Extension, which we _may_ make, and which will be true if
the former is true.'

From the lucid explanation here cited (and from a following paragraph
too long to describe p. 433), we see that there is no real distinction
between Judgments in Comprehension and Judgments in Extension; that the
_appearance_ of distinction between them arises from the customary mode
of enunciation, which custom is here accounted for; that the addition to
the theory of the Syllogism, for which Sir W. Hamilton takes credit, is
alike troublesome and unprofitable.

The like may also be said about his other innovation, the Quantification
of the Predicate. Still more extensive are the changes (as stated by
himself) which this innovation would introduce in the canons of
Syllogism. Indeed, when we read his language (Appendix to 'Lectures on
Logic,' pp. 291--297) censuring generally the prior logicians from
Aristotle downwards, and contending that 'more than half the value of
logic had been lost' by their manner of handling it--we may appreciate
the magnitude of the reform which he believed himself to be introducing.
The larger the reform, the more it behoved him to be sure of the ground
on which he was proceeding. But on this point we remark a serious
deficiency. After laying down, with appropriate emphasis, the valuable
logical postulate, _to state explicitly what is thought implicitly_, on
which, Sir W. Hamilton says,

'Logic ever insists, but which logicians have never fairly
obeyed--it follows that logically we ought to take into
account the quantity, _always understood in thought_, but
usually, and for manifest reasons, elided in expression, not
only of the _subject_, but also of the _predicate_, of a