At the junction of the Lotsani river with the Limpopo he found two sets of ruins and several shapeless masses of stones, not far from a well-known spot where the Limpopo is fordable. Both of these are of the same workmanship as the Zimbabwe buildings, though not quite so carefully constructed as the big temple; the courses are regular, and the battering back of each successive course and the rounding of the ends of the walls are very cleverly done. The walls are built of the same kind of granite and with holes at the doorways for stakes as at Zimbabwe. But what is most important, Mr. Swan ascertained that the length of the radius of the curves of which they are built is equal to the diameter of the Lundi temple or the circumference of the great round tower at Zimbabwe. He then proceeded to orientate the temple, and as the sun was nearly setting he sat on the centre of the arc, and was delighted to find that the sun descended nearly in a line with the main doorway; and as it was only seventeen days past the winter solstice, on allowing for the difference in the sun’s declination for that time, he found that a line from the centre of the arc through the middle of the doorway pointed exactly to the sun’s centre when it set at the winter solstice. The orientation of the other ruin he found was also to the setting sun. ‘This,’ writes Mr. Swan, ‘places our theories regarding orientation and geometrical construction beyond a doubt.’ Continuing his journey northwards, Mr. Swan found two sets of ruins in the Lipokole hills, four near Semalali, and one actually 300 yards from the mess-room of the Bechuanaland Border Police at Macloutsie camp. Owing to stress of time Mr. Swan was not able to visit all the ruins that he heard of in this locality, but he was able to fix the radii of two curves at the Macloutsie ruin, and four curves at those near Semalali, and he found them all constructed on the system used at Zimbabwe. The two ruins on the Lipokole hills he found to be fortresses only, and not built on the plan of the temples. The temples consist generally of two curves only, and are of half-moon shape, and seem never to have been complete enclosures; they are all built of rough stone, for no good stone is obtainable, yet the curves are extremely well executed, and are generally true in their whole length to within one or two inches. Further up country, on the ’Msingwani river, Mr. Swan found seven sets of ruins, three of which were built during the best period of Zimbabwe work. He measured three of the curves here, and found them to agree precisely with the curve system used in the construction of the round temple at Zimbabwe, and all of them were laid off with wonderful accuracy.