Among the settlers in the Transvaal in the later seventies were two brothers called Struben, who had had some experience, though not much success, with the gold-seekers at Lydenburg, and who took up in 1884 the farm of Sterkfontein in the Witwatersrandt district. While attending to the farm they kept their eyes open for gold, and one day one of the brothers came upon gold-bearing conglomerates, which they followed up until they struck the famous 'Confidence Reef.' This remarkable reef at one time yielded as much as a thousand ounces of gold and silver to the ton of ore, and then suddenly gave out, being in reality not a 'reef' but a 'shoot.' There were other prospectors in the district, but none had struck it so rich as the Strubens, who purchased the adjacent farm to their own, and set up a battery to crush quartz, both for themselves and for the other gold-hunters. The farms were worth little in those days, being only suitable for grazing; but when prospectors and company promoters began to appear, first by units, then by tens, and then by hundreds, the Boers put up their prices, and speedily realised for their holdings ten and twenty times what they would have thought fabulous a year or two previously. And it was on one of these farms that the city of Johannesburg was destined to arise as if under a magician's wand, from a collection of huts, in eight years, to a city covering an area three miles by one and a half, with suburbs stretching many miles beyond, with handsome streets and luxurious houses, in the very heart of the desert. [Illustration: Prospecting for Gold.] It was one Sunday evening in 1886 that the great 'find' was made which laid the base of the prosperity of the Johannesburg-to-be. A farm-servant of the brothers Struben went over to visit a friend at a neighbouring farm, and as he trekked homeward in the evening, knocked off a bit of rock, the appearance of which led him to take it home to his employer. It corresponded with what Struben had himself found in another part, and following up both leads, revealed what became famous as the Main Reef, which was traced for miles east and west.