Page:The Distinction between Mind and Its Objects.djvu/74

 and we see the vraisemblance of the new rule which is to support the logical priority of the premisses. Without a formal break in the deduction, without an assignable falsity in any premiss, we may have got from a region of self-evidence—say of arithmetical truth—to one of questionable results in any concrete science. And we may express our sense of what has befallen us in the extraordinary statement that the falsity of Conclusions in such a deduction would not involve the falsity of the Premisses—and so the truth of the Premisses does not involve the truth of the Conclusion. We must be testing the Conclusion by the ideal of science, and the later Premisses only by the standard of empirical fact. Bare Conjunction is thus introduced into the very nerve of inference, and not merely made the object of a precaution, as in the traditional