A letter to the Reverend Dr. Benjamin Prat, chaplain in Ordinary to His Grace the Duke of Ormond, J.V. Professor, and fellow of Trinity College in Dublin : Wherein, the dangerous errors in a late book, intituled, An essay concerning the use of reason in propositions, the evidence whereof depends upon human testimony: are detected, confuted, and gradually deduc'd from the very basis of all atheism, upon which alone they are bottom'd. By William Caroll.