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doubt of the accuracy of his norm.
In that case, he will naturally try to see whether he cannot imagine a state of things in which analygous premisses would be true and yet no such inference be justified.
If he is a highly skilled logician he will know how to conduct this business so as to leave no more room for doubt than there is for doubting the multiplication-table.

If you accept this statement of the phenomena of reasoning, you cannot fail to be struck with the manner in which the defendent-argument, as we agreed to call it, confound together the norms, which are general mental formulations, with the logical dispositions, which are efficient agencies, and having identified these twi regards them both as a mere quality of feeling, the "logisches Gefuhl", a they call it.