60

G60

suppose that among the half dozen predictions to which that method
will carry him, there, quite unexpectedly, turns up one whose truth
has long been known to him, though it is a surprise to him to find
that it is deducible from the hypothesis under examination. What
course does sound logic impose upon him under these circumstances?

The answer is that he must reexamine the process of retroduction
that suggested the hypothesis; and if the fact that is now repredicted
in any degree influenced that hypothesis, it has had its
due effect, and must not be used again. But if not, will he then