At the ceremony of the marriage of the Duchess Juta of Austria to Count Louis of Oettingen, at Vienna in 1319, Pietro Buonaparte, the Podesta of Padua, created considerable excitement by wearing a pair of spectacles which he had received a short time previously from Salvino degli Armati of Florence, the reputed inventor of these contrivances. It is not generally known that the printing of books in very large and bold type during the latter part of the fifteenth and the early part of the sixteenth centuries was done expressly for the benefit of far-sighted readers--this defect in vision characterizing a very large percentage of the learned men of that period. The great number of books which, during those early days of the art of printing, were published in this style, emphasizes the fact that the usefulness of spectacles was not generally appreciated until after the lapse of many scores of years. Being very expensive they were within the reach of only persons of wealth, and, in addition, they were extremely difficult to obtain. As late as during the year 1572, Augustus, Elector of Saxony, moved by a strong wish to possess a pair of spectacles, despatched a special messenger first to Leipzig and then to Augsburg with instructions to purchase them for him at the great annual fair. This agent, however, was unsuccessful in the attempt, and, accordingly, in the summer of 1574, he was instructed to ride on as far as Venice. But, on arriving there, he was informed that no glasses would be ground before the month of October. He was consequently obliged to remain in that city until the autumn, at which time he sent word to his master that the optician’s charge for the instrument would be 50 thalers (equivalent to $250 at the present value of money). The Elector, it appears, was only too glad to pay this sum for the coveted article. The first spectacles made were equipped with only convex glasses, for the use of far-sighted persons. It was not until about two hundred years later that the art of grinding concave glasses for the relief of short-sighted individuals was discovered.