the revolutionaries get the upper hand, he will have to sacrifice one of his principles: he will have to side against either the actual or the legitimate Sovereign. It is easy also to see that alienation of liberty, even if possible for an individual, which Rousseau denies, cannot bind his posterity. But, with all its faults, the view of Hobbes is on the whole admirably, if ruthlessly, logical, and to it Rousseau owes a great deal. The special shape given to the second Social Contract theory by Hobbes looks, at first sight, much like a combination, into a single act, of both the contracts. This, however, is not the view he adopts. The theory of a contract between government and people had, as we have seen, been used mainly as a support for popular liberties, a means of assertion against the government. Hobbes, whose whole aim is to make his government Sovereign, can only do this by leaving the government outside the contract: he thus avoids the necessity of submitting it to any obligation whatsoever, and leaves it absolute and irresponsible. He secures, in fact, not merely a State which has unbounded rights against the individual, but a determinate authority with the right to enforce those rights. His theory is not merely Statism (_étatisme_); it is pure despotism. It is clear that, if such a theory is to be upheld, it can stand only by the view, which Hobbes shares with Grotius, that a man can alienate not merely his own liberty, but also that of his descendants, and that, consequently, a people as a whole can do the same. This is the point at which both Locke and Rousseau attack it. Locke, whose aim is largely to justify the Revolution of 1688, makes government depend, not merely at its institution, but always, on the consent of the governed, and regards all rulers as liable to be displaced if they govern tyrannically. He omits, however, to provide any machinery short of revolution for the expression of popular opinion, and, on the whole, seems to regard the popular consent as something essentially tacit and assumed. He regards the State as existing mainly to protect life and property, and is, in all his assertions of popular rights, so cautious as to reduce them almost to nothing. It is not till we come to Rousseau that the second form of the contract theory is stated in its purest and most logical form.