This paper deals with Hobbes's theory of optical images, developed in his optical magnum opus, ‘A Minute or First Draught of the Optiques’, and published in abridged version in De homine. The paper suggests that Hobbes's theory of vision and images serves him to ground his philosophy of man on his philosophy of body. Furthermore, since this part of Hobbes's work on optics is the most thoroughly geometrical, it reveals a good deal about the role of mathematics in Hobbes's philosophy. (...) The paper points to some difficulties in the thesis of Shapin and Schaffer, who presented geometry as a ‘paradigm’ for Hobbes's natural philosophy. It will be argued here that Hobbes's application of geometry to optics was dictated by his metaphysical and epistemological principles, not by a blind belief in the power of geometry. Geometry supported causal explanation, and assisted reason in making sense of appearances by helping the philosopher understand the relationships between the world outside us and the images it produces in us. Finally the paper broadly suggests how Hobbes's theory of images may have triggered, by negative example, the flourishing of geometrical optics in Restoration England. (shrink)

O ponto de partida da Philosophia prima de Hobbes tem como referência a Física e a Metafísica de Aristóteles. O desenvolvimento posterior de sua Philosophia prima, porém, põe em marcha uma crítica da metafísica aristotélica que conduzirá a um remanejamento teórico de uma série de princípios e conceitos herdados da tradição. Considerada em seu conjunto, a filosofia primeira hobbesiana é constituída por uma definição ampla, isto é, a metafísica definida como ciência do ente enquanto ente , sobre a qual duas (...) definições strictu sensu são erigidas: a metafísica como física geral — dizer o ente é dizer o corpo — e a metafísica como representação. Este paper é um esforço no sentido de compreender essas e outras questões concernentes aos estudos hobbesianos sobre a forma como conhecemos o mundo, as coisas e nós mesmos. (shrink)

Thomas Hobbes's doctrine of space is here considered as an example of the Nachzuirkung of Jesuit commentaries on Aristotle's natural philosophy in seventeenth-century mechanistic science. Hobbes's doctrine of space can be reconstructed in terms of his intensive dialogue with late scholasticism, as represented in the works of several important Jesuit authors. Although he presents his concept of space as an alternative to the Aristotelian notion of place, there are some remarkable similarities between Hobbes's alternative notion of space and the concept (...) of spatium imaginarium, found in the Jesuit commentaries. While Hobbes adopts many scholastic elements, he employs these to his own purposes. Thus, on the one hand, this article does not so much challenge Hobbes's "modernity", but rather tries to put it in its proper perspective. On the other hand, it tries to show the vitality and importance of Jesuit natural philosophy in non- or even anti-Aristotelian contexts. (shrink)

Kepler is mainly known among historians of science for his astronomical theories and his approaches to problems having to do with philosophy of science and ontology. This paper attempts to contribute to Kepler studies by providing a discussion of a topic not frequently considered, namely Kepler’s theory of the soul, a general theory of knowledge whose central problem is what makes knowledge possible, rather than what makes knowledge true, as happens in the case of Descartes’s and Bacon’s epistemologies. Kepler’s theory (...) consists of four issues: the theory of the different sorts of soul—that is, the human soul, the animal soul, the vegetable soul, and the Earth soul—concerning their faculties, the differences and the resemblances emerging among them, the relation they maintain with their own bodies and the world, and the distinction soul–world. The paper discusses these issues from a historical perspective, that is, it reconstructs the way they appear in three periods of Kepler’s career: the period prior to the publication of the Mysterium cosmographicum, the period from 1596 to 1611, and the period of the Harmonices mundi libri V. Finally, Kepler’s epistemology is briefly contrasted with Descartes’s and Bacon’s in order to suggest that Kepler’s could be seen as a third way to understand the philosophical origins of Modernity.Keywords: Johannes Kepler; René Descartes; Francis Bacon; Anima; Force; Animism. (shrink)