 Finally, it is obvious from his account in E 5 that Kilwardby is opposing contemporary theories of the soul of the time. In his letter to Kilwardby, soon after the Prohibitions, Peter of Conflans inquires about whether he is critical of the theory of the unity of forms (positio de unitate formarum) associated with the name of Thomas Aquinas. In the only place Kilwardby explicitly addresses the so-called theory of the unity of forms he describes it as holding that there is only one form that when it supervenes the existing composite corrupts all the existing forms and it performs by itself all the actions.