Rarely has the incapacity of governments to hold up the course of history been more conclusively demonstrated than in the generation after 1815. To prevent a second French Revolution, or the even worse catastrophe of a general European revolution on the French model, was the supreme object of all the powers which had just spent more than twenty years in defeating the first; even of the British, who were not in sympathy with the reactionary absolutism which re-established themselves all over Europe and knew quite well that reforms neither could nor ought to be avoided, but who feared a new Franco-Jacobin expansion more than any other international contingency. And yet, never in European history and rarely anywhere else has revolutionarism been so endemic, so general, so likely to spread by spontaneous contagion as well as by deliberate propaganda.