However, by 1898 he had privately acknowledged to his friend and colleague Wilhelm Fliess that he no longer believed in his theory, though he did not state this publicly until 1906.
اما در سال ۱۸۹۸ توسط او به صورت خصوصی به اذعان دوست و همکار ویلهلم Fliess که او دیگر معتقد نظریه خود را هر چند او نیست دولت این publicly تا 1906.