The most important feature in the interior of the temple is, of course, the great tower, which is a marvel of workmanship in rough material, and in the truth of its lines almost as wonderful as the column of a Greek temple. We could at first discover no reason for its being built in its peculiar position. It has not been placed with any reference to the points of the compass nor to the bearing of the sun at the equinoxes, and its position is only indirectly connected with the position of the sun at the solstices. But it is in the middle of the space marked off by the two inner doorways, and the more easterly of these two doorways is at the point where the sun would appear when rising at the summer solstice when regarded from the central altar, as will be shown farther on; and the other doorway is at the point where the decoration on the outer wall terminates, and that is at the part of the wall where the sun’s rays would be tangential to its curve when rising at the same solstice. The portion of the outer wall behind the above-mentioned sacred enclosure is built in the form of a circular arc with its two extremities at B and K, and its centre at P, and the tower stands midway between these points. Close to the great tower is the little one, and no reason for its position suggests itself; but the relative proportions of the two towers are curious, and seem to offer an explanation of the plan of some other parts of the building—in fact, the diameter of the great tower seems to have represented the unit of measure in the construction of the curves of the outer walls and of all the regularly curved inner walls in the great temple, and in all the well-built temples in Mashonaland. The diameter of the great tower at its base is 17·17 feet or 10 cubits, [9] and this is exactly equal to the circumference of the little tower. This ratio of circumference to diameter and the above measure of 10 cubits seem together to have determined either the length of the radius or diameter, or halves of these, of all the circular curves on which many of the walls are built. For instance, the radius of the curve behind the great tower is 169⅓ feet, and this is equal to the diameter of the great tower multiplied by the square of the ratio of circumference to diameter; or 17·17 × 3·142 = 169·34. The well-built partly circular enclosure to the north-west of the tower has a diameter of 54 feet, and this is equal to 17·17 × 3·14. The curve of the outer wall, from the eastern end of the sacred enclosure (at K) to A is circular, and has its centre at the altar, and its radius is 107⅘ feet. This is equal to twice 17·17 × 3·14. This length of 107⅘ feet is also the exact distance between the middle points of the two doorways at either end of the sacred enclosure. The curve of the outer wall from A to the great doorway seems to have a similar radius to the arc behind the tower, namely, 169⅓ feet, but in our measurements there we hardly fixed a sufficient