This introductory paper raises, partly as a preparation for the other papers in this issue, questions about how philosophy ought to proceed in the light of knowledge we have in surrounding disciplines, with a focus on the case of addiction. It also raises issues about how addiction research might be enlightened by philosophical work. In the background for the paper are two competing approaches to the evidential grounding of philosophical insight. According to a widespread view, philosophical knowledge rests on a set of intuitions. According to another, philosophy has no special evidential grounding. This paper resists the attractions of the first picture, and argues against the separateness of philosophy that it lends support. I try to make plausible that such a picture is harmful both for philosophy and for empirical science. We should replace it with a mild form of unity of science or unity of inquiry, in the spirit of the founder of this journal.
This is an Accepted Manuscript of an article published by Taylor & Francis in Inquiry on 25 Jun 2013, available online: http://www.tandfonline.com/10.1080/0020174X.2013.806121