"Emeralds down that way!" repeated Peter Fenton. "Why, the best emeralds in the world are found in South America. The very best are found in veins traversing clay-slate, hornblende slate, and granite, in a little valley not far from Bogota, the capital of the United States of Colombia. Inferior stones are found imbedded in mica slate in Europe. You see I've been reading up on South America."