½ feet as the result of seven converging overlaps, of the stones forming the walls--descends to a little above the level of the Queen's Chamber. Here a gallery (E) branches off, passing mere than 100 feet back towards the center of the Pyramid and opening into the Queen's Chamber (F). The Queen's Chamber is 19 feet long, 17 feet wide, and 20 feet high. Its roof is peaked and composed of great slabs of stone. Air passages not shown lead from the Queen's Chamber, but these were not open originally. In the east wall of the Queen's Chamber is a peculiar niche of gradually converging stone, which in all likelihood, may prove to be a new lost entrance way.