Similar illustrations might be drawn from any of the other departments of conceptual evolution, because everywhere such evolution essentially consists in the achievement of ideal integrations further and further removed from simple perceptions. Or, as Sir W. Hamilton puts it, “by a first generalization we have obtained a number of classes of resembling individuals. But these classes we can compare together, observe their similarities, abstract from their differences, and bestow on their common circumstance a common name. On the second classes we can again perform the same operation, and thus, ascending through the scale of general notions, throwing out of view always a greater number of differences, and seizing always on fewer similarities in the formation of our classes, we arrive at length at the limit of our ascent in the notion of being or existence.”[54] Now, the point on which I wish to be perfectly clear about is, that this process of conceptual ideation, whereby ideas become general, must be carefully distinguished from the processes of receptual ideation, whereby ideas become generic. For these latter processes consist in particular ideas, which are given immediately in sense perception, becoming by association of similarity or contiguity automatically fused together; so that out of a number of such associated percepts there is formed a recept, without the need of any intentional co-operation of the mind in the matter. On the other hand, a general idea, or concept, can only be formed by the mind itself intentionally classifying its recepts known as such—or, in the case of creating “higher concepts,” performing the same process with its already acquired general ideas, for the purpose of constructing ideas still more general. A generic idea, then, is generalized in the sense that a naturalist speaks of a lowly organism as generalized—_i.e._ as not yet differentiated into the groups of higher and more specialized structures that subsequently emanate therefrom. But a general idea is generalized in the sense of comprising a group of such higher and more specialized structures, already formed and named under a common designation with reference to their points of resemblance. Classification there is in all cases; but in the receptual order it is automatic, while in the conceptual order it is introspective. * * * * * So far as my analysis has hitherto gone, I do not anticipate criticism or dissent from any psychologist, to whatever school he may belong. But there is one matter of subordinate importance which I may here most conveniently dispose of, although my views with regard to it may not meet with universal assent.