"Why," was the reply, "I mean that they are rather '_on_ color.' The best diamonds are pure white, but nearly all of those from Africa have a yellowish tint, which greatly reduces their value. The stones from Brazil and India are of 'first water,' or colorless, and consequently their value has not materially suffered; but the case is different with yellow stones, which have lost three-fourths of their value since the African fields were opened. It is said there was quite a panic among the diamond owners when they saw what immense numbers of the stones came from Africa, and some of them predicted that diamonds would become as common as garnets or amethysts in a very few years. But of late the mines are said to have been exhausted, and the industry has greatly declined. "Another discovery of South Africa is the ostrich." "Nonsense!" exclaimed Fred. "The ostrich was known long before the English went to that country, and long before an Englishman ever existed. I believe it is mentioned in the Bible." "You didn't hear me through," said Frank. "I was going to say that the discovery of the possibility of domesticating ostriches and raising them, as we raise sheep or cattle, was made in South Africa." "How was that?" "Down to about twenty years ago ostriches were only known in a wild state, with the exception of a few that were held in menageries or otherwise kept as curiosities. Ostrich farming had been tried in Algeria, but with only partial success, and not to any great extent. The ostrich feathers which are so much prized, and sell for high figures, were obtained by hunting the wild birds in their desert homes. "Two hundred years ago these birds were so abundant in South Africa that they were often seen within a few miles of Cape Town, and a hunter could be reasonably certain of all the sport he wanted by going a few miles into the country. The colonization of the region has caused their disappearance, and anybody who wants them in a wild state must go to the deserts north of the Orange River, or to other unsettled portions of the continent. "The chase of the wild ostrich is now almost entirely in the hands of the aboriginals. The feathers obtained in this way are bought by traders, who go into the wilderness carrying such goods as the natives will accept. These they barter for the precious feathers, and when they have finished their traffic they return to the settlements with their valuable commodity." "Ostrich feathers command a high price," said Fred, "and I suppose the dealers find their trade very profitable."