 He arrived in Toblach on 7 September, exhausted and hoarse.Concerned by Frederick's lack of visible improvement after a brief meeting with Frederick in Munich, Philipp, Prince of Eulenburg, consulted the distinguished laryngologist Max Joseph Oertel, who urged a drastic and thorough operation on Frederick's throat, and said he suspected a benign tumour which could soon become malignant.By this time, Mackenzie's treatment of Frederick was generating strong criticism.