Alchemical writings of Arabic origin introduced into the Latin natural philosophy of the twelfth century a cosmological issue that was at variance with Aristotelian cosmology: the idea of a subtle substance that stood at the origin of the four elements and encompassed heaven and earth. In this article, I consider the links of this notion with Hermetic and Stoic thought; its association with the technical process of distillation; its emergence in some philosophical texts of the early thirteenth century; and finally (...) its full development in two fourteenth century alchemical treatises, the Testamentum attributed to Raimond Lull and the Liber de consideratione quintae essentiae written by John of Rupescissa. (shrink)

It has not been sufficiently emphasized that there existed two kinds of modification theory of colours, Aristotle's modification theory and Descartes-Hook's modification theory. This seems to have caused some confusion in the interpretation of the optical controversy between Newton and Hooke in 1672. The aim of the present paper is to prove that these two kinds of modification theory really coexisted, and on that basis to present a new interpretation of the optical controversy of 1672. The characteristics and the historical (...) role of each of these theories will be described. Newton's colour theory was formed under the influence of Aristotle's modification theory, which had been disseminated through the work of an English Gassendist, Walter Charleton. Newton's optical theories were created not only under the influence of Descartes, as we have been often told, but also under the conspicuous influence of corpuscular philosophers. (shrink)

The Hermetica are a body of mystical texts written in late antiquity, but believed during the Renaissance (when they became well known) to be much older. Their supposed author, a mythical figure named Hermes Trismegistus, was thought to be a contemporary of Moses. The Hermetic philosophy was regarded as an ancient theology, parallel to the revealed wisdom of the Bible, supporting Biblical revelation and culminating in the Platonic philosophical tradition. This new translation is the only English version based on reliable (...) texts, and Professor Copenhaver's introduction and notes make this accessible and up-to-date edition an indispensable resource to scholars. (shrink)