number of points in the line of the wall to make quite certain of this. The inner long wall is parallel to the outer one until it reaches the sacred enclosure, so it may be considered as combined with the outer wall for our present purpose. Besides these there are no well-built curved walls in the great temple, except the piece of wall near the monoliths at M, and it is too short to allow of the centre of its curve being laid down with certainty of accuracy. It does not, however, seem to belie this system of measurement. We need hardly expect to find the same measure always applying to the buildings on the hill, for the form of these buildings is often controlled by the nature of the ground. Still they do apply, and the diameter of the curve on which the wall of the eastern temple is built is 84½ feet, which is equal to half of 17·17 × 3·142. Of the two curved walls on the left hand when entering this temple from the south the diameter of the curve of one is equal to 17·17 × 3·14, and the radius of the other is 17·17 feet. The only other regularly curved wall on the hill is the western great wall with monoliths and round towers, and the diameter of the circle of which the curve of this wall forms a part is 254 feet, and this does not agree with our system of measure. But this wall and its towers are not well built, and there is good reason to suppose that it is not the original wall, or that the outer portion of it is not original; and, in fact, we discovered the foundation of part of another parallel wall, as is partly shown in plan, six feet west of this wall. If this were the original wall, it would give a diameter of 266 feet for the circle, which is half of 17·17 × 3·143. At Matindela the only regularly curved piece of wall is that about the principal doorway, but it is so rough in its construction that one hesitates to deal with it, and we can only say that it seems to be built on a curve of 107⅘ feet radius = twice 17·17 × 3·14. The whole appearance of this wall and the slight inaccuracies in the orientation of the decorations which it carries, suggest that it is a more recent wall built roughly as a copy of an original wall on the same foundation. The ruin at the Lundi River is circular in form and well built, and its diameter is fifty-four feet, which is equal to 17·17 × 3·14. Of course all the above measurements refer to the outside of the walls at the base, as this is the way in which the tower itself was measured.