One of the most important components of early modern science was the experiment. Advocates of the “new sciences” used experiments as indisputable evidence in controversies with their opponents and as powerful arguments against authoritative texts. Among the first early modern scientific works to systematically and successfully use experiments as parts of the central argumentation is William Gilbert’s treatise De magnete (1600), in which the author sought to present a completely new theory of magnetism as an explanation of phenomena on earth (...) as well as of the movements of heavenly bodies. Gilbert goes to great lengths to persuade his readers of the innovation of his nova et inaudita physiologia. For this, however, it did not suffice to present a startling number of experiments and advocate empirical investigation. This contribution will shed light on the surprising literary and rhetorical tools employed in the De magnete in questions of authority, which aided Gilbert in presenting his powerful and highly successful “New Physiology.”. (shrink)

Francis Bacon’s natural philosophy contains a whole series of interconnected concepts related to extension, such as “borders,” “leaps” and “orbs of virtue”. These Baconian concepts are still not fully understood and are in need of a detailed analysis. They do not derive from a general conception of physical or mathematical space, and are not explainable in terms of parts of matter and aggregates. Instead, they are somewhat mysteriously defined in terms of limits and boundaries of action. This article offers a (...) contextual investigation of Bacon’s extension relating concepts. I show that in adopting a particular strategy of deriving spatial properties and extension related concepts from a theory of action and force, Bacon follows in the footsteps of Gilbert’s magnetic philosophy. However, in contrast to the more traditional approaches of William Gilbert, Giovan Battista della Porta and Johannes Kepler, Bacon strips his extension-related concepts from most natural philosophical content and argues for a methodologically driven approach, leading to operational definitions. (shrink)