I have purposely limited myself to a rather brief statement in this introduc- tion, in order that the summing up be not misrepresented for the discursive development of the whole. There is something more than mildly dangerous in setting oneself a series of goals in an introduction only to find them happily attained in the conclusion, as if getting from the beginning to the end was simply a question of transition. Of course, the destination of a speculative...