ARISTOTLE AND THE EARLIER PERIPATETICS vol.I by Eduard Zeller, B.F.C.Costelloe 1897

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LOGIC 273
why the sciences are not all one, is just because each
class of actual existences has its own peculiar sort of
knowledge which applies to it. 1 If it be true that
among the sciences we find one which is a science of
first principles—the ' First Philosophy '—we must not
expect it to develop its subject-matter out of any single
principle of being. On the contrary, we shall find it
necessary, before proceeding to any further researches,
that we should inquire into all the most general points
of view from which the world of actual
existence can
be considered, or, in other words, enumerate the highest
generic concepts themselves.
This it is with which the doctrine of the Categories
is concerned, and these
form accordingly the true connecting
link, in Aristotle's philosophic system, between
Logic and Metaphysics.
Anvrn., Anal. Pri. i. 46, 61, b, 22,
and Bliet. iii. 6 fin. That which
cannot be deduced from any
other thing (the highest principles),
must be explained by analogy,
as, for example, the concepts
of Matter, of T?orm, &c. ; cf . Metaph.
ix. 6 (vid. sup. p. 269, n. 1);
xii. 4, 1070, b, 16 sqq., and Phys.
i. 7, 1 91 , a, 7. This is the account
given by Trendelenburg in
his Hist, lieitr. i. 151 sqq. Analogy
' is of special importance ' to
Aristotle in his study of Natural
History; see thereon infra, and
cf. Meter, Arist. Thierhunde,
334 sqq.
1
Anal. Post. i. 28 init. : p-la
ft eiriar'tjfjir] effrlv t) lv6s yevovs . . .
eTe'pct 8' imffT^liri tffr\v irepas,
'ifftap at apxal fifo' e/c ruf aiiruv
pA\& erepai etc tuv erepav. Metaph.
iii. 2, 997, a, 21 : irep* oSv t