A summary account of the deists religion: In a Letter to that Excellent Physician. The late Dr. Thomas Sydenham. To which are annex'd, Some Curious Remarks on the Immortality of the soul; and An essay by the Celebrated Poet, John Dryden, Esq; to prove that Natural Religion is alone necessary to Salvation, in Opposition to all Divine Revelation. N. B. This last Piece contains the strongest Arguments against the Necessity and Advantages of a Divine Revelation, ever yet published.