Then it is clear in virtue of what
character B inheres in D-namely A-and that it inheres in C and E for
the same reason: and throughout the remaining subgenera always the
same rule applies.
We are now taking our examples from the traditional class-names, but
we must not confine ourselves to considering these. We must collect
any other common character which we observe, and then consider with
what species it is connected and what.properties belong to it. For
example, as the common properties of horned animals we collect the
possession of a third stomach and only one row of teeth. Then since it
is clear in virtue of what character they possess these
attributes-namely their horned character-the next question is, to what
species does the possession of horns attach?
Yet a further method of selection is by analogy: for we cannot
find a single identical name to give to a squid's pounce, a fish's
spine, and an animal's bone, although these too possess common
properties as if there were a single osseous nature.
15
Some connexions that require proof are identical in that they
possess an identical 'middle' e.
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