2. A higher class of ideas, which by universal consent are also common to animals and men; namely, those which Locke called Complex, Compound, or Mixed. These are something more than the simple memories of particular perceptions; they are generated by the mixture of such memories, and therefore represent a compound, of which “particular ideas” are the elements or ingredients. By the laws of association, particular ideas which either resemble one another in themselves, or frequently occur together in experience, tend to coalesce and blend into one: as in a “composite photograph” the sensitive plate is able to unite many more or less similar images into a single picture, so the sensitive tablet of the mind is able to make of many simple or particular ideas, a complex, a compound, or, as I have called it, a _generic_ idea. Now, a generic idea of this kind differs from what is ordinarily called a general idea (which we will consider in the next paragraph), in that, although both are generated out of simpler elementary constituents, the former are thus generated as it were spontaneously or anatomically by the principles of merely perceptual association, while the latter can only be produced by a consciously intentional operation of the mind upon the materials of its own ideation, known as such. This operation is what psychologists term conception, and the product of it they term a concept. Hence we see that between the region of percepts and those of concepts there lies a large intermediate territory, which is occupied by what I have called generic ideas, or _recepts_. A recept, then, differs from a percept in that it is a compound of mental representations, involving an orderly grouping of simpler images in accordance with past experience; while it differs from a concept in that this orderly grouping is due to an unintentional or automatic activity on the part of the percipient mind. A recept, or generic idea, is _imparted to_ the mind by the external “logic of events;” while a general idea, or concept, is _framed by_ the mind consciously working to a higher elaboration of its own ideas. In short, a recept is _received_, while a concept is _conceived_.