Both Rhodes and Barnato acquired immense wealth by their investments, but it is doubtful if either gained much happiness from his acquisitions. Poor Barnato! He had gained riches and stood among the foremost financiers of the world, but at how fearful a cost! His overtaxed brain began to give way, and on his way back to England he suddenly leaped overboard and was drowned. Cecil Rhodes was instrumental in enlarging British influence and territory in South Africa, and to him England owes a deep debt of gratitude. He died in 1902 leaving a portion of his immense fortune for scholarships in Oxford, England's great university. Rhodes earnestly advocated the building of a railroad from Cape Town to Cairo. Already this line has been constructed northward from Cape Town several hundred miles beyond Victoria Falls, directly below which it crosses the Zambezi River. Diamonds of various colors are found in the African mines--brown, yellow, pale blue, clear, and black. The black diamonds, called bort, are used mainly for arming diamond drills and for polishing other diamonds. Green, pink, and mauve diamonds are found occasionally. The De Beers mines have produced some notable stones. From the Premier mine a diamond weighing more than three thousand carats--one and thirty-seven hundredths pounds avoirdupois--was obtained. This stone, more than twice the size of any heretofore found and estimated to be worth five million dollars, was insured for two million five hundred thousand dollars. It was named the Cullinan, from one Tom Cullinan, who purchased the farm on which the Premier mine is located. Captain Wells, the manager of the Premier, one evening, after a burning hot day, when work had been suspended, strolled over to the mine, and, while partly walking and partly sliding down into the pit, noticed a gleam from a stone half-embedded in the earth. In a moment he had the stone in his hand and his practised eye told him this was the greatest diamond the world ever saw. At first the possession of it seemed more like a dream than a reality, and he began to doubt his own sanity. When held up to the blazing Southern Cross, it sparkled like the purest crystal, and he knew that its value must be reckoned in hundreds of thousands of dollars. He immediately took the priceless treasure to the company's office where it was critically examined. It was then sent for safe-keeping to the Standard Bank at Johannesburg, and afterward was forwarded to London. For some time it was deposited in a London bank, the name of which was kept secret for fear that its great value might tempt criminals. Two years after its discovery it was purchased by the Transvaal Government, at the suggestion of General Botha, and presented to King Edward VII as a crown jewel.