This study is an attempt to show that concurrently with the liberal type of democracy there emerged from the same premises in the eighteenth century a trend towards what we propose to call the totalitarian type of democracy. These two currents have existed side by side ever since the eighteenth century. The tension between them has constituted an important chapter in modern history, and has now become the most vital issue of our time. It would of course be an exaggeration to suggest that the whole of the period can be summed up in terms of this conflict. Nevertheless it was always present, although usually confused and obscured by other issues, which may have seemed clearer to contemporaries, but viewed from the standpoint of the present day seem incidental and even trivial. Indeed, from the vantage point of the mid-twentieth century the history of the last hundred and fifty years looks like a systematic preparation for the headlong collision between empirical and liberal democracy on the one hand, and totalitarian Messianic democracy on the other, in which the world crisis of to-day consists.