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Rh guidance, except where the aggregates are large enough to cancel out individual peculiarity and exhibit large uniformities. Reason in politics is especially immature in predicting the behavior of individual men, because in human conduct the smallest initial variation often works out into the most elaborate differences. That, perhaps, is why when we try to insist solely upon an appeal to reason in dealing with sudden situations, we are broken and drowned in laughter.

For the rate at which reason, as we possess it, can advance itself is slower than the rate at which action has to be taken. In the present state of political science there is, therefore, a tendency for one situation to change into another, before the first is clearly understood, and so to make much political criticism hindsight and little else. Both in the discovery of what is unknown, and in the propagation of that which has been proved, there is a time-differential, which ought to, in a much greater degree than it ever has, occupy the political philosopher. We have begun, chiefly under the inspiration of Mr. Graham Wallas, to examine the effect of an invisible environment upon our opinions. We do not, as yet, understand, except a little by rule of thumb, the element of time in politics, though it bears most directly upon the practicability of any constructive proposal. We can see, for example, that somehow the relevancy of any plan depends upon the length of time the