It is these principles which both explain Acton's work as a student, and make it so difficult to understand. He believed, that as an investigator of facts the historian must know no passion, save that of a desire to sift evidence; and his notion of this sifting was of the remorseless scientific school of Germany, which sometimes, perhaps, expects more in the way of testimony than human life affords. At any rate, Acton demanded that the historian must never misconceive the case of the adversaries of his views, or leave in shade the faults of his own side. But on the other hand, when he comes to interpret facts or to trace their relation, his views and even his temperament will affect the result. It is only the barest outline that can be quite objective. In Acton's view the historian as investigator is one thing, the historian as judge another. In an early essay on Doellinger he makes a distinction of this kind. The reader must bear it in mind in considering Acton's own writing. Some of the essays here printed, and still more the lectures, are anything but colourless; they show very distinctly the predilections of the writer, and it is hardly conceivable that they should have been written by a defender of absolutism, or even by an old-fashioned Tory. What Acton really demanded was not the academic aloofness of the pedant who stands apart from the strife of principles, but the honesty of purpose which "throws itself into the mind of one's opponents, and accounts for their mistakes," giving their case the best possible colouring. For, to be sure of one's ground, one must meet one's adversaries' strongest arguments, and not be content with merely picking holes in his armour. Otherwise one's own belief may be at the mercy of the next clever opponent. The reader may doubt how far Acton succeeded in his own aim, for there was a touch of intolerance in his hatred of absolutism, and he believed himself to be divided from his ecclesiastical and political foes by no mere intellectual difference but by a moral cleavage. Further, his writing is never half-hearted. His convictions were certitudes based on continual reading and reflection, and admitting in his mind of no qualification. He was eminently a Victorian in his confidence that he was right. He had none of the invertebrate tendency of mind which thinks it is impartial, merely because it is undecided, and regards the judicial attitude as that which refrains from judging. Acton's was not a doubting mind. If he now and then suspended his judgment, it was as an act of deliberate choice, because he had made up his mind that the matter could not be decided, not because he could not decide to make up his mind. Whether he was right or wrong, he always knew what he thought, and his language was as exact an expression of his meaning as he could make it. It was true that his subtle and far-sighted intelligence makes his style now and then like a boomerang, as when he says of Ranke's method "it is a discipline