Chapter 54
Metaphysics," "The Distinction between Appearance and Reality" and "The Significance of the Distinction."
Section 22. See Chapter XXVI, "The World as Unperceived, and the 'Unknowable,'" where Spencer's doctrine is examined at length, and references are given. I think it is very important that the student should realize that the "Unknowable" is a perfectly useless assumption in philosophy, and can serve no purpose whatever.