Chapter XXII: Book III: Of Induction

“According to the doctrine now stated, the highest, or rather the
only proper object of physics, is to ascertain those established
conjunctions of successive events, which constitute the order of
the universe; to record the phenomena which it exhibits to our
observations, or which it discloses to our experiments; and to
refer these phenomena to their general laws.”—D. STEWART,
_Elements of the Philosophy of the Human Mind_, vol. ii., chap.
iv., sect. 1.

“In such cases the inductive and deductive methods of inquiry may
be said to go hand in hand, the one verifying the conclusions
deduced by the other; and the combination of experiment and
theory, which may thus be brought to bear in such cases, forms an
engine of discovery infinitely more powerful than either taken
separately. This state of any department of science is perhaps of
all others the most interesting, and that which promises the most
to research.”—SIR J. HERSCHEL, _Discourse on the Study of Natural
Philosophy_.