In examining what seem to me to have been significant fields (or significant concentrations) of study in recent times, I wish to show how these have reacted on our conception of general history and how our very notion of the historian's universe has been undergoing a subtle transformation. In attempting to discuss some of the points where pressure has been exerted on historical study by war and international crisis, I wish to show how the very nature of history and the results of historical analysis prescrjbe to the historian his role when the momentous-ness of the contemporary world confronts him with claims and challenges. It will be useful to hold the figure of Lord Acton in the background, in order to measure the modern version of the human drama, and the modern view of the historian's function in the world, against the one which he so explicitly formulated.