An Enquiry Into the Patriarchal and Druidical Religion, Temples, &c: Being the Substance of Some Letters to Sir Hildebrand Jacob, Bart. Where-in, the Primaeval Institution and Universality of the Christian Scheme is Manifested; the Principles of the Patriarchs and Druids are ... Shewn to Correspond Entirely with Each Other, and Both with the Doctrines of Christianity; the Earliest Antiquities of the British Islands are Explained; and an Account Given of the Sacred Structures of the Druids