58 THE AMERICAN JOURNAL OF SOCIOLOGY
is possible. After repeated attempts at reconstruction of the social order which have failed, it is the easiest thing to copy the old institutions, and this is often the only successful means of restoring social stability. Hence the reversion to pre- revolutionary conditions. But, in the nature of things, such a reaction is usually only temporary. The population has learned that the social order can be changed, and at some later time is quite sure to attempt it again.
If the theory of revolutions here outlined is in any degree correct, it is evident that they are regular phenomena conform- ing to the laws of the mental life. It is possible, therefore, to pre- dict their occurrence in the sense that the conditions favorable to their development can be stated. This has already been done in the discussion of our theory, but it may be worth our while to consider these conditions more critically, in order to see how far social prevision is possible in this matter and in social science in general.
It is evident that, according to our theory, revolution is impossible in a perfectly flexible and adaptable type of social organization. On the other hand, revolution is inevitable, bar- ring foreign conquest, in those types of social and political organ- ization which do not change with changing life-conditions. Thus from a purely theoretical point of view everything seems clear. But when we apply these principles to concrete societies, we experience difficulties. It is easy to predict, in the case of extremely inflexible societies like China and Russia, that revo- lution is, sooner or later, inevitable, unless conditions greatly change. Even in this easiest instance, however, our foresight is qualified by a great "if." But we cannot say with even as much assurance that our democratic societies are free from the danger of revolution. They may have the forms of freedom without the substance. Our own American society, for example, may be relatively inflexible in certain matters which are of vital importance to the life of our group. A tyrannical public senti- ment or class interest may induce even in a democracy such an inflexibility or stagnation in institutions that only a revolution can sweep away the obstructing social structure. This is what
