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| Paragraph 1 |
We have already explained how essential nature is set out in the
terms of a demonstration, and the sense in which it is or is not
demonstrable or definable; |
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Now of the attributes which inhere always in each several thing
there are some which are wider in extent than it but not wider than
its genus (by attributes of wider extent mean all such as are
universal attributes of each several subject, but in their
application
are not confined to that subject). |
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The author of a hand-book on a subject that is a generic whole
should divide the genus into its first infimae species-number e.g.
into triad and dyad - and then endeavour to seize their definitions by
the method we have described - the definition, for example, of
straight line or circle or right angle. |
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Divisions according to differentiae are a useful accessory to this
method. |
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To define and divide one need not know the whole of existence. |
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In establishing a definition by division one should keep three
objects in view: |
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To resume our account of the right method of investigation: |
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created 1996/11/25 modified 2009/04/26