Is there a logic of history? Is there, beyond all the casual and incalculable elements of the separate elements of the separate events, something that we may call a metaphysical structure of historic humanity, something that is essentially independent of the outward forms – social, spiritual and political – which we see so clearly? Are not these actualities indeed secondary or derived from that something? Does world-history present to the seeing eye certain grand traits, again and again, with sufficient constancy to justify certain conclusions? And if so, what are the limits to which reasoning from such premisses may be pushed?