Over this interesting deposit there is a large wood with limestones cropping up above the soil. Upon one of them I saw several loose egg-shaped stones, and others perfectly round, the size of a sparrow's egg, lying on the ground close to the rock. On stopping to pick them up I found the stone full of them, some half buried, others only holding by a small part of the ball fixed to the rock. Thinking it a very interesting specimen I went to my waggon for a hammer, and secured one of the projecting parts of the rock that had some of these balls imbedded in it, and a dozen of the loose balls, which have been carefully preserved to be examined by a geologist when time will permit, to ascertain if this singular formation is limestone or not, as every portion of this limestone formation is black except where the bones are found, and there it is of a light-brown colour. It is also found in all the dark rocks in the same locality. Extensive tracts of country in South Central Africa have similar rocks containing crystallised globules, which when broken are hollow, which leads me to suppose this rock is not a limestone formation. Dr. Lyle, the geologist, at Pretoria, examined the rock with bones in it, and pronounced it a kind of lava impregnated with lime from the bones. In the neighbourhood of Lydenburg, to the north, are many extensive caves, some extending for nearly a mile underground, that have been formed by the small stream of water that flows through most of them, with beautiful stalactite hanging from their roofs and sides. A short distance to the west of these were the strongholds of the chiefs Secoeme and Mampoer. These mountains are completely riddled with caves, and are places of great strength, and surrounded by many Kaffir kraals, under several petty chiefs. The most noted are Magali, Manpartella, Secocoene, Matebe, Maselaroon (Queen), Mapok, Mamalube, Umsoet, Moripi, Umlindola, Majaje (Queen), Maffafare, Mayaya, and others, numbering many thousands in all. During the Secocoene war, in 1878, I was through that country, travelling up from Pretoria with a detachment of the 80th Regiment, and visited the magnet heights, a range of hills composed entirely of loadstone of highly magnetic power. It is about forty miles to the north-west of Lydenburg.