 The initial stock of known entities with which Russell proposes to carry out this grand project of logical construction seems frightfully small and strikingly non-neutral. It consists of his sensations and images—these loom large in Russell 1919, 1921—and his perceptions (percepts)—these play a prominent role in Russell 1927a, 1927b, 1948. Everything else—electrons, apples, galaxies, and selves, etc.—is in need of logical construction.