But this measured and numerous flow of language is never to be continued too long, I will not say in the peroration, (of which the hearer himself will always be a capable judge) but in any other part of a discourse: for, except in the cases above-mentioned, in which I have shewn it is allowable, our style must be wholly confined to those clauses or divisions which we erroneously call _incisa_ and _membra_; but the Greeks, with more propriety, the _comma_ and _colon_ [Footnote: The ancients apply these terms to the sense, and not to any points of distinction. A very short member, whether simple or compound, with them is a _comma_; and a longer, a _colon_; for they have no such term as a _semicolon_. Besides, they call a very short sentence, whether simple or compound, a _comma_; and one of somewhat a greater length, a _colon_. And therefore, if a person expressed himself either of these ways, in any considerable number of sentences together, he was said to speak by _commas_, or _colons_. But a sentence containing more words than will consist with either of these terms, they call a simple _period_; the least compound period with them requiring the length of two colons. Ward's Rhetoric, volume 1st, page 344.]. For it is impossible that the names of things should be rightly applied, when the things themselves are not sufficiently understood: and as we often make use of metaphorical terms, either for the sake of ornament, or to supply the place of proper ones, so in other arts, when we have occasion to mention any thing which (through our unacquaintance with it) has not yet received a name, we are obliged either to invent a new one, or to borrow it from something similar. We shall soon consider what it is to speak in _commas_ and _colons_, and the proper method of doing it: but we must first attend to the various numbers by which the cadence of our periods should be diversified.