Three tracts. By Joseph Priestley, LL.D. F.R.S. I. An appeal to the serious and candid professors of Christianity, on the following subjects, viz. 1. The use of reason in matters of religion, 2. The power of man to do the will of god, 3. Original sin, 4. Election and reprobation, 5. The divinity of christ; and, 6. Atonement for sin by the death of christ. To which are added, A concise history of those Doctrines, and the Triumth of Truth, being an Account of the Trial of Mr. E. Elwall, for Heresy and Blasphemy. II. A familiar illustration of certain passages of scripture. III. A general view of the arguments for the unity of God.