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90 paper was taken away by Lord Broucnker, who kept it in his possession, saying, that "it was too great an arcanum of State to be commonly perused." He also wrote a treatise on Naval Philosophy, in three parts, and at the end, as an appendix, "An account of several new Inventions, in a discourse by way of letter to the Earl of Marlborough," published in 1691; and he drew up the 198th Number of the Philosophical Transactions, entitled "What a complete Treatise of Navigation should contain." He died in his sixty-fifth year, December 16, 1687, one of the most accomplished and learned men of his time. A plain flat stone marks his grave at Rumsey, bearing this inscription: