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, for purposes of re-construction insufficient. To maintain the old order under changed circumstances may be, in fact, to initiate a revolution. It was so in the seventeenth century. Pym and his followers could find justification for their contentions in our constitutional history, but to do so they had to go behind both the Stuarts and the Tudors; and to apply the principles of the fourteenth and fifteenth centuries in 1640 was, in effect, to institute a revolution. In our own time, to maintain the right of the Commons against the Lords is, on the face of it, to adhere to old constitutional right, but to do so under the new circumstances which have made the Commons representative of the nation as a whole is, in reality, to establish democracy for the first time on a firm footing, and this, again, is to accomplish a revolution.

Now, those who effect a revolution ought to know whither they are leading the world. They have need of a social theory—and in point of fact the more thorough-going apostles of movement always have such a theory; and though, as we have remarked, the theory emerges from the practical needs which they feel, and is therefore apt to invest ideas of