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LOgick is an Art which conduct∣eth the mind in the knowledge of things.
In this Definition two things are to be explained.
For the first of these, Logick hath its name from this word 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, which signifieth
speech, and according to Aristotle, speech is twofold, internal, and external. Internal speech he calleth that which is conceived in the mind: And that he calleth external, which is expressed by words; now Logick hath its name from both these kinds of speech but chiefly from the internal, which is the reason or ratiocination of the mind, where∣as the external speech is but the interpreter of the internal.
This word Logick may be taken two waies.
And this definition of Logick doth bes¦sute with it in the first acceptation; though I shall here speak of it in the second; namely as it is taken for the Systeme of Logical pre∣cepts.
The parts of this definition are two, the Genus and the differentia; the Genus or ge∣neral name here given to Logick is Art not a manual art, or handy-craft trade but an internal and mental art; for the mind hath its artificial workings as well as the body, as is manifest even in Poetry.
The difference or particular name, by
which it is distinguished from other arts will be best conceived by considering three things; the End, the Offices and the Object thereof.
The last and principal end of Logick is, the knowledge of things, and its chief Offices by which this End may be attained, are these three.
And the matter or Object about which it ••reateth, is, all that we can possibly either con∣ceive in our minds, or utter with words; but the manner how this matter is to be considered, is not as things are in their own nature, but ••s the Instruments of Logick may be applied unto them.
The parts of Logick therefore are these two; Thematical and Organical.
The Thematical part is that, which treat∣eth of Theams with their various affections, and second notions, as of the matter of which Logical Instruments are composed.
The Organical part, is that, which treat∣eth of those Instruments, and their compo∣sition.