Aristotle - The Organon - index for TOPICA Book 4 Part 4

Things that bear a like relation to one another

Paragraph 1 Again, consider the case of things that bear a like relation to one another.
Paragraph 2 If the opposite of the species be a privation, there are two ways of demolishing an argument, first of all by looking to see if the opposite be found in the genus rendered:
Paragraph 3 Again, look at the negations of the genus and species and convert the order of terms, according to the method described in the case of Accident:
Paragraph 4 If the species be a relative term, see whether the genus be a relative term as well:
Paragraph 5 Moreover, see whether the term fail to be used in the same relation both when called by the name of its genus, and also when called by those of all the genera of its genus.
Paragraph 6 Again, see whether the genus and the species be used in the same way in respect of the inflexions they take, e.g. datives and genitives and all the rest.
Paragraph 7 Again, see whether terms used in like case relationships fail to yield a like construction when converted, as do 'double' and 'multiple'.
Paragraph 8 Again, see whether the species and the genus fail to be used in relation to an equal number of things:
Paragraph 9 See, also, if the opposite of the species have the opposite of the genus as its genus, e.g. whether, if 'multiple' be the genus of 'double', 'fraction' be also the genus of 'half'.
Paragraph 10 Seeing that of relative terms some are of necessity found in, or used of, the things in relation to which they happen at any time to be used (e.g. 'disposition' and 'state' and 'balance';

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