Now, then, let the word, man, be supposed, first of all, the name of an individual; it becomes associated with the idea of the individual, and acquires the power of calling up that idea. Let us next suppose it applied to one other individual, and no more: it becomes associated with this other idea; and it now has the power of calling up either. The following is, then, a very natural train:-- 1, The name occurs; 2, the name {268} suggests the idea of one of the individuals; 3, that idea suggests the name back again; 4, the name suggests the idea of the second individual. All this may pass, and, after sufficient repetition, does pass, with the rapidity of lightning. Suppose, now, that the name is associated, with the ideas not of two individuals, but of many; the same train may go on; the name exciting the idea of one individual, that idea the name, the name another individual, and so on, to an indefinite extent; all in that small portion of time of which the mind takes no account. The combination thus formed stands in need of a name. And the name, man, while it is the name of every individual included in the process, is also the name of the whole combination; that is, of a very complex idea. One other question, respecting classification, may still seem to require solution; namely, what it is by which we are determined in placing such and such things together in a class in preference to others; what, in other words, is the principle of Classification? I answer, that, as it is for the purpose of naming, of naming with greater facility, that we form classes at all; so it is in furtherance of that same facility that such and such things only are included in one class, such and such in another. Experience teaches what sort of grouping answers the purposes of naming best; under the suggestions of that experience, the application of a general word is tacitly and without much of reflection regulated; and by this process, and no other, it is, that Classification is performed. It is the aggregation of an indefinite number of individuals, by their association with a particular name. It may seem that this answer is still very general {269} and that to make the explanation sufficient, the suggestions by which experience recommends this or that classification should be particularized. For the purpose of the present chapter, however, namely, to shew that the business of Classification is merely a process of naming, and is all resolvable into association, the observation, though general, is full and satisfactory. The detail of the purposes to be answered by general terms belongs more properly to the next head of Discourse, and as far as the development of the mental phenomena seems to require it, will there be presented.