This book is a significant accomplishment, and for now the most comprehensive intervention in a debate that has been more than three hundred years in the making. At least since Pierre Bayle, commentators have imagined a sort of paradox in the pairing of Spinoza’s irreproachable way of life with his scandalous philosophy, in contrast with the perfect fit between Leibniz’s optimism for the status quo with his supposedly opportunistic relation to his courtly benefactors. Together with these biographical coordinates, to which (...) Lærke’s work is attentive and sensitive, there is a philosophical opposition that is supposed to be absolute: each philosopher is the other’s perfect opposite. Matthew Stewart’s bestseller The Courtier and the Heretic is the latest iteration of this myth, and Lærke’s study might best be summed up as the perfect antidote to Stewart’s: it is a rigorous, dense, and, most importantly, a just treatment of the authors themselves, whose own words often belie the roles in which they would posthumously be cast. While Lærke acknowledges that there is indeed an easy opposition one can construct between the major metaphysical commitments of the two thinkers, he nonetheless wants to know how their systematic differences might have grown out of an intense engagement on Leibniz’s part with a philosophy he indeed ended up opposing, yet against which he felt compelled to articulate his own views, and back to which he often seemed in danger of returning. (shrink)

In very recent Leibniz commentary, there has been a movement among some commentators toward the view that Leibniz was not an unwavering monadological immaterialist, committed to the substantiality only of absolutely simple, immaterial nodes of perception and appetite. It has been conceded that Leibniz was also partially sympathetic to an ontology that would concede full substantiality to composite entities. Most commentators who have been willing to concede as much have confined this alternative metaphysics to Leibniz's middle period, roughly 1676--1694. These (...) commentators, moreover, have remained fairly silent as to the reasons why Leibniz might wish to consider an ontology at such odds with his well-known immaterialism. In this dissertation, I contribute to the discussion of Leibniz's composite-substance metaphysics in three ways. First of all, I am going to argue that we should see the composite-substance metaphysics as an alternative Leibniz sustained until the very end of his career. Second of all, I provide an account of Leibniz's motivation for sustaining this alternative metaphysics, arguing that the composite-substance metaphysics is first and foremost the result of Leibniz's effort to provide a philosophical interpretation of the recent discovery of the apparent ubiquity of microscopic life. Finally, I vindicate a number of 18th-century, microorganic and physicalistic interpretations of Leibniz's theory of monads, particularly those of the Francophone natural scientists, against the view among 20th-century commentators that Leibniz was grossly misinterpreted in the decades following his death in 1716. I show that 18th-century, thinkers didn't so much misinterpret Leibniz, as they did emphasize one, currently very unfamiliar, tendency in Leibniz's thought on the nature of substance. (shrink)

If anyone ever lived up to our image of a baroque Universalgelehrter, it may have been the Jesuit natural philosopher Athanasius Kircher, whose life and interests spanned most of the 17th century. In his prolific career, Kircher wrote at least 14 major works, on subjects as varied as light, magnetism, music, geology, combinatorics, and Sinology. Thomas Leinkauf’s thorough, penetrating study of Kircher’s life and work does a tremendous job of making the Jesuit’s work both comprehensible and fascinating, as well as (...) granting us a vision of the inner workings of Kircher’s mind, a mind formed both by his period and his position in the history of ideas, and driven by an unusual creativity and capacity for synthesis. (shrink)

If anyone ever lived up to our image of a baroque Universalgelehrter, it may have been the Jesuit natural philosopher Athanasius Kircher, whose life and interests spanned most of the 17th century. In his prolific career, Kircher wrote at least 14 major works, on subjects as varied as light, magnetism, music, geology, combinatorics, and Sinology. Thomas Leinkauf’s thorough, penetrating study of Kircher’s life and work does a tremendous job of making the Jesuit’s work both comprehensible and fascinating, as well as (...) granting us a vision of the inner workings of Kircher’s mind, a mind formed both by his period and his position in the history of ideas, and driven by an unusual creativity and capacity for synthesis. (shrink)