 He strongly referred in his work to the importance of Roman Codification.Zachariae edited with Karl Joseph Mittermaier the "Kritische Zeitschrift für Rechtswissenschaft und Gesetzgebung des Auslandes", and the introduction which he wrote illustrates his wide reading and his constant desire for new light upon old problems.Though Zachariae's works have been superseded, they were in their day epoch-making, and they have been superseded by books which, without them, could not have been written.