In this condition of philosophical and political opinion, the necessity of Order was felt to be paramount, and a long period of reaction ensued. Dating from the official Deism introduced by Robespierre, it reached its height under the aggressive system of Bonaparte, and it was feebly protracted, in spite of the peace of 1815, by his insignificant successors. The only permanent result of this period was the historical and doctrinal evidence brought forward by De Maistre and his school, of the social inutility of modern metaphysics, while at the same time their intellectual weakness was being proved by the successful attempts of Cabanis, and still more of Gall, to extend the Positive method to the highest biological questions. In all other respects this elaborate attempt to prevent the final emancipation of Humanity proved a complete failure; in fact, it led to a revival of the instinct of Progress. Strong antipathies were roused everywhere by these fruitless efforts at reconstructing a system which had become so entirely obsolete, that even those who were labouring to rebuild it no longer understood its character or the conditions of its existence. A re-awakening of the revolutionary spirit was thus inevitable; and it took place as soon as peace was established, and the chief upholder of the retrograde system had been removed. The doctrines of negation were called back to life; but very little illusion now remained as to their capacity for organizing. In want of something better, men accepted them as a means of resisting retrograde principles, just as these last had owed their apparent success to the necessity of checking the tendency to anarchy. Amidst these fresh debates on worn-out subjects, the public soon became aware that a final solution of the question had not yet arisen even in germ. It therefore concerned itself for little except the maintenance of Order and Liberty; conditions as indispensable for the free action of philosophy as for material prosperity. The whole position was most favourable for the construction of a definite solution; and it was, in fact, during the last phase of the retrograde movement that the elementary principle of a solution was furnished, by my discovery, in 1822, of the two-fold law of intellectual development. [Political stagnation between 1830 and 1848]