 Anderson distinguished idealism’s substance-attribute logic that had been condemned by Russell from his own subject-predicate logic. Nonetheless, his Aristotelian logic of everyday experience did seem to sit uneasily with the broader search for logics that could more adequately capture forms of reasoning across a wide variety of domains. Ontological logics like Anderson’s came to seem “naively realistic and Aristotelian”, and “hard to hang on to” in the history of twentieth century philosophy (Rorty 1986). It is not just that 20th century philosophy’s “counter-intuitive redescription and relativisation to choice of primitives” (Rorty 1986) ignored Anderson’s insistence that logic is not a calculus. Technical developments in the logic of modal, tense and relational terms proceeded without reference to Anderson’s form of onto-logic.