A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. I
John Stuart Mill · en
To correspond with this alteration in the form of the syllogisms, the
axioms on which the syllogistic process is founded must undergo a
corresponding transformation. In this altered phraseology, both those
axioms may be brought under one general expression; namely, that
whatever has any mark, has that which it is a mark of. Or, when the
minor premise as well as the major is universal, we may state it thus:
Whatever is a mark of any mark, is a mark of that which this last is a
mark of. To trace the identity of these axioms with those previously
laid down, may be left to the intelligent reader. We shall find, as we
proceed, the great convenience of the phraseology into which we have
last thrown them, and which is better adapted than any I am acquainted
with, to express with precision and force what is aimed at, and actually
accomplished, in every case of the ascertainment of a truth by
ratiocination.
CHAPTER III.
OF THE FUNCTIONS AND LOGICAL VALUE OF THE SYLLOGISM.
§ 1. We have shown what is the real nature of the truths with which the
Syllogism is conversant, in contradistinction to the more superficial
manner in which their import is conceived in the common theory; and what
are the fundamental axioms on which its probative force or
conclusiveness depends. We have now to inquire, whether the syllogistic
process, that of reasoning from generals to particulars, is, or is not,
a process of inference; a progress from the known to the unknown: a
means of coming to a knowledge of something which we did not know
before.