A curious instance of cipher occurred at the close of the sixteenth century, when the Spaniards were endeavoring to establish relations between the scattered branches of their vast monarchy, which at that period embraced a large portion of Italy, the Low Countries, the Philippines, and enormous districts in the New World. They accordingly invented a cipher, which they varied from time to time, in order to disconcert those who might attempt to pry into the mysteries of their correspondence. The cipher, composed of fifty signs, was of great value to them through all the troubles of the “Ligue,” and the wars then desolating Europe. Some of their dispatches having been intercepted, Henry IV. handed them over to a clever mathematician, Viete, with the request that he would find the clue. He did so, and was able also to follow it as it varied, and France profited for two years by his discovery. The Court of Spain, disconcerted at this, accused Viete before the Roman Court as a sorcerer and in league with the devil. This proceeding only gave rise to laughter and ridicule. * * * * * A still more remarkable instance is that of a German professor, Herman, who boasted, in 1752, that he had discovered a cryptograph absolutely incapable of being deciphered without the clue being given by him; and he defied all the savants and learned societies of Europe to discover the key. However, a French refugee, named Beguelin, managed after eight days’ study to read it. The cipher—though we have the rules upon which it is formed before us—is to us perfectly unintelligible. It is grounded on some changes of numbers and symbols; the numbers vary, being at one time multiplied, at another added, and become so complicated that the letter _e_, which occurs nine times in the paragraph, is represented in eight different ways; _n_ is used eight times, and has seven various signs. Indeed, the same letter is scarcely ever represented by the same figure. But this is not all; the character which appears in the place of _i_ takes that of _n_ shortly after; another Symbol for _n_ stands also for _t_. How any man could have solved the mystery of this cipher is astonishing. All these cryptographs consist in the exchange of numbers of characters for the real letters; but there are other methods quite as intricate, which dispense with them. * * * * * The mysterious cards of the Count de Vergennes are an instance. De Vergennes was Minister of Foreign Affairs under Louis XVI., and he made use of cards of a peculiar nature in his relations with the diplomatic agents of France. These cards were used in letters of recommendation or passports, which were given to strangers about to enter France; they were intended to furnish information without the knowledge of the bearers. This was the system. The card given to a man contained only a few words, such as:—