Note 47 — Chapter I · REALITY AND EXPERIENCE

The best known and most popular version of the theory is that of Locke and of a great deal of our popular science, according to which the “primary” qualities of matter, i.e. those which have to be treated as fundamental in the physical sciences, are independently real, while the rest are mere effects produced by their action on our sense-organs. The more thorough-going metaphysical doctrines of realists like Leibnitz and Herbart, being much further removed from the “naïve realism” of unreflective common sense, have never enjoyed the same currency.