 A philosopher of Ryle’s ilk is interested in the informal logic of the employment of expressions; the nature of the logical force that expressions have as components of theories and as pivots of concrete arguments. That is why, he says, in our discussions we argue with expressions and about those expressions in one and the same breath. We are trying to register what we are exhibiting; to codify the very logical codes which we are then and there observing (1953, 318).