metaphysical science, not contained in such (that is, an empirical) psychology, was but a web of abstractions and generalizations. Of this prolific truth, of this great fundamental law, he declared Hobbes to have been the original discoverer, while its full application to the whole intellectual system we owed to Hartley; who stood in the same relation to Hobbes as Newton to Kepler; the law of association being that to the mind, which gravitation is to matter. Of the former clause in this assertion, as it respects the comparative merits of the ancient metaphysicians, including their commentators, the School-men, and of the modern and British and French philosophers from Hobbes to Hume, Hartley, and Condillac, this is not the place to speak. So wide indeed is the chasm between Sir James Mackintosh’s philosophical creed and mine, that so far from being able to join hands, we could scarcely make our voices intelligible to each other: and to bridge it over would require more time, skill, and power than I believe myself to possess. But the latter clause involves for the greater part a mere question of fact and history, and the accuracy of the statement is to be tried by documents rather than reasoning. First, then, I deny Hobbes’s claim in toto: for he had been anticipated by Des Cartes, whose work De Methodo, preceded Hobbes’s De Natura Humana, by more than a year. But what is of much more importance, Hobbes builds nothing on the principle which he had announced. He does not even announce it, as differing in any respect from the general laws of material motion and impact: nor was it, indeed, possible for him so to do, compatibly with his system, which was exclusively material and mechanical. Far otherwise is it with Des Cartes; greatly as he too in his after writings (and still more egregiously his followers De la Forge, and others) obscured the truth by their attempts to explain it on the theory of nervous fluids, and material configurations. But, in his interesting work, De Methodo, Des Cartes relates the circumstance which first led him to meditate on this subject, and which since then has been often noticed and employed as an instance and illustration of the law. A child who with its eyes bandaged had lost several of his fingers by amputation, continued to complain for many days successively of pains, now in this joint and now in that, of the very fingers which had been cut off. Des Cartes was led by this incident to reflect on the uncertainty with which we attribute any particular place to any inward pain or uneasiness, and proceeded after long consideration to establish it as a general law: that contemporaneous impressions, whether images or sensations, recall each other mechanically. On this principle, as a ground work, he built up the whole system of human language, as one continued process of association. He showed in what sense not only general terms, but generic images,--under the name of abstract