This article reviews a ponderous, “unique,” and “amusing” book on Quakerism by Dr. Samuel Hanson Cox. The author considers Quakerism heretical. The reviewer says the book is “highly instructive,” able to clarify complexities of Quakerism through a combination of Scripture and logic. The book is severe and sarcastic, sometimes inappropriately, but it honestly strives to do good. Following initial comments, the reviewer recaps the origin of Quakerism in the early 17th century as well as its persecution. The reviewer describes three prominent Quakers: Fox, Barclay, and Penn. Following a description of the Quaker sects is a description of the “inward light” doctrine and a number of Quaker views. The Friends (Quakers) are “distinguished by exemplary morality,” but their system is “at best an adulterated kind of Christianity.” The religion is unfriendly to intellectualism and promotes enthusiasm. The reviewer believes Quakerism supports self-righteousness and does not preach true moral principles.