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meaning of language is well-known between himself and the person to whom his is imparting his doctrin, although that meaning may not be anlayzed and all its elements distinctly recognized, but that no other facts are known.
Of course, some others must be known; but they are left out of account.

The ultimate purpose of the logician is to make out the theory of how knowledge is advanced.
Just as there is a chemical theory of dyeing which is not exactly the act of syeing, and there is a theory of thermodynamics which is quite different from the art of constructory heat-equiries, so