"Bussotti has made a determined effort to convey its technical content in both the published and unpublished sources. His book will be a standard source for understanding ethereal physics and the reception of Newton's dynamics at the end of the seventeenth century. The fascination of the material is evident in the detailed exposition provided by the author. The book also breaks welcome new ground in documenting the influence of Kepler on Leibniz." (Craig G. Fraser, Mathematical Reviews, May, 2016)