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460 printed in Strasburg in 1606, but the first edition of which was published when Porta was a young man. It is however manifest from certain evidence, that Bacon practised his special cipher and used it for many years. Lady Bacon, mother of the philosopher, writing in 1593, to her son Anthony, elder brother of Francis, speaking of him, Francis, says, "I do not understand his enigmatical folded writing." Indeed it is possible that many years before he had tried to have his invention made use of for public service. His was an age of secret writing. Every Ambassador had to send his despatches in cipher, for thus—and even then not always—could they be safe from hostile eyes. The thousands of pages of reports to King Philip made by Don Bernardino de Mendoza, the Spanish Ambassador at the Court of Queen Elizabeth, before the time of the Armada, were all written in this form; the groaning shelves of the records at Simancas bear evidence of the industry of such political officials and of their spies and secretaries. An ambitious youth like Francis Bacon, son of the Lord Keeper, and so traditionally and familiarly in touch with Court and Council, who in his baby days was addressed by Elizabeth as her "young Lord Keeper," and who spent the time between his sixteenth and eighteenth years in the suite of the English Ambassador in Paris, Sir Amyas Paulet, must have had constant experience of the need of a cipher which would fulfill the conditions which he laid down as essential in 1605—facility of execution, impossibility of discovery, and lack of suspiciousness. When, in a letter of 16 Sept. 1580, to his uncle Lord Burghley, he made suit to the Queen for some special employment, it is possible that the post he sought was that of secret writer to Her Majesty. His letter, though followed up with a more pressing one on 18th October of the same year, remained unanswered. Whatever the motive or purpose of these last two letters may have been, it remained on his mind; for eleven years later