The first quality we know in matter is centrality,--we call it gravity,--which holds the universe together, which remains pure and indestructible in each mote, as in masses and planets, and from each atom rays out illimitable influence. To this material essence answers Truth, in the intellectual world,--Truth, whose centre is everywhere, and its circumference nowhere, whose existence we cannot disimagine,--the soundness and health of things, against which no blow can be struck but it recoils on the striker,--Truth, on whose side we always heartily are. And the first measure of a mind is its centrality, its capacity of truth, and its adhesion to it. When the correlation of the sciences was announced by Oersted and his colleagues, it was no surprise; we were found already prepared for it. The fact stated accorded with the auguries or divinations of the human mind. Thus, if we should analyze Newton's discovery, we should say that if it had not been anticipated by him, it would not have been found. We are told that, in posting his books, after the French had measured on the earth a degree of the meridian, when he saw that his theoretic results were approximating that empirical one, his hand shook, the figures danced, and he was so agitated that he was forced to call in an assistant to finish the computation. Why agitated?--but because, when he saw, in the fall of an apple to the ground, the fall of the earth to the sun, of the sun and of all suns to the centre, that perception was accompanied by the spasm of delight by which the intellect greets a fact more immense still, a fact really universal,--holding in intellect as in matter, in morals as in intellect,--that atom draws to atom throughout nature, and truth to truth throughout spirit? His law was only a particular of the more universal law of centrality. Every law in nature, as gravity, centripetence, repulsion, polarity, undulation, has a counterpart in the intellect. The laws above are sisters of the laws below. Shall we study the mathematics of the sphere, and not its causal essence also? Nature is a fable, whose moral blazes through it. There is no use in Copernicus, if the robust periodicity of the solar system does not show its equal perfection in the mental sphere,--the periodicity, the compensatory errors, the grand reactions. I shall never believe that centrifugence and centripetence balance, unless mind heats and meliorates, as well as the surface and soil of the globe.