His essential point is this: Novels and short stories succeed or fail according to their capacity (a capacity that has progressed over the centuries rather like the march of science) to represent, affectingly and credibly, the actual workings of the human mind as it interacts with the real world. The mind and the world, as Wood defines them, are dependable, fixed phenomena, for the most part, possessed of natural, intrinsic qualities that fiction writers in their ink-stained lab coats measure, prod, explore and seek to illustrate using a rather limited range of instruments that can be endlessly adjusted.