A letter to the most noble Thomas, Duke of Newcastle, On certain Points of the last Importance to these Nations: being an enquiry, I. Into the genuine Sources of Disaffection in both Parts of Great-Britain, separately considered, from the Abdication of King James II. to the present Time. And II. Into the most rational Measures for effectually extinguishing the Remains of the present detestable Rebellion; and for re-establishing, and farther augmenting the Prosperity, Reputation, and Grandeur of the British Empire.