ABSTRACT
Russell said that logic is the essence of philosophy, and early attempts to utilise the approach his words epitomise often took the form of a search for analytic definitions or logical equivalences, or at least for implication relations. Whether or not the analytic programme conceived in these terms has been shown to be unfulfillable or unilluminating in the most central philosophical areas, Russell's works display a remarkable lack ofany satisfactory account of certain notions that appear to underlie such a programme. Russell's treatments of such notions as logical necessity tended to be meagre or patently unacceptable. In this part, I give an example of definitional inquiry with positive results I take to be philosophically illuminating. Among the consequences of this inqu~ry is an epistemological account of logical necessity that sheds light, inter alia, on the nature of philosophical analysis. .
