During the mid-18th century, when electricity was coming into its own, natural philosophers began to entertain the possibility that electricity is the mysterious nerve force. Their attention was first drawn to several species of strongly electric fish, namely torpedoes, a type of African catfish, and a South American "eels." This was because their effects felt like those of discharging Leyden jars and could be transmitted along known conductors of electricity. Moreover, their actions could not be adequately explained by popular mechanical (...) theories. Many of the early documents supportive of the hypothesis of animal electricity were associated with the Dutch colonies in South America. This article presents and examines those documents, and shows how Dutch scientists on both sides of the Atlantic conducted experiments and communicated with each other in the 1750s and 1760s. It reveals the important roles played by inquisitive physicians and lovers of nature in South America, and by natural philosophers and collectors of exotic specimens in the Netherlands—learned men who began to make a credible case for animal electricity in some exciting places at a pivotal moment in time. (shrink)

For 7 December 1683, the transactions of the Oxford Philosophical Society record the following experiment: “It was deliver’d by Mr. Harris, as found true by a late triall, that Juice of Onions did...

Sixteenth century pharmacology was still very much under the influence of a distinction going back to ancient medicine: the distinction between effects of medicaments that were taken to be explainable by the elementary qualities, their mutual modification in mixture, and the combination of these modified elementary qualities on the one hand, and the effects of medicaments that were taken not to be explicable in this manner.1 Galen coined the expression that a medicament of the latter kind possesses the capacity of (...) acting "by its whole substance,"2 and the question of how actions of the whole substance could be explicated gave rise to heated controversies in early modern pharmacology. Did Galen just... (shrink)

During the mid-18th century, when electricity was coming into its own, natural philosophers began to entertain the possibility that electricity is the mysterious nerve force. Their attention was first drawn to several species of strongly electric fish, namely torpedoes, a type of African catfish, and a South American "eels." This was because their effects felt like those of discharging Leyden jars and could be transmitted along known conductors of electricity. Moreover, their actions could not be adequately explained by popular mechanical (...) theories. Many of the early documents supportive of the hypothesis of animal electricity were associated with the Dutch colonies in South America. This article presents and examines those documents, and shows how Dutch scientists on both sides of the Atlantic conducted experiments and communicated with each other in the 1750s and 1760s. It reveals the important roles played by inquisitive physicians and lovers of nature in South America, and by natural philosophers and collectors of exotic specimens in the Netherlands—learned men who began to make a credible case for animal electricity in some exciting places at a pivotal moment in time. (shrink)

I argue that the imagination was a crucial concept for the understanding of marvellous phenomena, divination and magic in general. Exploring a debate on prophecy at the turn of the seventeenth century, I show that four explanatory categories were consistently evoked and I elucidate the role of the imagination in each of them. I introduce the term ‘floating concept’ to conceptualise the different ways in which the imagination and the related ‘animal spirits’ were understood in diverse discourses. My argument is (...) underpinned with a general discussion of the imagination, after which I focus on a unorthodox tradition which attributed special powers to this internal faculty. Many physicians had explained psychosomatic phenomena by referring to the influence of the imagination on the human body; but some philosophers held that the imagination could also exert power over external objects. During the renaissance these theories acquired negative associations and became linked with illicit magic. Furthermore, I show that the relation between both animal spirits and imagination, and the power of the latter over external bodies, points to the importance of a ‘history of vapours’; and this suggests an adjustment to Keith Hutchison’s argument on occult qualities in mechanical philosophy. The accompanying paper gives more evidence of these claims and elaborates on the relation between the natural and the moral. (shrink)

This paper aims to assess the epistemological value of the notion of sympathy in Galen’s thought. It first shows that Galen makes use of two different concepts of sympathy: the ambient concept, according to which the human body manifests a harmonious part-whole relationship, and the technical concept, with which one connects two pathologies on the basis of the fact that the cause of the ailment is elsewhere than where it surfaces. Neither of these sympathies constitutes in itself a causal explanation (...) of reality. The first merely acknowledges an obvious interrelationship, the second acts as an epistemic tool to shift the focus of diagnosis away from the place where the condition manifests itself. However, the two concepts are not absolutely unrelated; and they come together when the sympathetic paradigm is used to understand the unifying action of the psychic and natural faculties. Very significantly, Galen then provisionally defines the cause as a power or faculty (δύναμις) not out of theoretical necessity but for practical reasons. (shrink)

Pierre Viret (1511–1571), one of the leaders of the Calvinist Reformation, claims that the natural theology of his Instruction Chrestienne (1564) dedicated to the Faculty of Medicine of Montpellier, is a spiritual medicine. This paper shows that such spiritual medicine amounts to a specific expression of Calvinist pastoralism. Viret's natural theology uses natural-historical data as moral examples, thus transforming them into the material fit for his pastoral cure. This cure consists in exhorting his audience to bear the trials of divine (...) Providence by meditating on their own sinful state: such medicine asserts the limits of human reason. (shrink)