A generation ago scientific ideas floated free in the air, as historians gazed up at them in wonder and admiration. From time to time, historians agreed, the ideas that made up the body of scientific truth became incarnate: they were embedded into the fleshly forms of human culture and attached to particular times and places. How this incarnation occurred was a great mystery. How could spirit be made flesh? How did the transcendent and the timeless enter the forms of the (...) mundane and the contingent? Platonist and providentialist perspectives offered ways of speaking about the mystery, but, in general, it remained unresolved at the core of orthodox idealist historiography.1. (shrink)