believing that they had reached eastern Asia, and thus a geographical mistake led to the greatest discovery that has ever been made. In proof of these assertions we may state that Columbus designed delivering at Cuba, the missives of the Spanish king to the great Kahn of the Mongols, and that he imagined himself in Mangi the capital of the southern region of Cathay or China! "The Island of Hispaniola," (Hayti) he declares to Pope Alexander VI., in a letter found in the archives of the Duke of Varaguas,—"is Tarshish, Ophir, and Zipangou. In my second voyage, I have discovered fourteen hundred islands, and a shore of three hundred and thirty-three miles, belonging to the continent of Asia." This West Indian Zipangou produced golden fragments or spangles, weighing eight, ten and even twenty pounds.3
Before the discovery of the silver mines of Tasco, on the western slope of the Mexican Cordillera, in the year 1522, America supplied only gold to the Old World, and consequently, Isabella of Castile was obliged, already in 1497, to modify greatly, the relative value of the two precious metals used for currency. This was doubtless the origin of the Medina edict—which changes the old legal ratio