"Do not go till I come." Example of reduction F L Y aabab ababa babba DO_N_O_T_ G_O_T_I_L _L_I_CO_M--_E_ do not go till I come * * * * * From the above given dates it would almost seem as if Bacon had treated the matter in a purely academic manner, and had drawn out of his remembrance of his younger days a method of secret communication which had not seen any practical service. Spedding mentions in his book "Francis Bacon and his Times" that Bacon may have got the hint of the 'bi-literal cypher' from the work of John Baptist Porta, "De occultis literarum notis," reprinted 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 we find him again writing to his uncle the Lord Keeper: "I ever have a mind to serve Her Majesty," and again, "the meanness of my estate doth somewhat move me." In the interval, on 25th August, 1585, he wrote to the Right Hon. Sir Francis Walsingham, Principal Secretary to the Queen: