The article reviews a set of books on the subject of mental science. Its author, George Payne, condenses the positions of other philosophers to construct his opinion. Payne believes that the mind is immaterial. The reviewer describes Payne’s position on “the nature of the powers of the mind” while commenting on his terminology. He also addresses Payne’s thoughts on consciousness, identity, the “analysis and arrangement of the mental phenomena,” Payne’s classifications and the sensations of each organ. The reviewer takes issue with certain positions Payne takes. He debates what is and is not a “faculty.” More discussion addresses volition and other aspects of mind, ending with ethics. The reviewer recommends the work for its helpful descriptions of writers of mental philosophy.