Another thing requiring the attention of the student is the mode in which these differential adjectives are generalized. As the word man, applied first to one individual, then to another, becomes associated with every individual, and every variety of the species, and calls them all up in one very complex idea; so are these adjectives applied to one class after another, and by that means at last call up a very complicated idea. Let us take the word "black" for an example; and let us suppose that we apply this adjective first to the word man. We say "black man." But we speedily see that for the same reason for which we say black man we may say black horse, black cow, {297} black coat, and so on. The word black is thus associated with innumerable modifications of the sensation black. By frequent repetition, and the gradual strengthening of the association, these modifications are at last called up in such rapid succession that they appear commingled, and no longer many ideas, but one. Black is therefore no longer an individual but a general name. It marks not the particular black of a particular individual; but the black of every individual, and of all individuals.[81] The same is the case {298} with all other words of the same class. Thus I apply the word sweet, first to the lump of sugar in my mouth, next to honey, next to grapes, and so on. It thus becomes associated with numerous modifications of the sensation sweet; and when the association is sufficiently strengthened by repetition, calls them up in such close succession, that they are converted into one complex idea. We are also to remember, that the idea and the name have a mutual power over one another. As the word black calls up the complex idea, so every modification of black calls up the name; and in this, as in other cases, the name actually forms a part of the complex idea.