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54

Let us now consider what the science of logic ought to embrace.
Although whatever is true is logical whether we know it to be so or not.
Yet it is plain that logic cannot embrace all human knowledge.
The logician endeavors to assume an attitude as if, as logician, he had no information at all except what everybody must have to reason at all.
This, however, is not exactly possible.
There is no exactly defined sphere of knowledge such that every body who reasons must possess the whole of it and need know nothing else.
But the logician assumes that the