greater.

So it is with every other relative term; but the case we use to express
the correlation differs in some instances. Thus, by knowledge we mean
knowledge the knowable; by the knowable, that which is to be
apprehended by knowledge; by perception, perception of the perceptible;
by the perceptible, that which is apprehended by perception.

Sometimes, however, reciprocity of correlation does not appear to
exist. This comes about when a blunder is made, and that to which the
relative is related is not accurately stated. If a man states that a
wing is necessarily relative to a bird, the connexion between these two
will not be reciprocal, for it will not be possible to say that a bird
is a bird by reason of its wings. The reason is that the original
statement was inaccurate, for the wing is not said to be relative to
the bird qua bird, since many creatures besides birds have wings, but
qua winged creature. If, then, the statement is made accurate, the
connexion will be reciprocal, for we can speak of a wing, having
reference necessarily to a winged creature, and of a winged creature as
being such because of its wings.

Occasionally, perhaps, it is necessary to coin words, if no word exists
by which a correlation can adequately be explained. If we define a
rudder as necessarily having reference to a boat, our definition will
not be appropriate, for the rudder does not have this reference to a
boat qua boat, as there are boats which have no rudders. Thus we cannot
use the terms reciprocally, for the word 'boat' cannot be said to find
its explanation in the word 'rudder'. As there is no existing word, our
definition would perhaps be more accurate if we coined some word like
'ruddered' as the correlative of 'rudder'. If we express ourselves thus
accurately, at any rate the terms are reciprocally connected, for the
'ruddered' thing is 'ruddered' in virtue of its rudder. So it is in all
other cases. A head will be more accurately defined as the correlative
of that which is 'headed', than as that of an animal, for the animal
does not have a head qua animal, since many animals have no head.

Thus we may perhaps most easily comprehend that to which a thing is
related, when a name does not exist, if, from that which has a name, we
derive a new name, and apply it to that with which the first is
reciprocally connected, as in the aforesaid instances, when we derived
the word 'winged' from 'wing' and from 'rudder'.

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