ideas,--actually existed, and in what consist their nature and power. As one word may become the general exponent of many, so by association a simple image may represent a whole class. But in truth Hobbes himself makes no claims to any discovery, and introduces this law of association, or (in his own language) discursion of mind, as an admitted fact, in the solution alone of which, and this by causes purely physiological, he arrogates any originality. His system is briefly this; whenever the senses are impinged on by external objects, whether by the rays of light reflected from them, or by effluxes of their finer particles, there results a correspondent motion of the innermost and subtlest organs. This motion constitutes a representation, and there remains an impression of the same, or a certain disposition to repeat the same motion. Whenever we feel several objects at the same time, the impressions that are left, (or in the language of Mr. Hume, the ideas,)[24] are linked together. Whenever therefore any one of the movements, which constitute a complex impression, is renewed through the senses, the others succeed mechanically. It follows of necessity, therefore, that Hobbes, as well as Hartley and all others who derive association from the connection and interdependence of the supposed matter, the movements of which constitute our thoughts, must have reduced all its forms to the one law of Time. But even the merit of announcing this law with philosophic precision cannot be fairly conceded to him. For the objects of any two ideas need not have co-existed in the same sensation in order to become mutually associable. The same result will follow when one only of the two ideas has been represented by the senses, and the other by the memory.