Its author is as mysterious as its subject matter. The one appearance of English occultist FRANCIS BARRETT (b. circa 1770) upon the literary scene is this mammoth 1801 work, a complete study of ritual magic, in practice and in its theoretical underpinnings. Drawing on numerous works of the arcane and the occult, this one-of-a-kind book ignited a fervor for magic, in all its forms, in the Europe in the early 19th century, and may have even influenced Joseph Smith, founder of the Mormon Church. Subtitling his tome Celestial Intelligencer, Barrett promises here to present a "complete system of...