Arthur David Ritchie Quote
The facts of the external world stand to our scientific knowledge. Or to our commonsense knowledge (there is no difference in principle between them) much in the same relation as a library of books stands to the catalogue.
Scientific Method: An Inquiry into the Character and Validity of, Natural Law, Chapter V (p. 112), Kegan Paul, Trench, Trubner & Co., Ltd. 1923