Several letters to the Revd. Mr. Jackson : from William Dudgeon a gentleman in Berwickshire. With Mr. Jackson's answers to them. Concerning The Immensity and Unity of God; The Existence of material and spiritual Substance; God's moral Government of the World; The Nature of Necessity and Fate, and of Liberty of Action: and the Foundation, Distinction, and Consequences of Virtue and Vice, Good and Evil. Written in the years 1735 and 1736; and occasioned by two books written by Mr. Jackson, one entituled The existence and unity of God proved from his nature and attributes. The other being the defence of it