Abstract

My topic is the materialist appropriation of empiricism—as conveyed in the ‘minimal credo’ nihil est in intellectu quod non fuerit in sensu. That is, canonical empiricists like Locke go out of their way to state that their project to investigate and articulate the ‘logic of ideas’ is not a scientific project: “I shall not at present meddle with the Physical consideration of the Mind”. Indeed, I have suggested elsewhere, contrary to a prevalent reading of Locke, that the Essay is not the extension to the study of the mind of the methods of natural philosophy; that he is actually not the “underlabourer” of Newton and Boyle he claims politely to be in the Epistle to the Reader. Rather, Locke says quite directly if we pay heed to such passages, “Our Business here is not to know all things, but those which concern our Conduct”. There would be more to say here about what this implies for our understanding of empiricism, but instead I shall focus on a different aspect of this episode: how a non-naturalistic claim which falls under what we now call epistemology becomes an ontology—materialism. That is, how an empiricist claim could shift from being about the sources of knowledge to being about the nature of reality.. Put differently, I want to examine the shift from the logic of ideas in the seventeenth century to an eighteenth-century focus on what kind of ‘world’ the senses give us, to an assertion that there is only one substance in the universe, and that we need an account of the material substrate of mental life. This is neither a ‘scientific empiricism’ nor a linear developmental process from philosophical empiricism to natural science, but something else again: the unpredictable emergence of an ontology on empiricist grounds.