Daniel moved the Log over to its customary station on a crate-top, and busied himself blotting the latest entry with sand. "Not so much a descendant as a sibling, " he said. "The father of both is the Philosophic Language, which is a system of classification of ideas. Once an idea has been enrolled or registered in the tables of the Philosophic Language, it may be addressed with a number, or a set of numbers—"