Socinianism unmasked [electronic resource] : in four letters to the lay-members of the Church of Scotland, and especially to those of the collegiate church of Ayr: occasioned by Dr. Mcgill's Practical essay on the death of Jesus Christ. Proving, That he denies the great Doctrines of the Atonement, of the Deity of our Lord, &c. &c. To which are added, a letter to the doctor. And an humble address to the Members of the General Assembly of the Church of Scotland. By a friend to truth. With Reflections on the Influence of the Socinian Doctrine on Holiness of Life.