John Wright

The author argues that the core of Hume’s Academic skepticism lies in his commitment to an external world and objective causal powers that are cognitively opaque to human understanding. Three central topics of Hume’s theory of the understanding are discussed—the existence of absolute space, the existence of a world external to our senses, and the existence of objective causal powers. In each case, Hume draws a Pyrrhonian opposition between judgments based on his “Copy Principle” and the “fictions” or “illusions” formed through association of ideas. While he suspends judgment concerning the existence of absolute space, he argues that the association-based beliefs in an external world and objective causal powers are necessary for human life and indispensible in science. In adopting such beliefs about external reality, while at the same time denying their intelligibility, Hume was following ancient Academic skepticism.

Sandy, as he was known to so many Hume scholars, died peacefully in Salisbury, England on July 30, 2021. For many years, Sandy welcomed Hume scholars to Edinburgh where he was often found working in the Rare Books and Manuscripts Departments of the National Library of Scotland and the University of Edinburgh. He shared his vast knowledge of all things Humean in conversation with visitors from all parts of the world, as well as in his many publications. He was especially generous with his time and expertise to younger Hume scholars at the start of their careers.In various collections including Studies in The Philosophy of the Scottish Enlightenment and in the co-edited Hume and Hume's Connexions Sandy...

In this paper I show how what came to be known as “the double law of habit,” first formulated by Joseph Butler in a discussion of moral psychology in 1736, was taken up and developed by medical physiologists William Porterfield, Robert Whytt, and William Cullen as they disputed fundamental questions regarding the influence of the mind on the body, the possibility of unconscious mental processes, and the nature and extent of voluntary action. The paper shows, on a particular topic, the overlap between eighteenth-century philosophical writings on the science of human nature on the one hand,and medical writings and lectures in physiology on the other. Other early modern writers discussed in the paper include René Descartes, Herman Boerhaave and David Hume.