"Her book cannot fail to leave an enduring mark on our understanding of the Scientific Revolution....a major contribution to the growing but still small literature on Gassendi; she absolutely rejects the interpretation of Gassendi as covert materialist. The book includes as well excellent brief expositions of two different mechanical philosophies, which will in themselves be of interest to historians of seventeenth century science....It will be evident from the review above that I find Osler's argument convincing. Her book brings an unexpected perspective to bear on the Scientific Revolution, such that every student of seventeenth century science will need to consider it. Even those who may disagree with Osler's thesis will find, I believe, that they cannot ignore it." Richard Westfall, The Philosophical Review