"The only short and acceptable summary and analysis of the five Renaissance occult sciences." - Times Literary Supplement
"The . . . usefulness of this book for students of Renaissance literature and culture will not soon be ended." - Virginia Quarterly Review
"The absence of contaminating traces either of condescension or of credulousness give this absorbing volume a special authority and place on the shelves of any reader or any library where the history of modern thoughts is relevant." - Scientific American
"A remarkable summary and analysis of the five systems of esoteric science so influential in the Renaissance." - Milton Quarterly
"A magnificent job of tying together a vast number of diverse sources into a unified whole . . . engrossing in its entirety." -The Sciences
