The mood of this argument is
A
A
A in the second figure. No negatives; no particulars. “A” distributes its subject only; the middle term is thus undistributed. The argument is invalid, the fallacy being that of undistributed middle.
(2) “No one but a thief would take these books without asking for them, and it has been proved that you took the books; that is the reason I have called you a thief.”
It is clear that “no one but” is equivalent to “only.” Thus the first proposition of the argument is an exclusive, and may be made logical by interchanging subject and predicate and calling it an “A.” As a result of this the argument takes the following form:
A (All) These M
books were taken by a G
thief,
A S
You took these M
books,
A ∴ S
You are a G
thief.
We have now had sufficient experience to recognize the validity of mood AAA in the first figure.
(3) “None but the brave deserve the fair,