In all these instances he has seen
the major and minor terms and then grasped the causes, the middle
terms.
Let A represent 'bright side turned sunward', B 'lighted from the
sun', C the moon. Then B, 'lighted from the sun' is predicable of C,
the moon, and A, 'having her bright side towards the source of her
light', is predicable of B. So A is predicable of C through B.
Book II
1
THE kinds of question we ask are as many as the kinds of things
which we know. They are in fact four:-(1) whether the connexion of
an attribute with a thing is a fact, (2) what is the reason of the
connexion, (3) whether a thing exists, (4) What is the nature of the
thing. Thus, when our question concerns a complex of thing and
attribute and we ask whether the thing is thus or otherwise
qualified-whether, e.g. the sun suffers eclipse or not-then we are
asking as to the fact of a connexion. That our inquiry ceases with the
discovery that the sun does suffer eclipse is an indication of this;
and if we know from the start that the sun suffers eclipse, we do
not inquire whether it does so or not.
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