The principal part of the artifice of Naming is now explained. We have considered the nature of the more necessary marks, and the manner in which they are combined so as to represent the order of a train. Beside those marks, which are the fundamental part of language, there are several classes of auxiliary words or marks, the use of which is, to abbreviate expression, and to render it, what is of great importance, a more rapid vehicle of thought. These are usually comprehended under the titles of pronoun, adverb, preposition, and conjunction; a classification which, for our present purpose, has the best recommendation, that of being familiarly known. It is to be distinctly understood, that in the account which is here to be given of the subsidiary parts of speech, it is but one part of the explanation of them which will be attempted. The ideas, which many of them stand for, are of the most complicated kind, and have not yet been expounded. We are, therefore, not yet prepared to point out the items which they mark. Our present business is only to indicate the mode in which they are used in Predication, as part of the great contrivance for marking the order of a train of ideas, and for economizing the number of words. It is also necessary to observe, that I have limited myself, in this part, to brief indications, without {195} going into minute development, the length of which, it appeared to me, would not be compensated by the advantage. In all speech *there is a _speaker_; there is some _person spoken to_; and there is some _person_ or _thing spoken of_. These objects constitute three Classes, marks of which are perpetually required. Any artifice, therefore, to abridge the use of marks, of such frequent recurrence, was highly to be desired. One expedient offered itself obviously, as likely to prove of the highest utility. Speakers constituted one class, with numerous names; persons spoken to, a second class; persons and things spoken of, a third. A generical name might be invented for each class; a name, which would include all of a class, and which singly might be used as the substitute of many. For this end were the Personal Pronouns invented and such is their character and office. "I," is the generical mark which includes all marks of the class, _speakers_. "Thou," is a generical mark, which includes all marks of the class, _persons spoken to_. "He," "she," "it," are marks, which include all marks of the class, _persons_ or _things spoken of_.