It is, however, my hope that in many cases, including the most important cases, theses can be established by direct evidence in their favour, not just by elimination of their rivals. I shall refer to this issue again later when I come to say something about the character of metaphysical argument and its connection with so-called transcendental argument. The kind of metaphysical argument which I have in mind might be said, perhaps, to exemplify a 'diagogic' as opposed to 'epago-gic' or inductive approach to philosophical argumentation. Now, the more emphasis is placed on justification by elimination of rivals, the greater is the impetus given to refutation, whether of theses or of people; and perhaps a greater emphasis on 'diagogic" procedure, if it

could be shown to be justifiable, would have an eirenic effect. 63