^{page 240 note 1} In this context reference should have been made to Urban II's advice: Loewenfeld, S., Epistolae Pontificum Romanorum ineditae, Leipzig 1885, 61 no. 126Google Scholar. It might have been helpful if a comparison had been made with Bonizo's method; cf. Lewald, Ursula, An der Schwelle der Scholastik: Bonizo von Sutri & das Kirchenrecht seiner Tage, Weimar 1938Google Scholar; also Reinke, A., Die Schuldialektik im Investiturstreit, Stuttgart, 1937Google Scholar.

^{page 241 note 1} This is noteworthy in view of the recent findings by Ryan, J. J., S. Peter Damian and his canonical sources, Toronto 1956Google Scholar, who shows that Pseudo-Isidore was not used by Peter Damian either.