John Preston

This chapter poses a challenge to the extended mind thesis that Andy Clark and David Chalmers propose for beliefs, upon which their thesis is largely based. Clark and Chalmers present two related theses in their exposition of the extended mind. First they present “active externalism,” which states that a cognitive system is achieved when humans are appropriately linked with external entities; second, they present “the extended mind thesis,” which states that some, if not all, of a subject’s mental phenomena are constituted partly by features of that subject’s environment. The second view is the focus of this chapter, as it is the reasoning behind the notion that beliefs can be constituted partly by features of the environment, and that the mind therefore extends into the world. Arguments in this chapter are confined to beliefs and do not include other mental phenomena.

Steve Fuller seeks to blame Kuhn for the present state of the philosophy of science. It has become ‘Kuhniferous’, he argues, both in structure and in content. I begin by taking issue with this judgement, suggesting that Kuhn wasn’t as influential as his realist and naturalist opponents. I then proceed to argue that Fuller fails to clinch one of his central charges, that Kuhn disconnected the philosophical defence of scientific progress from any substantive ends of science. Kuhn has a story to tell here that should commend itself to Fuller’s ‘instrumentalist’ instincts. That Fuller doesn’t seem to recognise it, I suggest, is down to a certain sort of blindness to epistemological issues, a failure to appreciate that claims to epistemic progress on the part of science may be more than self-serving.

The place of Heinrich Hertz’s The principles of mechanics in the history of the philosophy of science is disputed. Here I critically assess positivist interpretations, concluding that they are inadequate.There is a group of commentators who seek to align Hertz with positivism, or with specific positivists such as Ernst Mach, who were enormously influential at the time. Max Jammer is prominent among this group, the most recent member of which is Joseph Kockelmans. I begin by discussing what Hertz and Mach had to say about one another, and I specify certain respects in which their views are indeed similar. I then go on to detail their differences, looking at Hertz’s attitude to the atomic theory, to the mechanical world-view, to simplicity, to unobservables and metaphysics, and his objections to Newtonian forces. I conclude that the positivist interpretation of Hertz’s mechanics significantly overplays its similarities to Mach’s views.Keywords: Ernst Mach; Heinrich Hertz; Mechanics; Positivism; Atomism; Force; Metaphysics.