The second factor is the immense development of local government. It seemed to Rousseau that, in the nation-state, all authority must necessarily pass, as it had in France, to the central power. Devolution was hardly dreamed of; and Rousseau saw the only means of securing effective popular government in a federal system, starting from the small unit as Sovereign. The nineteenth century has proved the falsehood of much of his theory of government; but there are still many wise comments and fruitful suggestions to be found in the third book of the Social Contract and in the treatise on the Government of Poland , as well as in his adaptation and criticism of the Polysynodie of the Abbé de Saint-Pierre , a scheme of local government for France, born out of its due time.